Rhino datums for LPBF copper cold plates after machining

Rhino Rhino for Windows
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We are preparing Rhino models for LPBF CuCrZr cold plates that will be stress-relieved, CNC-finished, pressure-tested, and thermally validated. The solid geometry is manageable; revision handoff is where ambiguity appears.

Our current 3DM structure is:

  • a locked AS_PRINTED body layer;
  • separate MACHINING_STOCK surfaces for sealing faces and ports;
  • an INSPECTION layer for datum targets and probe-access geometry;
  • a CHANNEL_KEEP_OUT layer that survives export;
  • one revision-matched 3DM, STEP, and drawing PDF.

For people using Rhino in an additive-to-machining workflow:

  1. Would you keep machining allowance as separate closed solids, offsets, or object user text?
  2. Are Named CPlanes reliable enough for downstream datum communication, or do you also model explicit datum targets?
  3. How do you stop inspection and keep-out geometry from being lost when the STEP file is opened outside Rhino?

For context, our current copper LPBF RFQ handoff page is the downstream checklist I am trying to make unambiguous from the 3DM model.

Disclosure: I work with Copper3DP; the link is included as project context, not as an endorsement request.