That seems like excellent advice. Thank you for clarifying that the algorithm does the right thing. I'll examine each of those areas and try to find the problem.
I've been successfully using Mattercontrol to prepare and slice a number of 3d models. However in trying to print the Catan borders at https://www.thingiverse.com/thing:300229 I discovered that the pieces did not fit together. Looking more carefully at other pieces I've printed, I've come to the conclusion that the slicer seems to have run the extruder along the *centre* of both inside and outside edges, rather than on the solid-side of any edge. Thus using a 0.4mm nozzle, a 20mm diameter bobbin with an 8mm hole in the middle will print as a 20.4mm bobbin with a 7.6mm hole in the middle, due to the 0.2mm error on every edge. I'm using the built-in slicer.
Is there a means to configure Mattercontrol so that the slicer will position the nozzle correctly?
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