I really liked the idea of the “Complete me” cube with the heart cutout, but was having issue with print-in-place parts fusing and breaking. The original Easy Infinity Cube Fidget worked really well on the first print, so I decided to merge the two. The multi-part infinity cube has been scaled up by 1.34x to have each component cube be 2cm instead of the original 1.5, and I've added the heart cutout from the Complete me cube. 

The parts as printed are a very tight fit and take some work to put together, but move with only a nice slight resistance after assembly.