Mainboard only CPU, stepper driver not included, driver can be found here


Design for replacing the stock cetus mainboard MK1 2 and 3. 


For use with Pololu style stepper driver, Please insert the driver in the correct orientation. Switch off power before insertion.



pololu style stepper driver (a pair of motor wire need to cross over depends on the driver install to make the direction correct)

stock Cpu

stock MK1/2, MK3 Heatbed,

stock Zprobe

tinyFab Cpu

tinyFab Heatbed (10pin or 12pin FFC)

pin out for BL touch


Mounting bracket for MK1/2


Schematic note the CPU pinout is swapped by the bracket

Schematic download here

TinyFab Mainboard

Printer model
Heatbed type


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