I didn't have t-nuts on hand so I remixed the part to clip right into the extrusion without the need of additional bolts. This might not work for someone who wants to mount this in a vertical orientation.
I printed it using PETG but PLA should be just fine, since the parts don't have to withstand a lot of force nor weight.
These ware my print settings, but you can choose whatever works for you best :)
0.4nozzle
15% Infill with adaptive cubic pattern
4 walls, 3 solid Top&Bottom-Layers
The author remixed this model.
This remix doesn't require bolts and t-nuts to be fixed to an extrusion