Ender 3 tray for Raspberry Pi and a DC converter

Thanks to the model I saw from GlassCurtain (https://www.thingiverse.com/thing:3026077), I decided to remix it basically adding more supports for the aluminium printer base, extend the walls to the top of the tray, add vents on all walls and lower a bit the back wall of the Raspberry Pi compartment (to help the air circulation get to the converter). The supports for the aluminium printer base has been modified to hold better in place. Now the tray slides easily to its place and holds the positio