About this project
A test scene for coplanar-face artefacts in boolean differences. The model is a device stand, an angled cradle with a rounded channel on a base plate, but the geometry exists to carry one toggle. Switch Overcut off and look along the end faces of the channel, where the cutter finishes flush with the body it cuts.
Overcut
The cutting box that hollows out the cradle has its depth written as stand height plus one times the toggle. On, the cutter runs 1 past the shell. Off, its depth equals stand height exactly, the value that also sets the depth of the solid being cut, so the end faces are coincident and the difference is left resolving a zero-thickness surface. That is the artefact the project is named for. The second cavity box carries a fixed ten of extra depth and never goes flush, so the mess shows in one place only.
Device fit
Device Thickness, 6 to 16, and Device Width, 60 to 95, describe the device and its case. They size the cavity solids directly and the outer body as the same values plus one wall thickness, so the channel tracks the device and the shell stays even. Wall Thickness runs 3 to 6, which the project calls the structural thickness chosen for reliable printing.
Viewing Angle, 10 to 75, tilts the cradle. One expression rotates both body and cavity, so they stay registered as you sweep it; the base plate does not.
What is scratch here
Treat this as a working scene, not a finished stand. The base plate is two boxes with hard-coded dimensions carrying five decimal places, so it ignores the device parameters: widen the device and the cradle grows while the plate does not. Stand Height and the screen frame edge are plain numbers with no slider, and two more variables, rounding and inside rounding, sit at zero, referenced by nothing.