Ender 3 Pro RaspberryPi 4B case with relay

Hi, this is one of my fist big designs/remixes, and i think it's really great. if anyone has suggestions to change anything, or wants to ask something, I'm happy to help.

i designed to take a RaspberryPi 4B, robotdyn 30a relais and a step-down converter.

this is the relais I use:
https://robotdyn.com/relay-module-1-relay-5v-30a.html

and the the step-down converter:
https://www.banggood.com/Geekcreit-5A-XL4005-DC-DC-Adjustable-Step-Down-Module-Power-Supply-Converter-p-923600.html?cur_warehouse=CN&rmmds=search

double check your wiring! I'm not responsible if you fry your part. also be sure to cover up the 5v rail on the usb kabel so the pi won't power the printer.

if you're not sure about the wiring, check the diagram of the original case where this remix is made from.