Export your finished train as a stl, 3mf, fbx, etc. for 3d printing
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The main problem that I know of is that prints want a unified/watertight mesh or clipping watertight meshes where as games only needs surfaces/planes to be shown
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an option for interior vs filled in interior would be nice (taken to the extreme would be floor by floor/dollhoused rooms)
Beyond this point I'm being a bit persnickety
My concerns for resin 3d printing:
- not high enough detail (resin can do textures but it needs to be on the mesh)
- not fully watertight mesh for infill (It needs to be able to drain resin without a buttload of holes)
My concerns for color 3d printing:
- to a lesser extent detail
- file format matters (for as an example .stl can't store color)
- colored differently than advertised due to shader/texture reasons
my way out there ideas
- print in place joints
- 3d scene capture
- 3d map capture
(I own a resin 3d printer which is why I put it higher)