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Originally Posted by Richard
I've been reading this part of the rules carefully for several years now. It does not say that you only have to account for the amount of material you actually use. It says that you have to account for the cost of the smallest commonly available unit that satisfies the need for the item. In the example above, the smallest commonly available unit is a 1' x 1' sheet, so the team must include the cost of that sheet, not just the 10" x 10" they actually used.
In the case of SI40 resin, the smallest commonly available unit is 10kg. When a smaller unit (e.g., one liter for $250) is commonly available, I'll gladly fire up the Viper to make parts for 931.
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Another option for this example, Richard...
If a company who sells the service of making rapid prototypes can give you a quote for making 1 piece for under $400, and that is the commercially-accepted price, then a team could make a custom part on one of these machines.
For instance, I made our first plastic Omniwheel for AndyMark on a dimensions 3D printer that used ABS plastic as the material. The company who made this part for me charged me $250 for each side of the omni wheel. This cost covered their material usage, labor, and overhead costs. Anyone off the street could take a similar design, of similar size and get approximately the same price. As long as it's done during the build season, this would be legal, in my interpretation to the rules stated above.
Andy B.