This is a variation of the Infinity Cube. No assembly required.

To be printed with 0.2mm layer height and 20% infill.

If the model appear to be too restrained in the joints after printing, and using it does not fixing this, heat your bed to 65-70C, place the cube flattened on the bed with a cloth over for 10 minutes and then wrickle it to get make the joints loose enough for comfortable use.