Open-source Spin Coater

https://github.com/hacker-fab/spincoater/tree/main/electronics/main_board

(scroll down past this PDF to see the board)

PCB Board Rendering — Board rendering

Layer 1 Signal — Layer 1 (signal)

Layer 2 Ground — Layer 2 (gnd)

Layer 3 Signal — Layer 3 (signal)

Layer 4 Power — Layer 4 (power)

Layer 5 Ground — Layer 5 (gnd)

Layer 6 Signal — Layer 6 (signal)