Echoco, thanks for the responses on the 3D modeling and printing. I'm in the US so Shapeways is good for me. We've used Shapeways twice--for the same shape. Little lab vial racks with places for magnets for doing work with DNA and RNA are silly expensive, like $200-300 each. We printing a couple at Shapeways and, including the rare earth magnets, they were $30-40 each, IIRC.
Some of the difference on the pictures may be the scene setup--your setup for your original pictures is deep, 3 or more minis deep and from above-ish. Try setting up one base (or a short line) and take the picture more from the front than from above. That is part of the reason your later photos came out so much better--a single layer to focus.
The light tent seems silly, until you have one. If you're having any sort of focus issue, the tent takes care of it. It also gives you more control over shadows and the one I have came with 3-5 different background colors to use.
I have a point and shoot superzoom camera with image stabilization, so tripod or books don't seem needed. If I leave the camera on "intelligent Assistant", the camera seems to switch to macro mode. I'm going to try playing with the background color, the exposure (making the image brighter), and use Aperture-priority mode (to change the f-stop, I think, to make the depth of focus shorter, so it focuses even more on the minis and less on the background) this weekend. The f-stop should make the image brighter too, so the camera is looking at the brightness and colors for the minis and not the background.
I usually take wildlife pictures in the field and do not have time to mess with any settings and just use outdoor sport mode with a small focus area, so this is all new to me too.

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