Parametric round air vent covers made in OpenSCAD, requiring no supports.

Note that the diameter of all .stl files is set 0.1mm shorter than stated to provide clearance.

All of the provided .stl files are configured with a wall thickness of 1.5mm and a fin thickness of 1mm.

There are no prebaked offsets in the .scad file, so I suggest setting the tube diameter 0.1mm shorter than needed (for example, use 99.9mm for a 100mm tube). This will depend on how your printer is calibrated.

It's also possible to create a solid plug by setting the finAngle variable to 0.

Here is a list of values that can be changed in the .scad file:

• tubeD - hole diameter to cover
• plateD - diameter of cover plate
• tubeH - tube height (how far it goes into a hole)
• finH - grid fins height
• finAngle - grid fins angle (creates a solid plate if set to 0)
• finAmount - grid fins amount
• gridDividers - amount of grid fin dividers to support long fins (0 for no dividers)
• tubeWallT - wall thickness of tube part
• gridWallT - grid fins wall thickness
• plateT - plate thickness

There is also a small lip on the plate's outer edge for better fitment. You can adjust its parameters as well:

• plateLipH - lip height
• plateLipT - lip thickness

You can remove the lip (or any other part) by commenting out the corresponding module call, like lip();.

For rectangular vent covers check out:

Vent Cover - Parametric

update 02.05.23: improved spacing of grid dividers for gridDividers > 2