2 layers70 × 101.7 mm

Nucleo expansion
j-silv/stm32-3d-printer-controller
STM32 Nucleo expansion board developed for controlling a RepRap 3D printer
87 parts9MIT
Boards in 1 GitHub repository, designed in KiCad, that use the BD237 by Jiangsu Changjing Electronics Technology (CJ) (-55℃~+150℃ 1 NPN 100uA 25 25W 2A 3MHz 5V 600mV 80V NPN TO-126F-3 Bipolar (BJT) ROHS). See how each wires it, with its parts, size, README and files; the BD237’s symbol, footprint and pinout are on its own page.

j-silv/stm32-3d-printer-controller
STM32 Nucleo expansion board developed for controlling a RepRap 3D printer