I got the idea to use a USB socket to power my RPi from Teaching Tech's video (https://youtu.be/65ED0GNe7hk?t=355). I couldn't find a USB socket mount anywhere though so I made my own. This will power on and off with the printer so your RPi will as well as anything you plug into the second USB port.

I used this USB socket: https://www.amazon.com/gp/product/B08C7DFQT8/
This socket will take 9-32VDC input so it will connect right to the 24V power supply.

I've included the STEP files as well as the Inventor IPT files so you can modify the parts to your liking.

Creality

Ender 3 Pro

No

No

0.2mm

15%

Used Prusa Slicer and used adaptive layer height but it's not needed.

Printed at 210C nozzle/ 60C bed, no raft or supports.

1. Install the USB socket to the front plate (you can remove the rubber cap or leave it on)
2. Tap the hole in the body with an M3 tap and install a bolt.
3. Mount the body to your printer frame and use the bolt inside to secure it in place.
4. Run the wires through the rear holes and plug into the socket.
5. The ends simply push in to the body and fit snug.
6. Wire the USB port to the 24V PSU. MAKE SURE YOUR PRINTER IS OFF AND THE POWER CORD IS REMOVED.

Designed in Inventor 2015. Designed to fit 40mm wide extrusions.