[Weeny solder bot (LinuxCNC on A4 paper size)] (https://www.youtube.com/watch?v=rfSAW3zDQ7M)
Remora is a free, opensource LinuxCNC component and Programmable Realtime Unit (PRU) firmware to allow LPC176x and STM32F4 micro-controller controller boards to be used in conjunction with a Raspberry Pi to implement a LinuxCNC based CNC controller.
https://github.com/scottalford75/Remora