Prusa I3 Migbot (and varients) adjustable tension extruder arm

thingiverse

The original adjustable tension extruder lever by dumbcomputers was unfortunately a tad off for some cheaper Chinese kit printers. As such, I modified the file to put the bearing directly below the top joint at a 90 degree angle instead of slightly offset like it was in the original model. This allows the lever to be used for a wider variety of printers, including my prusa i3 migbot, that have larger springs and normally stick out further above the extruder assembly. This print does require a bit of post processing if using the same setup and screws that I did. You can see that the bearing screw is slightly larger than the hole of the print, but a file, knife, or other such object should be able to open it up enough. Additionally, the files could use a bit of fine tuning. As you can see in the second picture, the side wall of the lever came off when attaching the cover, but it still works fine without it. Since this design doesn't completely cover the bearing you can also just glue the two parts together if you so desire.