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Unread 07-03-2005, 12:37 AM   #40
Etacovda
Cooling Savant
 
Join Date: Feb 2004
Location: Dunedin NZ
Posts: 735
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actually they work with resin, powder etc among other things

Theres 3 major types of rapid prototyping - stereo lithography, selective laser sintering and 3d printing - then of course CNC moulds cast into urethane pieces, and the like.

Stereo lith is done in a liquid bed, which 'falls' as each layer is completed by a laser (solidifying the photoreactive polymer) and eventually 'falls' into a finished part, which are then either shipped as out of the machine or finished to smoothness at the buyers wish.

SLS works with a powder bed, and a laser again - SLS has the benefit of creating parts that are more durable and do not require support for overhangs etc. SLS is newer than SLA.

3D printing is useful for even buying up and having yourself, however its still prohibitively expensive, and you are limited by material choice until recently. I believe theres ABS printers etc now.
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