This is another model I put together while building up a solution similar to https://www.printables.com/model/146367. I was not able to find the 40mm pipe required and so needed to make a 25mm pipe that I had on hand, fit without the spools losing height in the box.

The half moon shape, when sitting with the opening upward, allows a 25mm pipe to side in a harness designed for a 40mm diameter pipe, while still meeting the same highest point.

Printing 2 at the same time:

• Layer height: 0.2mm
• Infill density: 10%
• Print time: 0h41m
• Total filament used: 3.035m