Square Plastic HVAC Sheet Metal Rivets

The file `hvac-b.stl` should be printed **on its side**, likely with supports, to prevent stress fracturing and material failures. 3D printing is an anisotropic process, and as a result, orienting the legs of `hvac-b.stl` upwards may result in a weaker bending capability at the base of the `hvac-b.stl` legs, which are stress-bearing.

This print is done in imperial (inch) units. Some slicers will import the imperial `inch` dimensions as `millimeters`. Simply set the scale to 2540% to convert m