8040 Sim Rig Feet with noise reduction layer

I built a sim rig out of 8040 and 4040 aluminum extrusions and wanted my vacuum robot (Roborock S7) to clean below it. Therefor I designed feet in FreeCAD to raise the entire construction 10.8 cm from the ground.

The corner feet are a little wider (45mm) than the aluminum profiles so they can act as bumpers and protect the aluminum from scratches when moving the rig around. The straight feet are exactly as wide as the profile (40mm). Both feet consist of a large main body that I used PETG for and small rubber feet that I printed with TPU. The idea behind the TPU feet was to have some sort of decoupling from the floor to reduce noise. I recommend testing whether your TPU leaves traces on the floor when sliding it around before you print the rubber feet with it. The feet keep the rig from sliding around when sitting inside and are very sturdy even with the low infill settings (see below).

The main bodies are mounted to the aluminum profiles with normal M8x16 screws washers and T-nuts (3 screws for one corner foot and 2 screws for a straight foot). The rubber feet just need to be pushed into the main bodies and stick in there by themselves due to the layer lines.

For printing it is important to use strong walls!

I used the following settings:

Main bodies:

• Filament: JAYO PETG black
• Temperature: 245°C
• Layer width: 0.6mm
• Layer height: 0.32mm
• Infill: 10%
• Wall width: 2.4mm (top, bottom, inner, outer)
• Support: none

Rubber feet:

• Filament: Sovol TPU red
• Temperature: 235°C
• Layer width: 0.4mm
• Layer height: 0.28mm
• Infill: 30% (A little less is probably also fine if your TPU is not very soft)
• Wall width: 2.4mm (top, bottom, inner, outer)
• Support: none