Octocoupler to use with the LJ18A3-8-Z/BX for my Anet A8 3D Printer.
From Aliexpress it models the "12V 1 Channel Optocoupler Isolation Module Isolated Board No Din Rail Holder PLC Processors 80KHz PC817". I would've bought through Aliexpress but I'd prefer not having to wait a month for one piece.
I bought the 817s on Amazon.
Resistors from Frys.