OpenForge mould

An attempt at building a mould to cast OpenForge streets out of plaster.

I am finding that to make the openforge shapes work on OpenScad, I must use Meshmixer 'make solid' to completely resample the shape to get a manifold. From there, Meshlab 'laplacian smooth' and 'quadric edge collapse decination' produces a workably simple mesh.

These meshes can be subtracted from the mould lower texture by editing the openSCAD, or can be subtracted form the 'no texture' STL and then flipped upside-down for printing.

The "no texture" STL is positioned such that if an OpenForge piece is placed with a corner at 0,0,0, it should subtract correctly. The OpenForge pieces are positioned at various places, but those places seem to be multiples of 25mm, so it's relatively easy to line them up. Or you cvan use a bit of software to align the piece at the origin: I think I wrote a java app to do it, which is laying about somewhere on my hard drive somewhere.

21-Nov-2017:
Ok. Separating the mould