Bitterman wrote:The "scaled up" arms - 3D printer, or...? The bubbles (which I'm sure you can fill) lead me to assume they were cast somehow, but I'm not sure how you'd cast something larger than the original.
Click on his image, you will see the other images and the custom made arm with plasticard and plastic bits.
Ninja'ed by OP...
Bubbles can be eliminated in casting by some means:
- Not stirring too rapidly the resin (cavitation leads to bubbles created in the liquid resin)
- precoat the mold with a thin layer of resin before closing the mold and fill it with the rest of resin
- small quick hits on the filled mold to detach bubbles of the mold
- put the mold in a vacuum pump to suck the bubbles out
modelglue wrote:Bitterman, I have never tried this but I have read that molds can be expanded (or grown) up to 200%.
One of my stealth legs mold (created in silicon mastic for bathrooms) shrunk by 20% three month after being created and I used it to create Firewarrior sized Stealth legs for a Fireblade.