The "Idler" part can be edited via Tinkercad: https://www.tinkercad.com/things/aRUfEamzZzD-prusa-i3mk3-idler-r3-b7 and was originally made for http://libre3d.com/category/603/Accessories/listings/1180/TronXY-X5S-adaption-of-Prusa-i3-Mk3-Extruder-(R3B7)-and-E3Dv5-XCR-BP6.html You also need the STOCKTRONXY__X5_DUCT_V6.28.stl from https://www.thingiverse.com/thing:2984806 Shouls the counterpart for the drag chain snap, take a look at: https://www.youmagine.com/designs/fix-for-snapped-cable-chain-carriers/