... run the STL's through Netfabb basic or another program, that can 'repair' not watertight object, so they will become manifold/watertight ...
Viktor
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Aufruf zum Projekt "Müll-freie Meere" - [
reprap.org] -- Deutsche Facebook-Gruppe - [
www.facebook.com]
Call for the project "garbage-free seas" - [
reprap.org]