Klipper Toolboard

A very small 3D printer board for use on a toolhead.

Features:

• TMC2209 driver
• STM32F042C6T6
• Two MOSFET drivers fans
• One bigger MOSFET driver for a hotend heater
• Thermistor input
• One endstop
• CAN bus

Main power is 12-24V

The CAN Bus is not terminated, instead it uses 4 wires, termination should be done at other end.

It uses an external 5V switch regulator.

All done in KiCad

Possible issues:

• Is the cooling for the TMC2209 adequate?

Change ideas:

Is the endstop useful? Better with a servo output?

Use an STM32F103 instead? Pinout is the same. F042 has klipper CAN support. Porting the klipper code to F103 should not be that hard.