Filament Spool Ball Bearing Conversion Kit for CraftBot 3D Printers

These models are designed to use four each (4x) 6203-2RS ball bearing which is a low-cost, reliable, and readily available part to convert the filament spool bracket on Craftbot machines into smooth low friction easy on, easy off spool holder.

The 6203-2RS ball bearings are 17x40x12 (17mm ID (bore) X 40mm OD X 12 wide/thick).
https://tinyurl.com/u5pgehj

The second item needed in addition to the ball bearings are:

Two each (2x) 4-in (1-1/2 ID, non-mini) Paint Roller Covers w/ 3/8-in to 1/2-in knap thickness.
https://tinyurl.com/s5xyk44

These paint roller covers slide over the bearings and are a great way to ensure a myriad of filament spool inner diameters will still work since many of them only vary by a few millimeters for the spool ID for 0.5kg to 2.0kg. Larger 5kg spools may not work with this design since some of those have a much smaller spool ID.

The base file is designed in DesignSpark Mechanical 4.0. You could also edit this design in ANSYS direct modeling software such as Space Claim. I have included two files in rsdoc (DesignSpark) format: One is the entire assembly, the other is the layout for printing.