Okay guys.
The new prototype is perfect. I can't really find any flaws to it.
Maybe --if you really want to be super anal-- it wobbles a little more than the original. That is probably due to the fact the I use sharp edges instead of rounded. But, really, it's unnoticeable. I'll try to make some more tests to see if I can make it super firm, but I don't want to risk to make it scratchy (ie: hit the sides of the housing).
The frosted material one is pretty expensive, but the end result is really perfect.
The white one is standard ABS, it turned out very well, but the quality is lower. Also the stem inside looks a bit brittle. Anyway they both work.
The problem is that each material shrinks differently during the curing time. So I would need to make two slightly different 3D models based on material.
Also, to lower 3D print cost I could try to reduce the amount of plastic adding some hollow spots. That might help with pricing, but a new prototype would need to be done.
I'll try to shoot a video if I get some time.