Hello!

Can all the plastic pieces of the carthesian be produced with only one printhead with polymorph or is it necessary to use a filler material, i.e. two heads?

I'm thinking especially of the swiss-cheese corner pieces...

I believe everything can be made with one head. I read somewhere, that I can not find again, that the corner brackets have tear shaped holes and other clever features that allow them to be made without support.

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[www.hydraraptor.blogspot.com]

aha I see, is it the "V" of the teardrop that is printed on top?

So it is possible to make hollow shapes as long as the angle is not to steep (i.e 45 degrees)?

Yes, there is an example at [blog.reprap.org]