This is a simple hook that can be attached to wall (door, cabinet) with double-sided adhesive tape. No support require.

First, I designed a simple hook that can be mounted to various surfaces using 19 mm wide double-sided tape. Then, I created a safety version of it, featuring a small latch that prevents the hung object from accidentally falling off. Both versions can be printed without supports. The safety latch might be a bit stiff at first after printing; it just needs to be moved back and forth a few times to loosen up.