I'd appreciate some pointers on how to make a mould.
I had some orthotic shoe inserts made, they're of pretty hard plastic.
I'd like to make a few more pair, as they're very expensive to buy, custom
Could I make a mould myself at home, then pour in plastic, and make them
I'd appreciate any tips on how to do this, and where to buy the plastic. I
guess Plaster of Parris isn't too hard to find.
I'm not aware of any plastic that you could mold at home that would
stand up to the abuse shoe inserts need to survive.
If you want mulitple inserts, you are better off spending your time
negotiating with your orthotist and shopping around.
Greg (modeler and mechanical engineer)
Actually there are a number of resins that could be used at home to
replicate them that have the correct propeties. The drawback is you
shouldn't try to DIY any kind of medical device, just generally a bad idea.
Caulk is soft and flexible, it'd make a poor substitute for the hard
plastic of his custom-made orthotic shoe insert. It's also too thick to
pour and cures on exposure to air, so it won't work in a 2-sided mold or a
deep 1-sided mold.
I have to agree with Greg's & Ron's advice: Do NOT try to duplicate an
orthotic shoe insert yourself. Leave it to the orthotic experts, they know
what the requirements & tolerances are for that insert, and we don't. You
could waste a lot of money on experiments and never get it exactly right.
There used to be a mould kit available for making tin gaming pieces. A
mate of mine used to have the stuff for making Dungeons & Dragons
characters. It resulted in a cast being of relatively hard rubber that
could take molten metal and would move enough to allow the tin or alloy
piece to fall out.
I've just done a search and found this;
Go for it, you paid for the deisng and fit with the original insert. Refer
to details available at
Mold, Cast & Vacuum Form items yourself FAQ inc pictorials (see also
Fibreglass etc section)
Fibreglass Techniques & Information
Model Car Tech
Molding & Casting
Plastex = Plastic Repair or make copies of parts - Kits
Vacuum Former - make you own and usuage.
Vacuum Former - email Alan for home made & DIY canopy etc.
Vacuum form - Pictorial instructions _ click thumbnails for full text.
Woodland Scenics - make latex molds, cast plaster etc
Alan's Hobby, Model & RC Web Links
Guys, guys - you're missing the point!
There is more to an orthopedic device than shape. This guy doesn't
want to make a MODEL of an orthotic insert. It's got to FUNCTION as
well. We can assume that he has already tried over-the-counter shoe
inserts, so he must have some serious problems.
To work properly orthotics need to have the same stiffness, elasticity
and durability. His feet are screwed up NOW. He doesn't need to
experiment walking around on a bunch of crude copies that are like
boards, or mush, or rocks, and which fall apart in a few days or
If orthodics could be made cheaper materials, they would be. That's
how the marketplace works. If "Zzaaarathustra" thinks he's being
ripped off, he should shop around and negotiate - not start a second
career and subject his feet to further torture. In the long run it
would be a frustrating, painful waste of time.
I've got enough stuff on my workbench to mold copies of my teeth. But
I don't think for one minute that I should make my own crowns.
Strangely enough I've just sent an email to a mate of mine who used to
use all sorts of stuff for film work. I should have red your post first.
I'll ask him as he lent me a book on the subject!
Surely you mean very slightly flexible otherwise it might snap ?