Thanks, Blind
I have a few components built, however I hope to have the whole thing worked out soon... So it's not yet functional.
I can show a "fixture" I've made - this is what I'll call an 8x2 (8x 2"x2"x1"deep cells with which to cast a radial-mold).
Other fixtures I have drawn would include 4, 5, 6, or 8 cells, in either 2" or 2.5" squares, which I can make out of various thicknesses. I've calculated the 8x2 to be the most cost-efficient, considering almost all of my pieces can be made within 2"sq.
Each of the 2" square will accommodate 1 miniature up to ~40mm wide and about 60mm tall, or, may support several small objects/pieces. The castings are made through "conventional" means (first pressed in clay, and pouring two-halves of silicone, each 1/2" deep) to form a full cast of a 1" deep mold, including all cells at one time (including a "gate" disk that's molded into it at the same time the mini's are cast).
The mold itself need not be placed back into the fixture when spinning - it'll be sandwiched between two disks in the spinner, so this mold can be used over and over.
I had calculated the volume of silicone needed for something like this, to require a bit less material than if using a circular mold. Cost-per-mold for an 8x2 would be about 1/3 that of the "sample" size Oomoo 30 (which is all I've had experience with, yet). So, assume ~$7.50.
Compared to Natural Rubber used by high-volume casting, the cost-per-cast is about 1/4 that of 9" casting disks (
http://www.conquestind.com/s_s2.php)