Parametric Flat Mounting Plate w/ Custom Holes

Updated 2025/10/29 - everything should now work in increments of 0.1 mm

A fully parametric flat mounting plate generator designed in OpenSCAD to create custom bases, covers, or mounting panels for electronics, sensors, and 3D-printed assemblies etc. I used this to create a mounting plate for some USB chargers (as seen in photos) that will be mounted in my truck via zipties/bolts to a molle panel after getting tired of cutting HDPE to size and drilling holes.

This SCAD supports either corner or centre origin coordinate systems (lower-left corner or centre = 0,0) or for hole placement. It supports both CSV-style string input for unlimited holes and individual per-hole entries up to 25.

included 3mf just has a couple random sample plates + the one i used for the USB chargers in the photos.

Key Features

• Selectable origin system - choose "corner" (lower-left = 0,0) or "centre" (plate centre = 0,0).
• Sub Millimeter support - everything should work with increments of 0.1 now.
• Exact W×L×T envelope, even with edge fillets.
• Flexible hole input - string or per-hole text inputs.
• Through-holes, blind holes, and countersinks (45° cone).
• Rounded corners (XY) and optional 3D edge fillets .
• X and/or Y back channels for routing wires or zip-ties.

Back channels are only 1 on either axis as that was all i needed. If anyone needs that to be more configurable let me know and i'll figured out a way to support multiple on each axis.

Notes

• Current version supports one back channel per axis (X and Y).
  If you’d like to see support for multiple channels in each direction, leave a comment and i'll add it.
• Hole inputs outside the plate bounds will echo a non-fatal warning.
• Edge fillets: set edgeRadius = 0 for faster previews or for sharp edges, then restore for final render.
• Rendering: set fn to a low number when designing, then set to a high number for smooth cures. i usually go above 100 for final export