Box to hold a Raspberry Pi and MKS Gen L on an Ender 3 Pro. Ports are on the front for easy access. Boxes mate with dove tails.
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cable path for screen, Z limit, pi power/ethernet
Raspberry Pi power button (I'm using the using OnOff Shim)
So far I've printed the left side at .32 with no supports and it came out great. I had a stepper driver mishap which necessitated the upgrade to the MKS Gen L before I was ready.
All of the mechanical pieces for the Ender 3 are available via github, which really helped in designing this.
Update 2019-02-13: Added hinged lids. The hinge will slide forward in the track so the lids can be pivoted up, clearing the bed. I used a pair of nails for the pins in the hinges. You may need some light sanding to get the parts to mate if you over extrude. There is a hole pattern for a 5015 radial blower on the Pi lid, I have placed the fan to blow across the stepper drivers. The render shows a 2 relay board, but there are no mounting points. It fits there nicely though.
Update 2019-02-08: Right side adjusted by 1mm, and now includes Rpi studs and ports. Added an externally accessible tray in the unused portion. Lids are a work in progress.
I connected the Serial on the Rpi directly to the D0, D1 on the MKS Gen L, along with the ground so they would be common. To enable the Serial on your pi, go to raspi-config and set it in the communications menu. The serial port will be /dev/ttyS0 for pins 8(TX) and 10(RX) The serial pins are available on the AUX1 header as D0(RX) and D1(TX) (mislabeled as D1 and D2 on some pinouts). Keep in mind TX (transmit) should connect to the opposite RX (receive). I will probably add versions without the dovetails so it is easier to move the trays independently.