I got tired of designing spool holders for each brand. It does not seem to be a standard for the spool hole.

I uploaded the Sketchup file if you want to make modifications for your own needs.

UPDATE Aug 12, 2018: I modified the design for 608 bearing, but I did not print & test the design.

Mendel90

Doesn't Matter

Doesn't Matter

0.3

30%

Printed with PLA
The base I printed at 0.3mm layer height and 30% infill
The 3 pegs I printed at 0.2mm layer height and 50% infill and 5 mm brim

All the angles are 45 degree so no need for support

You will need 3 M3 screws 17mm long, and nuts. Tighten the screws by hand, if you use hex key it will probably be too tight and it will bend the plastic.

This is for a 1/4 inch threaded rod, and the bearing are 1/4" x 3/4" x 9/32" inch R4A-2RS Ball Bearing