Long time designer, but mostly either metals or 3D printing. I've been studying PIM some, including design guides from various resources, and have some projects coming up converting from 3d printed to PIM.

I see published wall thickness ranges for various materials, which basically says if not fiber reinforced then pretty much all materials should be less than 1/8" or even much less. I infer that this is partly for warping and likely other bad effects.

But what if the part is shaped more like say a fat toothbrush handle, could you then get away with making it out of say ABS? What might be the detrimental effects of doing this? Is it common to go over the recommended max thickness some if the part is symmetrical and/or not wide in any direction?