This is a 19" 2U rack frame that can hold 2 boxes.

It was designed to hold 2 boxes, 4U x 4U x 6U Gridfinity boxes by Pred (https://www.printables.com/model/543553-gridfinity-storage-box-by-pred-now-parametric), but it will hold any other boxes with similar measurements.

The Frame is printed in multiple pieces, and while they can all print on the same plate, i recommend splitting them onto multiple plates.

The frame is friction fit, and intentionally a tight fit, but I have not had any problems assembling it.

This has not been optimized to save plastic

I printed with Generic PLA, 0.4 nozzle, 0.20mm Standard profile

I did not use any supports

Assembly:

Press together the front parts, then push the assembly towards a table or something to make sure it is flush.

At the end, install the rear beams for added strength.