A common low-strength fixture for stack-mounting 3060 and 3030 aluminum profiles

The round holes are M6 sized, to be secured with M6 European standard aluminum profile slider nuts or T-slot bolts

The protruding part is a 5.5*5.5 square locating pin, which directly inserts into the aluminum profile for positioning

The reason I designed it at the time was that my steering wheel simulator stand had a lot of space, and the office chair wheels, even when pushed in, were still a bit far, so my feet weren't long enough to reach the accelerator pedal

Then I found a European standard 3060 aluminum profile model on MakerWorld to print; after looking around and not finding a suitable fixture, I quickly made one myself, and on a whim, I uploaded it to MakerWorld