BTT SKR 1.4 and Pi Zero 2W mount for Geeetech A20M
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BTT SKR 1.4 and Pi Zero 2W mount for Geeetech A20M to replace the original GT2560 V4.1 system board.
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This is a new motherboard mount for the Geeetech A20M to allow installation of the Big Tree Tech SKR 1.4 along with a Pi Zero 2W form factor device and MP1584 buck converter. Main features are:
- The microSD card of the Pi is accessible from the outside through the original SD card slot, making it easier to replace if it gets corrupted.
- Cooling duct for the steppers to use a dedicated 4020 radial fan. I used the original part cooling fan as I had to rebuild the entire extruder assembly do to it being damaged by someone and no longer needed that size fan for part cooling. If you are unconcerned with stepper cooling or are still using your original part cooling fan, you can omit the duct and mount arm.
- Integrated mount for a MP1584 style buck converter to power the Pi.
I printed in PETG; PLA would likely work as well. The fan mount arm requires two heatset inserts, M3x4mm. The rest of the mounts are intended for self-taping or using the existing mount points, with the chassis to mount reusing the original mainboards mounting screws, the Pi using M2x4mm screws, and the mainboard using M3 screws. Depending on if you use the fanduct you'll need a few longer M3's, but if you aren't, M3x6 should work.
There is a cable management bracket that will need to be removed as it sits under the SKR, you can pry it off carefully with pliers (see last picture).