Close-to-cast price are achieved by printing only the outer shell with an extreme thinness. The models are, of course, not as sturdy as a cast model could be.
Glad to see you keep faith in my work and removed towels from the Stormsurge crew wargear (unless they plan to travel the Galaxy).
Some infos (more by the end of September I hope):
I ran some test on the thin versions: they are surprisingly sturdy for their thinness. I test glued an arm in place with the long gun underneath, and pushed the tip down. Super glue broke before the models, even if the elbow was a little distorted under the constraint (around 1N or 100g force on the gun tip, roughly the force you need to put a pin in a wall).
Surface is strangely corrugated, but I suspected this came from the machine orientation they choose for printing. A good sanding and everything is better.
Also, I recommend to clean the remaining wax carefully from the model, because the thin version seems more waxy than the thick: a bath in a 50-60 °C water (beware to not let the temperature be over 60°C else the Frosted resin will soften and bend), dishwashing liquid and a toothbrush are good.
I posted a test model on Shapeways to compare prices: http://shpws.me/MESs
You can see the savings by swapping SIZE (over the item price) from Extra-small (=thin version) to Medium (thick version)
This item, and other prototypes could be ordered, see my shop inventory. Until I clean this topic and my shop and maybe review a little the models, thin versions and combo will be put on demand (PM me) on Shapeways.