Metal crystals easily can be grown via electrochemical pathways. Copper is a great example of this. I recently had an idea of growing those crystals in controlled ways (i.e.: surrounding the electrode on which the crystallization occurs with a "mold" of the desired shape with holes in it) but these crystals are tending to grow towards the another electrode in the shortest way possible. Let's say that I would like to grow a copper tetrahedron on a triangular copper plate surrounded by plastic sheets which are controlling the crystal growth.
The problems which I came across:
1. How should I arrange my equipment to get the crystals fill the mold?
2. Shold I worry of liquids being trapped in the crystal?