Vertical wall hooks (x2 - x3)

Yes, it is ideal to have the hooks side by side but sometimes you cannot drill holes on the wall as you like (when you rent for example). However there may be existing single hole with a screw and you may want to utilise it with at least 2 hooks. Here comes the my design to the problem, you can even use the 3 hook design with single screw if you need to. Screw holes are for M3 counter sink.

I use PLA for indoor and PC/PETG for outdoor that seem to work well. Standard 2 walls with 15% infill does the job. No support needed.