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Is it possible (within reason) to reduce the size of a cast of a model, and create an identical copy of a model on a smaller scale (in this case 54mm to 28mm)? Thanks, any input welcomed!

i do believe they laser scan the model in then shrink it down using computer software before sending it off to be turned into a mould =D

yeah, I would say that it would be difficult without a good 3d scanner/printer setup. Perhaps there is some miracle modelling compound that shrinks well with heat? (think shrink-a-dink) If it exists it would probably be pretty expensive, as the physical chemistry in creating something that would shrink uniformly would be complicated. It would also have to have no impurities and no air bubbles which would make working with it a little more difficult. I think your best bet is to just try and convert/sculpt something at a smaller scale. It would definitely be cheaper!

Professionally, models are reduced either with a 3D scanner and software, if the mold is to be CNC cut, or with a reducing tool and tiny cutting head (an inert stylus is connected via asymmetrically hinged rods (in it's simplest, lowest-tech form) to a cutting head that mimics it's movements at a reduced scale - the stylus is traced around the contours of a negative mold of the subject, while the head cuts the casting die at the reduced scale).

I know that some casting materials do shrink when drying/curing, but the process of reducing scale by nearly half would require several successive rounds of casting and remolding, as well as relying on the assumption that the parts will cast perfectly and shrink uniformly, each time, which is unlikely.

So, to answer your question, it's perfectly possible, but it's well beyond the scope of even reasonably well equipped hobbyists.

Ah OK, thanks for the help guys. It's no big deal really, I'll just have to try and convert...

Look up Hydrospan and Hydroshrink.

~Eric