I sleep on a lofted bed, and there is nowhere to store my phone. This adapter hooks on to the planks on the bed frame to hold my phone. This design fits any phone and can be secure with just two pieces of tape.

I designed this to not need any supports and it is a very straightforward print. I just recommend using adaptive layers or “make overhangs printable” settings in Cura to help with the filet if your machine is not well tuned.