It would help to have a specific question and/or show us an example of what your mold will look like.
The first obvious thing to me is that your first layer Z height is going to be very crucial and will probably take 4 or 5 attempts until you have the print bed at the perfect height.
Another thought is you might need a smaller nozzle hole size. Right now the UM comes with a .4mm or 400um nozzle diameter. If you print for example a square, the inner corners will be quite sharp, but the outer corners will have a .2mm radius (.4mm diameter = .2mm radius). See this thread for very visual, very clear explanations of the problem of printing small things:
http://umforum.ultimaker.com/index.php?/topic/2717-cura-xy-resolution/
Also be aware that although using a .25mm diameter nozzle hole will greatly increase the resolution of your print, there is a much higher likelyhood of clogging your nozzle. So print quite slow! I would stay under 10mm/sec and I would also modify the start/end codes to not extrude so fast before the print starts.
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ian 32
i know it maybe not the help you need... but why not read around the ultimaker forum first for a little information, then ask some questions ??
might work better than... i know nothing... help.
Best wishes.
Ian :-)
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