When I assembled my first Kossel Mini I though that there is no need to assemble it's arms with good precision and I just glued them together without and jig whatsoever. That resulted a great difficulties when I wanted to level my build platform, so now I decided to fix this issue and do it correctly.

Apparently I didn't find any jigs for assembling magnetic rods so I had to design my own.
This jig is made for 10mm steel balls and 6mm rods.