I only printed the Arch version. The bigger version was designed to rest on the bottom of the Besta and the pegs just help it stay in place.
I don't know all the details of my print but here's what I know:
3D printer: Ender V3?
Filament: Creality PLA+ Rainbow
Design program: Fusion 360
Edit (02/17/2024):
The pegs have broken from the weight of the vinyl so I need to find a better way hold up the shelf.
The author marked this model as their own original creation.