im Renan im a 18 year old student who really wanted a prusa printer but didnt have the funds so i decided to source them myself 

so after sourcing parts here and there i found a prusa bear upgrade kit so i built the bear frame and bought original motors and rambo einsy 1.1b

now i installed everything i noticed that everytime it would bed mesh level it would crash into the right side so i found out that the bear frame was meant for mk2.5 and i have a board that can only run mk3 firmware so i asked support and they told me i needed custom compiled prusa firmware but honestly i know some stuff about the marlin software but im not necesarry a pro so im asking for some help by people who have some knowledge for me making my custom firmware