I'm building an enclosure based on Jure Korber's https://www.thingiverse.com/thing:2792618 but decided to make it in 2020 Aluminium Extrusion instead of 3030
I wanted a set of adjustable feet for levelling the printer enclosure but couldn't find any.
Post printing the threads were a bit tight, so I ran an M8 tap through the end caps and the fit was perfect.
The files cover both 2020 and 3030 Aluminium Extrusion
Note: Print the screw with 100% infill
Running a M8 tap through the threaded end cap will clean it up and make it a nicer fit.