Creality Extruder Idler Tensioner Arm, Ender 3, CR10 (modified)

thingiverse

This modification is based on the Github stp file here https://github.com/Creality3DPrinting/Ender-3/tree/master/Ender-3%20Mechanical/STP for the extruder idler arm, allowing it to function without threading and using only stock screws. The option for a piece of PTFE bowden tube is included, which I utilized. There are two files available: The first file is 4mmidlertensioner_fixed.stl, now featuring a smaller 4mm hole that enables you to screw directly into it with both the bearing screw and the motor mounting screw, which was initially suitable for this purpose. The second file, idlertensionerptfe_fixed.stl, is the one I printed and am currently using. It's similar to the first file but has a larger 4.4mm filament hole that allows a piece of 4mm PTFE/Bowden tube to fit directly into it (identical to the stock tube), which makes it easier for the filament to pass through without creating a groove. Both files have undergone an additional modification: I extended the part that protrudes out and fits into the spring slightly, making the assembly process more convenient. I created these modifications because I was experiencing the common issue of filament wearing away at the stock extruder over time, resulting in filament snapping and grinding. The original Github files also required a bearing screw to be screwed in but would necessitate threading, which is risky and may lead to breaking the original arm if something goes wrong. It's highly recommended to have a spare idler arm available (as with all parts) in case it breaks, whether you use the modified version or any other.