There are a ton of amazing designs i'd like to see realised in Shapeways form, would probably pay a couple of hundred's just to get my hands on all the pieces to replicate the Knight-like Tahu design where he's shown fighting Ikir... Though for the greater good i've decided to limit it to the most useful pieces, pieces that i feel would help the community if replicated.
Here are the three pieces i feel you should make;
Leg armour pieces;
A single design could be made and whoever buys it could paint it. This is used in concept art on Tahu, Kopaka, Pohatu, Lewa, Umarak and even a few other characters. The entire piece doesnt even need to be made, as you could just make the flame pieces that could attach to the current Star Wars CCBS leg armour. These are easily the biggest request given that they would enable fans to almost instantly make the 2016/2017 alternative Tahu art.
Mask Of Ultimate Power;
I've went with this specific design because i feel its the most neutral, neither evil or good. It looks both wise, but somewhat creepy at the same time. The design of the mask would need to include the elemental pieces curved spikes heading backwards round the sides - but it would enable fans to buy multiple's of the mask to paint in the varying combinations.
Presumably this would have acted similar to the 2006 under-mask for the Toa, however i feel it could be popular as a potential Mask that the Toa could wear when going to the shadow realm or other environments such as space or under the ocean. Once again, the spikes would enable fans to paint them however they choose, to represent the Toa they like or whatever. You could even buy a translucent/transparent version of the mask enabling you to see the Bionicle head underneath for a creepy look.