The slice form wedding bell and slice form heart have similar directions as the slice form bride. Please refer to those directions to http://papercraftetc.blogspot.com/2017/03/slice-form-bride-and-groom-cake-topper.html Slide one slit into another...first the bottom slit and then the top slit...stacking them one on top of another as you go. Tape the outside edge and then glue to the backing. I use two backings to give it extra support.
I then decided to modify the height of the arc by decreasing its size. In doing so, I discovered that I had to increase the width of the band to accommodate the difference. These modifications of the original triskele design resulted in a cube.