Add BTU mod v4

- This is a full remake compared to v3, which was designed in Rhino. To
  make it more accessible for contributions, it's been redone in
  FreeCAD. This means you can edit it with a free program as well as
  making it parametric. The positions of the BTUs can be edited by
  changing the values in the spreadsheet embedded in the CAD file.
- These parts haven't yet been test printed
This commit is contained in:
George Bryant 2021-01-30 13:56:20 +00:00
parent a5bada1619
commit fc674e1f1b
3 changed files with 357517 additions and 0 deletions

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