SketchForge is built for the fast iteration loop: import an STL, add or subtract basic shapes, group the result and export. The project presents itself as local-first, avoiding a mandatory cloud account.
This is not a substitute for Plasticity when precision surfacing or sophisticated fillets matter. But for adding a mounting hole, a spacer or a label base to an existing mesh, a deliberately simple tool can be faster than a full CAD session.
The project’s public code and release notes are available, so you can inspect its maturity before relying on it. A useful benchmark is a small print that currently takes too many clicks to modify.
What to do: Try a throwaway STL and add a mounting hole; inspect the exported mesh in Bambu Studio before printing.