Your rack, as files
6U.
7 STL files, 24 pieces to print. They are built in this browser from your configuration, so this link keeps working and nothing of yours is stored anywhere.
Free, and yours to print. PETG, 0.4mm nozzle, 0.2mm layers.
You still need 3 things we do not print
Mostly fasteners, and the inserts that go in before anything bolts together. Sizes, how many packs, and where to get them: