Rotation distance for Klipper for OMGEXTRD extruder:26.5(Gear diameter 8.42mm*3.14=26.4388).Because every different printer has slight mechanical differences, the value can be tested between 26-27.
NOTE:
There are 2 screws at the bottom that hold the spring in place, be careful not to overtighten it so as not to squeeze and chew the filament too much. Also not too loose, you won't be able to compress the filament. Keep the tightness moderate, generally flush with the bottom edge. Before installing it on the hot end, test the clamping force by pulling on the filament by hand.
NOTE:
There should be no gap between the motor bearing gear and the two large gears, and it should not be squeezed too tightly, otherwise the motor bearing will not rotate smoothly.
NOTE：
* DIRECT DRIVE RETRACTION SETTING:(ender 3v2,Nozzle Diameter:0.4)
Recommended speed 27mm/s distance: 4mm
* LONG-DISTANCE FEEDING FILAMENT RETRACEMENT SETTING:
Speed 30-40 mm/s Distance 7mm
Driving Voltage:
Our ASPINA Shinano Motor(36):The adapted driving voltage is 0.57V .
If the voltage is not changed, the motor may be burned for a long time.