Another Ender 3 spring tensioner

thingiverse

This is another version of a spring tensioner for the Ender 3 extruder drive. I was getting filament slip and grinding, and found that the spring was slightly bent which reduced longitudinal pressure. This tensioner reduces the lateral play. Additionally, there is a hole to accept the spring guide screw which allows for some adjustability. Two versions included, a 15mm length (which worked for me) and a 14mm length if you have trouble with the longer one. I suggest you use a fairly high infill for strength. It's hard to get on, but it has solved my slipping issue!