Ender 3 Raspberry Pi 2/3 mount
It should fit without problem if the printer is calibated. If not please consider to calibrate it, or print 101% scale.
07/10/2018
30mm fan added
THERE IS NOW A 2 RAILS VERSION: https://www.thingiverse.com/thing:3075921
UPDATED V2
Basically i switched the front and the back, I find it to be stronger.
V2 FILES ARE NOT COMPATIBLE WITH V1
I made this Raspberry Pi mount for the  Ender 3 because i didn't want to use screws and I wanted the hole for the RasPi Camera.
Since I'm planning to leave it always on, I decided to put a 40mm fan wich
gives me a temperature drop of 10-15 degrees  (during a print it stays at 42 °C with a room temperature of 28 °C).
However I included a version of the top mount without the fan hole in case you don't want it.
This box can be easily slide into the  Ender 3 frame as shown in the photo. You only have to remove the 2 screws wich are holding the printer screen.
To design it I used this model of the Raspberry Pi that is incredibly detailed and well built.…