Customiser: YAPI - Yet Another Pulley for Idlers (aka "Yay, no more soot")

Put together to reduce the amount of black dust and soot, the result of abrasion of Y belt at the idler of my cheap Chinese interpretation of a Prusa i3 Pro B. Traces of belt wear are clearly visible in the enlarged photo.

Divided into two (no bearings) or three (bearings, additional axle chuck / bearings distancer) parts, overhangs are entirely avoided, resulting in an easily printable implementation.

Can be customised to operate with or without ball bearings, however I'm afraid that with