About this 3D model
Wedge sandals size 4.5 UK (233mm foot lenght), insole lenght is 236mm. If you want different size just scale it up or down in slicer. You can use ribbon through hexagons to lace it up. (100 / 233) x [your foot lenght in milimiters] - 100 = [how much percent you need to add] I didn't tested it, but it should handle weight very well. I would say 3 layer wall with 0.8 nozzle 15% infill should be fine. Should print well with no supports feedback is always nice to see, i can make some tweaks. Use at your own risk.