Clough42 Gridfinity Grids - Stacked for Printing

I love the idea of @Clough42's Gridfinity Grids - Stacked for Printing, but there wasn't much info on how to actually get the printer to do the thing, and I was initially faced with some issues.  Comments on that model showed that other people were having issues, too.  I responded there but can't upload a project file, so I'm creating a remix to try to help others out.  So:

Here're my notes on getting custom grid stacks exported from Fusion (2604.0.316) and set up in Bambu Studio (2.3.0.70) for my H2D.

In Fusion:
1. set slotsWide and slotsDeep to the desired size; even though you can squeeze a 7x7 grid onto the H2D's build plate, that doesn't leave space for the prime tower, so 7x6 is more practical.
2. set NumToStack to the … uh … number to stack
3. I don't see a param for gap between.
3. The "Combine2" operation will go yellow; you can ignore that.
4. right-click "Blank Frame" → Export…; export as a STEP file (STL made BS cranky and I had to paint on supports)

In Bambu Studio:
1. drag the STEP file onto the plate; I went with the default import params
2. center it on the plate and move it as far towards 0 in the Y direction as you can to leave space for the prime tower
3. configure support settings (see below, and attached images)
4. drag the prime tower (in the prepare tab) out of the way

Support settings:
- Support → Enable Support - on
- Support → Type - normal (auto)
- Support → Style - Snug
- Filament for Supports → Support/raft interface - choose your PETG, accept the suggestions
- Advanced → Initial layer expansion - 0mm (keeps from drawing a useless raft on the first layer)
- Advanced → Bottom Z distance - 0mm (allows actually rendering the support between grids; otherwise it's just a hint of support around the edges and the next layer is unsupported)

That got me to a sliced job that looked reasonable with support only where I want it.  The printed version (Bambu Basic PLA with MatterHackers MH Build PETG for support) came out perfectly.