Summary

This Sandals are printable with regular printer with XY format 220 x 220 mm. They are bent to fit printer, where it naturally bends while walking. They will stay little bent even over time but it doesn't bother while wearing. Left side, mirror it in slicer.

Sizing:
100% Scale is size 44 - 45 UK. You can scale XY (I would measure height of foot to scale Z)
Here is example to scaling

96% - UK 43
93% - UK 42
91% - UK 41
89% - UK 40

It is not tested.

Print settings (Cura):
Printed with stock ANET A8, with Gembird TPE Flex (in Cura filament: XYZ printing - TPE - Flexibile).Position on side or flat as natural position with full support, even support is hard to remove, they are less slippery. Printing speed 25 mm/s for all speeds (even infill etc.. travel 50mm/s) Support touching build plate, tree. Infill: 15% Gyroid.