Meet ‘n’ Match – Your door opener to a job in South Westphalia

May 11th, 2021 with Lachmann & Rink GmbH in Freudenberg and Dortmund

On May 11th it will be the sixth time “Meet ‘n’ Match – your door opener to a job in South Westphalia”! Those interested in software from the following areas have come to the right place

  • Computational Science
  • Software-Development
  • Electrical engineering
  • Physics
  • Lateral entry
  • Autodidact

Because the host Lachmann & Rink GmbH with locations in Freudenberg and Dortmund has many offers for you. ➡️ Theses, student traineeships or a direct career entry!
As part of the 90-minute online format, the participants can take a look behind the scenes of the largest software service provider in South Westphalia with an industry focus and maybe even find their dream job in the region. 🕵️🔜🎉 👉
Information and registration options for the organizers:
Please register at least one day in advance so that the event can be better planned. 🙏
What to expect? At Meet ‘n’ Match, students, graduates and companies come together digitally and in a relaxed atmosphere.

🏢 Digital Companie tour
💬 Peer networking with employees
👩‍Speed-Dating-Interview (optional)

May 26th, 2020 with Infineon Technologies AG in Warstein

On May 26th it will be the seventh time “Meet ‘n’ Match – your door opener to a job in South Westphalia”! Interested parties from the following areas have come to the right place

  • Electrical engineering
  • industrial engineering
  • Physics
  • Engineering
  • Chemistry
  • Computational Science

Because the host Infineon Technologies AG at the Warstein location has many offers ready for you. ➡️Internship, thesis, working student activity or a direct career entry!
As part of the 90-minute online format, the participants can take a look behind the scenes of the largest software service provider in South Westphalia with an industry focus and maybe even find their dream job in the region. 🕵️🔜🎉 👉
Information and registration options for the organizers:
Please register at least one day in advance so that the event can be better planned. 🙏
What to expect? At Meet ‘n’ Match, students, graduates and companies come together digitally and in a relaxed atmosphere.

🏢 Digital Companie tour
💬 Peer networking with employees
👩‍Speed-Dating-Interview (optional)

Information and content do not originate from Fab Lab Siegen

Soviet hand drill repair

Pre Story

My father bought the thing at the flea market sometime. The price of 5 rubles (Ц. 5Р.) is incorporated in the handle, because at that time in the Soviet Union there was the planned economy and you could get a pack of butter for the same price in the big whole country.


The drill always did its job. It is particularly suitable for small jobs and you can dose the torque manually. Only at some point the drill got stuck somewhere and my father exerted too much momentum on the big bevel gear until a few plastic teeth sheared off, rendering the thing useless. The old bevel gear consisted of two parts: The front side with the teeth was made of a plastic casting and the back side was made of some kind of metal, which was somehow connected to the plastic (unfortunately no photo). So a new bevel gear was needed.


First, the teeth of the bevel gear had to be counted. There are 60 teeth. The driven bevel gear has 15 teeth, so there is a ratio of 1:4. In addition, all dimensions, such as the height of the teeth, their width and the bore diameter of the bevel gear had to be measured with a caliper gauge. The problem: the teeth are not simply arranged in a straight line, and their “focal point” is somewhere in the air. They are also wider at the outermost diameter than at the inner diameter of the bevel gear. So the geometry is a real challenge and you can’t just build the thing with a CAD program if you’re not a professional.
But what to do? Fortunately, I happened to come across a solidworks tutorial on the internet. It shows how to create configurable standard parts using the solidworks (SW) design library. And that worked well!


Open Solidworks, open any assembly and throw out all the parts. Somehow it didn’t work out any other way for me. Then, on the right side of the screen, open the construction library and shimmy through the tree. Toolbox, ISO, power transmission, gears, degree bevel gear (driving).


For me, the ISO standard matched well with my Soviet part. Then the “Degree bevel gear (driving)” must be dragged and dropped into the assembly window. Now the “Configure component” dialog opens on the left. The module, the number of teeth, the pressure angle, etc. can be set. Here you have to experiment, have the bevel gear with the green check mark built again and again and measure it. (Tip: If you click on a component edge, the bottom info bar of SW conveniently shows the measured length directly).


However, you cannot specify all dimensions and geometry properties in the configurator. And here’s where it gets a little tricky. If the tooth geometry of the blank created fits so far, the rest must now be added manually. I used the function “Attachment/Base rotated” to build a created sketch as a body of rotation to the blank (see screenshot). Again, I had to measure the old bevel gear over and over again.


Once you are satisfied with the part, you need to export it to *.STL format for 3D printing. And off we go to the Fab Lab Siegen! Here Fabian helped me out, showed me the 3D printers and started the printing. Thanks a lot! 😊


The first print was unsuccessful (of course). In 3D printing, for example, the holes are always slightly smaller compared to the model. The teeth were also too small, so that they could not engage deeply enough with the opposing teeth. These teeth also sheared off during initial attempts. In addition, the bracket for the crank was a bit too thin and is therefore broken off.

Gears printed

Drill machine open

But now it was possible to measure the printed bevel gear and improve the dimensions in SW and finally start a second attempt. However, the second time it went better than expected and the bevel gear installed beautifully. The hand drill runs very smoothly and if any problems should occur in a few years, I’ll just print out the bevel gear again 😉 .



A Child’s Book, or: Saving Plastic, Starting 3D Prints New

During the summer semester 2020, there was a printer in the Fab Lab that was constantly cancelled for testing. The printer with the name “Hades” had to serve as a test object for a children’s book. But what does a children’s book have to do with highly experimental, plastic-saving techniques? Let’s lunge a litte bit.

Earlier this summer semester, I decided to develop a children’s book for 3D printers. Together with my fellow student C. Ajiboye, this became a manual that tells a story on one side, one of Ursa, a girl exploring 3D printing through “Learning By Doing.” On the other side, there were explanations of how Ursa finds problems and what solutions it gives for each of them.
But the last page was special:

A WLAN-enabled (ESP32) microcontroller was embedded in this page. This one could feel touches via its touchpins. I then soldered these pins to copper surfaces and hid them under the page. One laser cut later, the copper surfaces could be seen shining through.

Thanks to these surfaces it was now possible to give commands to the ESP32. And thanks to the Octoprint servers, it was then possible to give commands to the printers. Yes, you read that right, this little book has a remote control for a 3D printer built in.

But What is the Point of All This?

Restarting a 3D print is not an easy task, so far there is not a single Octoprint plugin that dares to do this. The result is that when a print fails, which the sensors do not notice, a lot of time, sometimes days, and also up to kilos of plastic are lost. This book was intended to prevent that.

A book has many advantages: it’s quickly at hand, it’s often where you want it, and the software doesn’t change much. It is also lighter than a laptop and thus handier to use. What’s more, you don’t have to boot it up or preconfigure it. The interface is simply there.

But How do You Restart a Print With a Book Now?

A 3D print is stored in machine code. This “code” is written line by line and executed line by line afterwards. So a group of lines represents a layer, because a 3D print is done layer by layer. If a 3D print fails at one point, the commands could be executed again from this point. In the file, as well as in the real print, an exact height is defined for this. You could measure this height, but neither with the eye nor with a ruler you can find it exactly. With the 3D printer itself, on the other hand, you can find the exact height. Like calibrating old 3D prints, you can now use a piece of paper and the tip to determine to within 0.1mm where a print failed. So, with the book in your hand, you move the nozzle exactly over the pressure, lower it very slowly, and try to feel with a piece of paper placed in between when the nozzle touches the pressure.

The printer then knows exactly where this nozzle is located, if it is still referenced. Based on this height, the code is then split, the necessary initial steps are executed and then the printer prints again as if it had never stopped.

I Want This Too

After this semester I found the time to develop this project as a plugin for Octoprint. So you don’t need your own book and you can try it out in the web interface. But ATTENTION! This plugin is highly experimental and has also once caused damage to a 3D printer. I do not make any guarantees or take any responsibility for future damages and advise to always hover with your hand over the emergency switch until the first layer prints again and you are sure that the printer is working on the correct line.

Yours, Gerrit.

Welcome Freshmen!

Dear freshmen, we are glad you found your way to the University of Siegen. With us you can create crazy things! The following text was published with little changes in the ESE-paper of the GG LaBaMa in the winter terms 20/21..

Here could be a formal text describing what a Fab Lab is, what technologies you can find in our Fab Lab, what the Fab Lab has to do with a university and why actually “Fab Lab? But I think you are all able to type into your browser and find out for yourself what we have to offer as Fab Lab of the University of Siegen. That’s why I’m saving you this. Just so much: The Fab Lab is an open creative lab of the university with many different machines like 3D printers, laser cutters, CNC mills and so on. When there is not global pandemic anyone can come and do cool things.

A Brief Introduction of the Fab Lab.

The idea for this text came to me in the shower. I was wondering what of our pre-written text about the Lab I might send to the editors of the ESE newspaper to let first-year students know that the Fab Lab exists. And then I remembered a mail from “nanooq”, who announced that he will write a text for the Hasi for this newspaper. What the Hasi is is (presumably) in his text, which is also printed in this publication. Who nanooq is, you may never know. Or he suddenly appears in your life because you have set foot in the Siegen “scene”. Then: all the best! Well and because I already know nanooq a bit and also his texts and stories about the scene, a formal text about the interior design and the scientific orientation of the Fab Lab seemed a bit stale to me. The glittering hasi (yes the article is chosen correctly!) and nanooq’s wordiness will make the Fab Lab look old. So I’ll give it a try.

Often during your studies you will surely hear the question: “But why Siegen?”.
And you might get into trouble explaining: “Because it’s so beautifully green here!”, or “Because I can attend seminars about Harry Potter here…!”.
In my case, the Fab Lab (and a failed course of study) was more of a deciding factor. Because in a Fab Lab like this, you can expect not only certain machines, but also a certain kind of people. Cosmopolitan, colorful, creative, crazy intergalactic creatures.

One of the reasons why I decided to study in Siegen was that when I was visiting the university (yes, there are such nerds), I was led by the tutor of the HCI students at the time (HCI stands for Human Computer Interaction. What Human Computer Interaction stands for….well duckduckgo it yourself) was also led into a small lab, in which my current work colleague Marios sat engrossed bent over a microcontroller circuit. I was introduced to the space as the “Fab Lab”.
“You could do something like Marios is doing right now in your studies”, my tutor tried to get me. Since then, I’ve spent a lot of time in the Fab Lab, even outside of my studies, and experienced a lot. In the meantime, I even work there.

One of the trades we built in the Lab (the connoisseur only speaks of “Lab” [ˈlæb], the “Fab” is silent!) even made it into the daily news. A palm tree, made of bed slats and dryer exhaust hoses, sidewalk slabs, steel and quite a lot of light and electronics.

At one point, there were large quantities of bed slats in the Lab’s warehouse for this project. People from Siegen have a lot of slatted frames to give away for free, we took advantage of that (Attention: Insider tip). And these bed slats wanted to be sanded so that they could then be repainted with white paint. White paint reflects very well, so it’s good to shine spotlights on it. Later, the battens should be screwed into triangles. Several of these triangles of slightly bent bed slats screwed together form the skeleton of a palm leaf. It’s like that. If you then hang these leaves in a star shape on a metal trunk you get a span of 9 meters. In height, the palm tree brings it to four and a half meters.

After painstakingly disassembling the slats in the Hasi, we sanded down the extracted bed slats at the back entrance of the Lab using the most inefficient tools (orbital sander and sandpaper) we could find. Maybe the tool could have been used to sand down normal wood, but not the nasty coating those bed slat manufacturers had put on there.

People grind wooden slats

One grinds behind the laboratory.

So we’re standing at the back entrance of the Lab in the parking lot, struggling with these bed slats. A car parks next to us. A guy we don’t know gets out. Maybe 40, slight grin on his lips. As he walks from his car to our rather sad collection of mediocre “craftsmen”, he smugly calls in our direction, “Well, do you need help?!”.
We defiantly try to ignore him in frustration. All I hear nanooq saying is “No thanks, we’ll be fine”.
“I might have what you need in the trunk,” the stranger replies.
So there’s a complete stranger who happens to have what we need in the trunk. Hm, sure.
nanooq, still a bit curious, follows him and the two come back with several cutters and grinding wheels. The sanding discs we brought with us were perfect: sandpaper arranged in a circle, stacked like flaps.

It slowly dawned on me what was going on. Past me, thank you! I had asked 1-2 hours before on the off chance in the Fab Lab Telegram group if someone had suitable tools for our action. I had not expected that strangers read along and also still feel addressed. And then just load up the trunk with tools and hit our place. It’s going well. For the remaining battens, we then needed another minute per batten. It took 10 minutes. This results in a working time reduction of 90%. Henry Ford would somersault in his grave.

The finished palm tree. The painstaking work was worth it. Creative design: Simon Budig. A project by people from Hackspace Siegen and the Lab.

The man with the cutters has been in and out of the Lab regularly (if it weren’t for this damned virus) ever since. He is now “part of the community.” And that’s what the Lab is all about. The Community. People meet, exchange ideas, pass on their knowledge, teach each other new things.

Check out our Telegram group or our news channel (also Telegram). At the moment we have a limited operation until further notice, always on Wednesdays and only for university members (as well as students). Soon we will hopefully be able to open again for everyone, so you can experience live and up close what makes the magic of a Fab Lab. We’ll put that in the Telegram group, on our website, Twitter, Facebook. You know it. Until further notice our

opening hour (with regard to news about corona) apply.

A Suitcase Filled With Heart

At the beginning there is a story. A reappraisal of feeling, put into words and released into the world. “Du dunkles Herz” (“You dark Heart”) by Tobias Gruseck comes as an appealing red booklet and is a story about a suitcase full of money that darkens hearts. But promoting literature depends on more than the content of the text. A myth around it is good, maybe an eccentric author, a scandal. Or a suitcase, in it: hearts. If you touch one of the hearts, or the oak leaf next to it, you suddenly hear voices. Text passages that match the object touched resound softly and wonderfully recited from the case and make you want to listen to the story.

A story is told here with multimedia and attention to detail

Jenny and Simon took on the presentation of the work and built the suitcase. Wired inside is a touch board from Bare Conductive® that is connected via conductive yarn to things that are historically significant and, in some cases, 3D printed. Touching the thread closes the circuit and the text passages stored on the chip and previously recorded with virtuosity are played.

Literature as a haptic experience

All this was first presented in Bad Säckingen at “Kunst trifft Handwerk,” an annual outdoor event at the picturesque Trompeterschlößchen, where Germany and Switzerland bundled streams of tourists before the pandemic moved in. The title of the event also fits perfectly with this haptic project, which combines literary effusion with gifted tinkering. Currently on display at Fab Lab Siegen.

From Now On: Lab Opening for Members of The University of Siegen Every Wednesday

Dear Community,

Good news for some of you: from now on we will extend our Studi-Lab to all university members. Anyone who works or studies at the University of Siegen is allowed to come to us on Wednesdays from 10 am to 4 pm and work independently on their projects, provided they observe the appropriate hygiene conditions.

As everyone who wants to work in our lab needs a safety briefing, we offer these safety briefings every Wednesday at 10 am (usually they last about 90 minutes). An registration for these safety instructions is required.

Details about registration and some answers to possible questions can be found at our opening hours.

If you want to stay up to date, you can subscribe to our Telegram news channel or our mailing list.

The Pool Bottom Suction Robot Wheel

Anyone who has ever been to an outdoor pool knows how important it is to clean pools thoroughly. In the past, people might have been sent down there with a rag, but nowadays this is done by pelvic floor vacuums, small waterproof robots made of plastic and electronics that move back and forth tirelessly on the floor after closing time. The open-air swimming pool in Kaan-Marienborn has just such a machine, and one of its wheels was broken.

Lab manager Marios, Ms. Königsberg and Mr. Wagner from the city of Siegen, mayor Steffen Mues, operations manager Dirk Räwel and Jonas from Fab Lab, who built the wheel. Picture: City of Siegen

So we received an inquiry from the city’s sports and pools department asking if we could print something. The original manufacturer was no longer available and a new device would probably have blown the already tight corona budget. So Jonas and Marios took care of rebuilding the old wheel, first digitally and then printing it out in durable ABS. The mayor was also there and saw for himself that everything works – the application possibilities of Fab Lab Siegen are well received. So now spare wheels are no longer a problem and the robot is looking so confidently ahead, it has even taken on a part-time job at the indoor swimming pool at Löhrtor!

Press echo

10.07.2020 – wirSiegen
Outdoor pools: replacement wheel for pool cleaner comes from 3D printer

13.07.2020 – Westfälische Rundschau
Siegen: Wheel for outdoor pool vacuum cleaner from 3D printer With New Splendor

In the last few weeks we have not only been fighting the Covid 19 pandemic with face visors from the Lab, but in parallel we have also tinkered a new website for you and the Lab. You are bathing your hands in it right now! Have fun clicking/touching and feel free to give feedback via the known channels or to .

For the impatient: At the very end of this post you will find an overview of what is new and what is still to come. For the others, here’s a short story about what we were thinking and what’s involved in such a website relaunch.

The following is a description of our “development process”. Not much was programmed, but it was put together. And that also wants to be done!

The Development Process

First of all, we had a workshop a few weeks ago to find out in which direction the new website should point. Everything we wanted to have on the new website and who we want to reach with it and how. To do this, we asked ourselves the following questions:

  • What information do we want on the website?
  • Who do we want to reach?
  • What could the website look like?
  • How do we want to file the information?
Steamed workshop mindmap

The result is a website based on the blog software WordPress. This seemed to make the most sense to us in terms of functionality and extensibility with plugins. Using WordPress wasn’t new territory for some of the team either, and we had about an idea of what we could accomplish with WordPress. Our requirements were met:

  • Software that is regularly updated so that everything is as secure as possible.
  • Automated display of events in the Lab
  • Image galleries to present the lab also virtually
  • Automated viewing of research results (A list of publications that have been produced as part of the Lab).
  • Easy contact
  • Easy editing of the content by the Lab team
  • Writing of contributions, for example project reports by the community
  • The social component: Visitors should be able to comment on posts and easily get in touch with us
  • Multilingualism
  • Data protection compliance

Team Coordination During These Times

First of all, we started to form a team to build up the website piece by piece. We transferred existing content to the new website, created a menu structure and designed the homepage.


We organized ourselves in a Kanban board (there are many online solutions, take the one that suits you best). We met online audio-visually every day when things got hot, due to corona, and exchanged information about the current tasks. From time to time, a split screen was also used. It has been shown that it is a good idea to make the Kanban board visible to everyone by means of a split screen, so that everyone also knows which task card or ticket is currently being discussed. The cards documented the current developments within a task and stored images or documents. Thus, a documentation of the development was created at the same time.

The 80/20-20/80-Syndrom

As was to be expected, the 80/20 rule also struck us, which one or the other is surely familiar with. 80 percent of the work is done in 20 percent of the time. The last 20 percent then take 80 percent of the time. When you think you’ve got it, that’s when it really starts.

The contents were transferred relatively quickly. But then it was on to finding plugins for calendar integration, image galleries, and privacy compliance, as well as checking content for currency and expanding it. And everything has to be put together somehow, so that the page structure makes sense to visitors and information can be found easily. Where do you write the opening hours everywhere so that everyone can find them?

“But they’re already on the menu under opening hours, aren’t they?!”

Yes, but…. sometimes that’s not enough. So we have made an effort to sort the information as it seemed to make sense to us. We have already done a few user tests, but we are also a bit dependent on your help. Write us, talk to us, tell us if you can’t find something or if something bothers you. That helps enormously! ->

The current version offers little that is new, at least apparently. So you could also say: old wine in new wineskins.

With Sauce and Spicy (That’s New!)

But wait, we also have news!

  1. We now have an overview of the events in the Lab (getting fancier)
  2. Students can get an overview of which courses we offer
  3. We have a separate area for press representatives (still being expanded)
  4. There is a better overview of current and past research projects in the Lab (to scientific publications go here)
  5. The area of occupational safety was revised
  6. There is an overview of the machines and technologies that we can offer as a lab
  7. A subscribable calendar

And What Does The Future Hold?

We have a few more features in mind that will follow in the next few weeks:

  1. An English version of the site – because we have more and more international guests and cooperation partners who depend on it
  2. Possibility for the community to write contributions themselves
  3. Nicer presentation of the dates/events
  4. A press kit for media representatives
  5. An overview of completed theses by students

And many little things are also still on our agenda. Stay tuned and have fun!

Face Visors Against The Virus

After the closure is before the start of production. After all, we, like many other public institutions, had to cease our operations on March 16. Now there were a dozen 3D printers standing around unused. MakerVsVirus and other ideas and projects that developed online in the following days invited us to do something against the virus.

Well, to make a long story short, we are now producing facial visors to reduce the risk of infection to medical personnel and other at-risk groups(the hip girls and guys also call them covid shields). The visors are given free of charge to medical facilities.

Our dear colleagues from the press office have also enriched the whole story with a little more detail and written it down here: Fab Lab of the University of Siegen prints face visors.

What Can I Do?

We can use donations of materials and assistance in making them!

Concrete we are searching for:

  • PETG-Filament 1,75mm
  • PETG-plates 0.5mm, transparent and clear
  • Elastic head hole rubber bands
  • Companies and individuals who have free 3D printing capacity themselves

Feel free to contact Peter Kubior:

Help, I Am a Medical Facility and I Need Visors!

Medical facilities interested in the facial visors can contact Peter Kubior by email:

I Am from The Press and Want to Know More!

Please contact our press office directly for further questions.

Stay healthy. #physicaldistancing not #socialdistancing
Your Lab-Team!


“Garbage – Environment – Design” – With Art Against Littering

As part of the cooperation project “Garbage – Environment – Design“, Sarah and Marios, two of our students, travelled to Palestine last year in September. The two-week project, organised by the Goethe-Institut in Ramallah, was intended to counteract the throwaway culture in public spaces from Europe that prevails there and to build a bridge between consumption and art. For this purpose, approaches of “upcycling” should be used, which make something new out of something old.

Two students each from Germany, France and Palestine were involved in the intercultural project and designed the exhibition and built matching exhibits in a workshop. During the ten-day stay on site, prototypes were to be produced collaboratively from everyday objects through upcycling in order to draw attention to everyday environmental problems. The project benefited from the input of other Palestinian and international experts from the fields of design, art, education and architecture.

The material such as pallets, Yton stones and plastic bottles were picked up directly from the street and were only a part of the countless resources used.
An example of the effective use of materials are the hanging gardens consisting of two green bottle walls planted with mint, which were set up to welcome exhibition visitors at the main entrance of the Goethe Institute. The results were exhibited in the Franco-German cultural area for intercultural discussion and experimentation.

In addition, during the students’ visit to Palestine, the action day “Art and Consumption” took place, in which the residents were to actively and collectively clear a piece of land of rubbish and litter.

The aim of the project was to communicate civil rights, but above all civic duties, and to mobilise local young people in particular to take on civic responsibility. Among others, the project was carried out in cooperation with Vecbox, the first Palestinian Makerspace, who brought local expertise.

Sarah and Marios were already able to draw on experience gained in the West Bank through the Yallah cooperation and exchange project in April last year, as well as through the come_IN project.