Bambu AMS Buffer Tube Guide

Ever since I received my AMS, I've had filament retraction issues. It was really bad to start, then I tried every solution I could find online and each one helped incrementally, but it was still failing to retract the filament about 50% of the time. I was running out of ideas, when I saw a tube guide on makerworld. It wasn't quite the right shape to work for me, but it did help me identify that the problem was the entrance to the buffer mounted on the back of the printer. I designed this shelf t