[OpenSCAD] Semantics CSG ops with respect to color, materials

doug moen doug at moens.org
Fri May 22 09:15:40 EDT 2015

Hi, Biskero, that's an interesting requirement.

I'm not sure if AMF is suitable for this. You could explicitly break up
your object into a series of layers, with each layer represented as a
triangle mesh, but that would kind of suck: you'd get a huge file, and you
might run into some limits on model size (either OpenSCAD or the slicer
might choke on the number of triangles). There might be a clever way to
encode this in AMF, where you configure the slicer to generate alternate
layers of different materials if it sees [something clever] in the AMF
representation, but I don't have a specific proposal.

It's easy to see how to do this with the SVX file format, since the object
is represented as a stack of layers.

I'm quite enthusiastic about SVX, because it's so simple and yet so
powerful. It should be a lot easier to write a slicer that converts SVX to
gcode than to convert STL to gcode. I'm not sure if anybody in the open
source community is working on this yet, but I think SVX support will open
up new possibilities for multi-material printing on open source 3D printers.

On 22 May 2015 at 04:45, biskero <biskero at gmail.com> wrote:

> Ciao,
> I read the thread and looks very interesting. I am new here so hopefully I
> am not out of space in what I say! :)
> I am building a large 3D printer with multi materials and I am interested
> in
> a Openscad solution to this.
> So the first idea that would come to my mind is to have multi material per
> different layers based on a simple %. Let say you have an object with hight
> or thickness of 10mm, I would specify to have 25% layers alternate the
> materials between the one you choose. Does it make sense?
> Right know I have a very large object 1000mm and I need to alternate 2 or 3
> materials based on layers so that I would have a sandwich of 3 layers with
> 3
> materials.
> Isn't the AMF format suitable for that?
> Thanks in advance!
> --
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