Jumper Tables:

TMC2208

A4988 – DRV8825

Vref settings

All settings are based on 24V input

For detailed instructions read here: Link

These numbers are approximations for 1.7Amp stepper motors. Use the link above to calculate your own Vref

These settings are for standalone drivers – uart and SPI N/A

Causion: For GND use GND on some other place than the driver – like the GND on the PSU Power-In or similar

On XY:

• A4988: 0.8-1.2 V – Not tested
• DRV8825: 0.7-0.8 V
• TMC2208: 1.1-1.3 V

On Z

• A4988: 0.4-0.5 V
• DRV8825 : 0.3-0.4 V
• TMC2208: N/A – Not tested

The reason for setting vref so low on the Z is to have a failsafe if you should crash your bed high or low as the driver will stop and hopefully you don’t crash to hard and break stuff 🙂

On E

• A4988: 0.8-1.2 V
• DRV8825 : 0.7-0.8 V
• TMC2208: N/A – Not tested