Universal holder for filament spools with hole diameter 31 - 58 mm. No need to twist off the nuts from screw rod due to special construction of holder. Due to very limited space for printer, the only possible solution of spool location was above the printer. The base is made of pieces of MDF, but can be also used plywood or any other material. Holes in the base were cutted by router, hole sizes were chosen based on the dimentions of available bearings.

The design was done for M8 screw rod and M8 nuts. I had a problem with M8 nuts from different suppliers - their external dimensions were differ a bit - so file "Wire holder spacer" compensated this problem.

Changing of spool now takes short time, its easy and spool fixed very well. Bearings provide extra smooth rotation of spool and it doesn't occupy place around printer.