Initially designed by Mark Blanchard who has permitted me to upload here for the community to find.
His initial files are done for his printer and can be a little loose.
My revision files MMA Rev... Are for calibrated printers and are a lot more snug to the roller accessory.
Bearings required are Diameter 16mm. Inner diameter (hole) 8mm and depth 5mm
Tape can be used to help secure the bearings if loose and also on the roller.
The author marked this model as their own original creation.