On Wed, Mar 29, 2017 at 1:00 AM, Erik Christiansen <dva...@internode.on.net>
wrote:

>
> Where the 3D printer would be in front is forming nice fillets, as in
> the transition from a boss to its supporting surface, and inside a
> pulley rim, going to the spokes. With foam fabrication, it may be
> necessary to affix a square cross-section ring,


You forgot the #1 thing a 3D printer can do that your hot wire foam cutter
can't.   Let's say you want to cast a likeness of a bald eagle standing on
a ball.  Or a rose vine wrapped around a handle for a set of antique drawer
pulls and any other kind of decorative metal castings.

Decorative parts tend not to be geometric and many times they incorporate
likenesses of natural objects like animals and plants or even human faces
in relief.      My father had a collection of cast iron objects for the
1800's and early 1900's and most of these could not be made with a hot wire
cutter.  things like a bird cadge like string holder and very ornate legs
that were popular back then.  Like.ey a skilled word carver made the
patterns.  today I'd thing a 3D printer would be used.

You don't even have to get into decorative parts, look at the cast handle
of a utility knife.  There are no flat and no parallel sides and all the
curves are compound.






-- 

Chris Albertson
Redondo Beach, California
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