PrintingFor the tool : - 2 outside walls - 30 to 60% infill depending of kid's care in his toys ;) For the buckles : - 2 outside walls - no infill Watch the video (https://www.youtube.com/watch?v=jQGB_Lkohvs) or follow these steps: 1- Crossing the elastic between the 2 bars 2- Add another one on top of the first without crossing 3- Put the two loops over 4- Put the buckle for later attachement. 5- Repeat steps 2 and 3...