2013/10/1 Erik Friesen <e...@aercon.net>

> Were you using aluminum?  What type of draft did you use on the moulds?
>
>
Yes. Usually splitted molds or ejectors in the bottom that could be
manually knock the piece out. Another simple trick is to drill a small hole
and plug it with a tiny bit of clay at the mold side. Then you can pop the
piece out with compressed air.

Draft, depends on the part but with a ejector pin or two and a splitted
mold you can go vertical. I recently made a few parts with no draft and
molded in epoxy.
http://farm8.staticflickr.com/7152/6686837519_9a8b65926b_z.jpg
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