Anet A8 PSU cover with switch, relays, fan and OctoPrint

thingiverse

Just another PSU cover with power switch for Anet A8 printer. This one can also contain a *2-channel relay board* to remotely cut off power to the printer, an *Orange Pi Zero Plus* to run OctoPrint, a 5V AC/DC to power the Orange Pi, and an 8x8cm fan to cool down the PSU, the Orange Pi and the AC/DC board. My setup is as follow: * one Orange Pi Zero Plus (probably other versions of Orange Pi *Zero* can fit) * one SunFounder 2-channel relay module ([this one](https://www.sunfounder.com/2-channel-dc-5v-relay-module-with-optocoupler-low-level-trigger-expansion-board.html), can be bought on [Amazon](https://www.amazon.it/dp/B00E0NTPP4) or [AliExpress](https://www.aliexpress.com/item/32679303234.html) too, see official [wiki](http://wiki.sunfounder.cc/index.php?title=2_Channel_5V_Relay_Module) for additional details) * one [power switch](https://www.amazon.it/dp/B00F4MGRRE) (**note**: there are two similar versions of this switch, one with countersink screw heads and one without, depending which one you buy, you need to use the right screws) * one AC/DC board (220V to 5V) to power the Orange Pi (of course you can use any 5V AC/DC with enough power, my design is for [this one](https://www.amazon.it/gp/product/B0769K2YN1/)) * one 80x80x25 mm fan (I've used an old Coolermaster fan, but other fans like [this](https://www.amazon.it/dp/B0743HBS2K/) or [this](https://www.amazon.it/dp/B00H3SWJ24/) should fit, I've powered it with 5V instead of 12V, the spin speed is enough) To mount the whole box you also need: * screws - 2 screws M3x10mm countersink head (for switch) - 10 screws M3x12mm countersink head (for switch reinforce, AC/DC board and Orange Pi board) - 4 screws M3x18mm countersink head (for relay module) - 7 screws M3x10mm round head (for front and right box panels) - 1 screws M3x18mm round head (for left box panel) - 2 screws M4x16mm round head (for fan, **note**: these are **M4**, not M3) * nuts - 23 M3 nuts - 2 M4 nuts * wires - 16-18 AWG 220V wires for neutral, line and ground (from plug to internal fuse, from fuse to switch, from switch to relay and from relay to PSU) - 22 AWG 220V wires for neutral and line (from fuse to AC/DC, **note**: the AC/DC is directly connected to the fuse bypassing the switch, this way the Orange Pi is always on) - 22 AWG 5V wires for Vcc and GND (from AC/DC to Orange Pi) - 6 dupont wires female-female (from Orange Pi to relay) * connectors and other - one 2-pin PCB screw terminal (like [this one](https://ebay.us/Lts5aW) for AC/DC 220V input) - two 2-pin JST couple male+female (for AC/DC 5V output and for fan input) - one micro usb male connector (from AC/DC JST output to Orange Pi input) - one 2A fuse to be installed inside the power switch - one small switch (not needed) to switch on/off the fan (you can also use a transistor switch controlled by an OPi's pin) I will attach a schematic diagram as soon as I have free time to design it. **WARNING** Unfortunately I discovered that the location of the Orange Pi is not optimal because the USB cable to the Anet board suffers interference (EMI) from the PSU. So I moved the OPi above the PSU attaching it to the Anet frame with [this simple holder](https://www.thingiverse.com/thing:4078408). All the interference disappeared.