Model originally uploaded to Thingiverse at https://www.thingiverse.com/thing:4929927.

Not wanting to wait for the delivery from Aliexpress I searched for a design to print. Found that one from FLA_Labs and liked the idea. But I don't like fillets by design (chamfers get rounded some anyway) and also the thin outer hinge eyes (please correct my terminology...) so I recreated it from scratch. FreeCAD file is mostly parametric by changing the DynamicData (dd) variables. The STLs provided are for a 20mm single cube size and 5mm wide, 3mm thick connector. You will heed 4 normal cubes, 4 mirrored cubes (any slicer should have that function) and 16 connectors. I printed mine in groups - 1 cube, 2 connectors. You might need a small drill to clean the holes for the hinges. 1.8-2.0 mm should do the trick. For the hinges I used 1.75mm filament. Stick a piece in the hole until it protrudes about 1mm from the other end. Heat that end with lighter, soldering iron, ..., press to form a rivet head. Cut other end about 1mm, repeat to form the other rivet end. Or you could cut them flush and add a dab of superglue to fix them in place.

Check Vertical-Joint-Flipped Yet Another Fidget Infinity Cube v2 for another way to connect the cubes. The second one (blue/yellow one is assembled like that)

Added Trapezoidal piece for recreating the Cut Kobayashi Fidget Cube (Infinity Cube, parametric) design.

Please any comments,, suggestions, ... are welcome. Please share your makes.