Printrboard Rev B through D
This guide is for the older Printrboard Rev B through D. Click here for a guide on adjusting digital pot settings on the more modern Rev F Printrboards.
Stepper drivers and stepper motors are extremely precise, so precise that they all require slightly different settings for optimum performance.
Stepper motors can run pretty warm, but running them as cool as possible while ensuring that no steps are skipped will allow for maximum performance and reliability.
The potentiometers or "pots" on the printrboard are very small knobs that you can adjust with a screwdriver-like device (we recommend something plastic, sort of like a guitar pick).
Turning a pot up sends more current to a motor (which gives it more power, and generates more heat)
Turning a pot down sends less current to the motor (which gives it less power, and generates less heat)
The trick is to find the happy balance between the two: enough power, without generating too much heat.
Identify the correct potentiometer or "pot" to adjust. Each pot is a small knob that can be adjusted with a tiny screwdriver, next to each extruder port.
Here are the pots in order from top to bottom when mounted on the
Simple Maker's Edition (Model 1401):
Determine whether a stepper needs more or less current.
A motor that gets very hot to the touch or is very noisy indicates too much current, and needs to be turned down.
A motor that skips steps (fails to move when it should) indicates too little current, and needs to be adjusted up.
Adjust Motor Current (Printrboard Rev B through D)
Step 5 With a plastic (guitar-pick-like) screwdriver and the printer powered off, make adjustments
in 1/8th or 1/16th turns.
Clockwise is up (or more power)
Counter-clockwise is down (or less power)
After making adjustments, power up the printer and test again.
If the motor skips steps when you move it (or extrude filament out of a hot extruder), power the printer back down and make a small adjustment up
When the motor starts working reliably without skipping steps, you've reached the optimum current for that motor.
Click here for a pdf of this guide or download the attachment at the bottom of this article.