A 3x3x3 that can only do 180 degree turns on all faces has already been made by Hidetoshi Takeji and a variant is for sale in Oskar's Shop. A variant where only one axis allows 90 degree turns has also been made.
However, the remaining variant where only one axis is constrained to 180 degree turns has not been made yet. It was of course Andreas Nortmann's request to make one.
This puzzle represents a unique challenge in it's design: the half turn only cube can be made by bandaging a 7x7x7 and the one which is constrained on two axes can be made from a 5x5x5. This can also be seen as using different proportions for the cuts of each axis. However, the variant where only one axis is limited can not be made this way because the moment you make just the cuts of one axis disproportional two axes are instantly limited.
My solution is to work from the centerpieces, adding internal parts that block illegal turns. This mechanism could be used to construct many other puzzles, like a Helicopter Cube that does not jumble. If Adam Cowan were dead, he would turn in his grave so I will not be doing that.
Buyer information & Claim your free set of stickers
This puzzle comes as a DIY kit. You will need to assemble the puzzle yourself and also provide your own screws. A free set of printed stickers is included, please send me an email
after buying to claim your free stickers (I ship them separately, they're not included in your order from Shapeways).