Like a few other people, I cracked the end off my idler during some aggressive construction. The original design carries a fair bit of force through a narrow section with tension between layers - the weakest dimension in a 3D print. So, here's a design that's a bit stronger where it pivots.Drill out the hole for the pivot bolt in the main extruder piece. Make sure the bolt moves freely within it. If things don't seem well aligned when you continue assembly, perhaps loosen this hole a bit further.Clean out the slotted holes where the tension screws go, to ensure free movement there too.Bolt front-to-back with lock nutsBolt back-to-front