Sector67 - run by Chris Meyer. They used to rent a building on the east side off Winnebago street (now demolished). They purchased an old warehouse off Corry St. in 2017 and did a really extensive renovation (almost entirely performed by members): https://isthmus.com/news/news/sector67-finds-new-home/

I spent a lot of hours welding, using the wood shop, and working on my car there.