Finally some time for updates.
The Mandalorian coins and the simple galactic credits turned out quite nice:
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But the ones with the transparent centers are still keeping me busy. Doing complete casts in red-tainted transparent resin didn't work out for me. Without the right equipment to degas the resin they just look to bubbly inside. So I went for my two-part method.
I had these acrylic octagons made:
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I made a two-part mold for the coins. I then poured a bit of the metal-resin mix in, inserted the acryl-part and used a weight to keep it in place:
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(I tend to pour any excess resin into these small beakers for that purpose).
The two mold-parts are asymmetric, so one part is much thinner.
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After the resin has cured a bit, I mix up another small amount, pour that in and squeeze both parts together.
(The resin I'm currently using has got a curing time of 3 hours, so I do this after about 1 hour)
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When the part is completely cured, I cut out the thin layer of resin in the middle and peel it off. (No matter how much weight I put onto the mold, there'll always be at least a minimal layer of resin on the crystal part).
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This way I can have a heavier, metal-cast body and still the plain transparent center. Though this is surely not the way the original props were made, I'll still stick to this method, because I like the result better.
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But there's still a lot to improve. I've already been told, that the red of the acryl is too dark. So I'll try to get some in a lighter red. And I somehow have to improve the process to minimize irregularities.
So if you people got any ideas for me, I'd be really happy!