M5 Mounted Timing Belt Idler for 6mm Wide Belt
by rp_one_labs, published
If you like designing 3D Printers, you can use this idea in your design. This idler uses 608ZZ bearing and stepped washers to allow mounting with M5 screw.
BOM and Assembly View is in PDF File.
Use 1/8" thick Acetal sheet to mill washer parts, or just print them.