On Monday, the Netherlands painted the streets orange for King’s Day 
. One of the highlights? The Vrijmarkt - a flea market where the Dutch give their old gear a second life.
But the Dutch spirit of reuse runs deeper than a street market. From launching the first Repair Café in Amsterdam to driving the European Right to Repair, they proved that the future of hardware is circular.
At AISLER, we know the European engineering community drives this movement. We build & we fix.
King’s Day is over, but we are keeping the stalls open. Welcome to The AISLER Vrijmarkt Challenge.
The Challenge
Great engineering rarely starts from scratch. Throughout May, we want to see your brilliant ‘Reuse’, ‘Upcycling’, and ‘Repair’ projects.
Show us how you keep electronics out of landfills. Give old tech a new pulse or hack existing hardware into something entirely new.
Need some inspiration?
Recently, one of our sponsored student teams took an old pizza oven and reworked it into a fully functional PCB reflow oven. Or another idea: Some people asked our team what to do with unused PCBs - do you have a creative idea? 
The Prizes 
At the end of May, our team will review all the submissions and select three best projects based on creativity, engineering ingenuity, and the spirit of circular engineering. If it’s hard to decide, we may ask for your help in a poll. 
The top three creators will win AISLER Store Credit to help fund their next prototype!
1st Place: €100.00
2nd Place: €75.00
3rd Place: €50.00
How to Enter
- Build & Share: Start a new topic in our Great Projects category. (Use our template to make it easy!)
- Tag It: Add the tag
Vrijmarkt2026to your post.
- Tell the Story: Upload your photos, or share links to videos. Tell us what you rescued and what the final project actually does.
Timeline
The Vrijmarkt is officially open! You have until Sunday, 31st of May 2026 at 23:59 CEST to submit your projects. We will announce the winners on Friday, 5th June 2026 at 13:00 CEST in our community.
Rummage through your spare parts drawers and let’s build a more sustainable future out of the things we already have.
Good luck! 
