Model originally uploaded to Thingiverse at https://www.thingiverse.com/thing:4015230.
This is my version of a Raspberry Pi mount for the Anycubic Kossel Linear Plus. It will likely fit any printer with 2020 extrusions with a 6mm slot. The Pi sits recessed 1mm from being flush with the outside of the extrusion, so access to the USB & Ethernet ports is simple. The mount has a protrusion that fits into the extrusion's slot for alignment and a single 5mm (or smaller, with washers) screw for attachment. I've uploaded two versions. One has holes 1.8mm for M2 screws (they'll cut their own thread if you start slowly with pressure, works best with PETG), the other is for M2.5 screws (with 2.3mm holes). The Raspberry Pi's mounting holes are too small for M3 screws, and when I first designed this, I had no M2.5 screws, hence the M2 version (I'm in the US, so metric screws are typically a mail-order item).
I made this for my conversion of my Linear Plus to run Klipper firmware. See thing 4015280 for an SKR v1.3 mount that I'm using with this (mainly for the simple configuration of TMC2130 drivers).