This sandal is like a flip flop but with a back strap for heel support! Its sole is contoured to the shape of a foot and very comfortable!
Directions: Scale to your foot and 3D print the right and left soles, as well as two of each strap (one for each shoe). To assemble, glue the straps into the slits already in the sole, as seen in the pictures.
Suggestions: The soles may need to be printed at an angle to fit in your 3D printer, but print with the treads facing downward, so that the supports are only touching the treads. The soles print best using a raft, and the straps print best using a brim. The straps can be a little tight so using a more flexible material, like NinjaFlex, will make them more comfortable. Also, feel free to uses shoe laces or any sort of fabric as your straps and glue them into the existing slits.