Works with this genius system: https://www.printables.com/model/52618-ddd-printable-wall-control-system/files

You will need to download and print the left (2x0-flat-left.stl) and right (2x0-flat-right.stl) side pieces (form the original project) to connect it to your pegboard. 

I designed this so I could top feed my Bambu Lab P1P with a single spool. This holder makes spool changes really easy. 

No supports needed. Just print it as is, with the flat part on the plate. 

Model shown was printed with Fused Materials Transparent Purple PETG (for strength).