OctoPrint Dual instances control box

thingiverse

This is a control box for OctoPrint running on Raspberry Pi 3 B+ with two OctoPrint instances. EDIT: I decided to add an illustrated wiring diagram, but since mains power is involved, I want to say once more that it's not my responsibility if something goes wrong. It's all your own responsibility if something happens, so don't blame me if something blows up. Here is the link to the wiring diagram: https://i.imgur.com/pYo7L1e.png That being said, I made this box to control power and LED lights on both printers through GPIO pins of the Raspberry Pi within OctoPrint. The box is designed to hold a Raspberry Pi 3 (B+), two 2-channel relay modules, a passive USB hub, and a power supply. I used a power supply because it's necessary to power the relay modules and LED lights on both printers. You can also use a small 12V power supply if you want. The box is divided into an upper tray and a lower compartment. The upper tray holds the Raspberry Pi, two relay modules, and a USB hub. The lower compartment holds the mains power and a small 12V 5A power supply. To keep the box small, I had to get creative with the wiring diagram. You can find it on the link above. Be careful when installing the USB connections because they are very close together. I remixed couple models on the upper tray using the PSU control app within OctoPrint. It's a great way to monitor and control your power supply. The 12V fan I used is silent, but you can use another one if you want. Just make sure it fits in the box. You'll also need a USB printer cable because most other cables have long USB connectors that won't fit in the box. Dupont wires are necessary for connecting the relay modules to the Raspberry Pi. You can buy them online or at your local electronics store. The USB hub I used is an ISY IHU-1001, but you can use any other one that fits in the box. Just make sure it has enough ports for all your devices. As always, use crimp connectors and ferrules on your wires to ensure a secure connection.