I use 8 and 4 relay 5V modules, because thats what i had at the time i build the enclosure. Relays - Sold in 1/2/4/6/8 relay module variants. And webcam on cable is significantly lighter than RPi + cam. I'm working on an arm that will be mounted to Y axis cover and the cam will be looking under my nozzle as it prints to detect if im not making pasta (Spagetti Detective plugin). You cant hang the whole RPi and cam anywhere you want. Why a webcam with USB cable and not RPi cam on ribbon cable? Ribbon cable is short. AND it has only one microUSB B, the second one is for power supply. AND choose the second model (RPi Zero 2 W), because its 4 core, first model wont do. If you choose this model beware: W stands for wi-fi, its important because its so small, it has no LAN. I have tested Octoprint on RPi Zero 2 W and it works, you have to dissable incompatibility warnings, but it just works like on RPi3. When rendering your last print timelapse, it takes much less time, so you can start next print sooner. Thats why i chose RPi4, its more powerfull. Also RPi3 only has 1GB of RAM, RPi4 can have 2/4/8GB, the choise is yours. 4 USB ports, RPi4 has two upgraded to USB3.1. Both have WiFi and bluetooth, ethernet (RPi3 - 100Mb/s, RPi4 - 1Gb/s). It too is a 4-core 64-bit, but the base clock is only 1.2GHz, it can be overclocked, but only something over RPi4 base clock. The small heatsink and fan can keep it under 40☌ under load. It can be overclocked to 2.1GHz with some cooling, because it gets hot realy fast if oveclocked.
Why did i choose RPi4b 4GB? Its 4 core 64bit ARM with base clock of 1,5GHz.
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