Not to jump the gun, but I heard someone on the PhlatLab show ask how many props a gallon of resin would print. Here is a comparison just for reference that may give you a rough idea of how far a gallon might go.

1 US gallon = 3785 ml (thank you Google)

The alien head that Mark showed on the show is about the size of a baseball. The guy that printed it said it took about 60ml to complete. Attached files

 

Awesome! That means a gallon would make 63 of those skulls. That would make a lot of props.

 

Good info George. Thanks.

 

Found this and many more materials that seem to have come a long way in engineering since the days of brittle parts. From what I found you can go from durable plastic like polymers to soft rubber pretty much every shore hardness out there. There are even some with wax introduced into the polymer In some cases I have seen metal that can later be baked to fuse it together.
Here is a company that produces a lot of different materials and may help to gain a better understanding of what is possible (at least from them) Some are for laser sintering and not sure if they would work on the stereo lithography machines, they may
http://www.agile-manufacturing.com/3D%2 ... Materials_








I found a video where they replace an aluminum injection mold with one that was 3D printed on an assembly line. It works perfect!




SI500
SI500 is an extremely durable photopolymer that produces parts with mechanical properties similar to those made with ABS plastic, including ultra-smooth surface finish, sharp details and mechanical performance uniform in all directions.

Materials Performance:

Tensile Strength: 6240 PSI (43.0 MPa)
Tensile Elongation at Break: 4.50%
Flexural Strength: 8740 PSI (60.2 MPa)
Flexural Modulus: 263 kSI (1810 MPa)
Hardness: 86D
HDT (0.45 MPa): 132.3 F (55.7 C)
HDT (1.82 MPa): 116.3 F (46.8 C)
Prototypes built with SI500 are typically used for the functional evaluation of plastic part designs. Applications range from simple ergonomic evaluations to stringent system performance tests because uniform mechanical properties rival the performance of injection molded parts. In addition, the material flexibility of S1500 accurately reproduces snap fit features for design evaluation.

I see the pricing going down in the future as the market becomes more competitive

 

Your welcome George Its awesome to see all the different materials out there now. I remember going to a trade show and getting a 3D printout from a powder based machine and it is very brittle. Comparing the materials they have for the lithography machines is just unreal.
Mark and Trish

 

http://www.agile-manufacturing.com/3D%2 ... Materials_
That's some good info to know as a guide line. :ugeek: