Wall hook - double sided sticky foam

thingiverse

Use 2mm double-sided foam tape for optimal results. This material develops a sharp point after printing, which can easily be trimmed to size and rounded over with a flame. To ensure accurate printing, position the object upright on your build plate, optionally adding a brim as needed. Supports are not required for this design. However, if you prefer to print it sideways, consider using supports for added strength.