Just a simple geared knob for my CR-10 extruder.
Fits most printers with Nema17 stepper motors or generally with 5mm shafts.
An easy way to manipulate the feed and a nice visual tool to spot your retraction behavior.
It is a very very tight fight. You may want to upscale it by 0.5-2%
V2 High Clearance / Extended version
Added a high clearance version so you can check the filament rolling between the gear and the pulley.
Gold is the short version (v1)
Gray High Clearance / Extended version (v2)