Craftbot Spoolholder Shaft with 6003 Ball Bearings

thingiverse

A fully loaded spool my be quite heavy and create significant friction on a standard Craftbot spool holder, stressing the extruder drive. This spoolholder shaft - Fits on standard Craftbot spool holder axles (10.2 mm diameter x 100 mm unobstructed cylindrical length) - Minimises friction by means of two type 6003 ball bearings (17 mm inner x 35 mm outer x 10 mm depth) - Has a rim diameter of 48 mm, supporting spool hub diameters from 50 mm upwards Optionally: - Lets you align the spool to the rear of the shaft by means of a slider. The slider is optional. You may do with the ball bearings, printed ball bearing adapters and printed shaft. The slider uses a piece of 1.75 mm filament as hinge axle. In the locked position the male and female halves are held together via a magnet(s) / screw(s) combination (magnet(s) in the female half, screw(s) in the male half). Apart from the 3D-printed parts - 4x printed ball bearing adapter halves - 2x printed shaft halves and optionally for the slider - 1x pair of slider halves (male and female) you will need: - Two M3 x 10 screws plus nuts and optionally for the slider - One to three (your choice) Neodyme magnets 4 mm diameter x 10 mm length - One to three (your choice) M3 x 8 screws Further you will need as tools: - 3.0 mm drill to calibrate the M3 boreholes of the shaft and optionally for the slider: - A piece of 1.75 mm filament as hinge axle - 1.8 mm drill to calibrate the femal hinge bore - 2 mm drill to calibrate the male hinge bore - M3 thread cutter for the male slider half - 4.0 mm drill to calibrate the magnet boreholes of the female slider half - Superglue to fix the magnet(s) and secure the hinge axle (piece of 1.75 mm filament) to the female slider half. As an alternative to supergluing the magnets you may drill their boreholes to 3.9 mm, the borehole entry some 3 mm deep to 4.0 mm and then press the magnets into the 3.9 mm holes. As always I include the OpenSCAD source files for you to adapt and improve. Postscript: The need resulted from my printing and use of https://www.thingiverse.com/thing:4440926 on my Craftbot Flow IDEX. I was inspired by https://www.thingiverse.com/thing:4261019 which is a great solution to start from. I am using bearings with smaller outer diameter (35 mm instead of 40 mm) in order to accomodate spools with smaller hub sizes while maintaining a sufficient rim. Further I added the slider option. See also my other designs: https://www.thingiverse.com/thinger13/designs