This design is a fully printed suction cup with a basket intended to be fixed on a glass or on a bathroom mirror. The cup should be printed in TPU and the rest in PLA or your favorite choice of rigid plastic.
To function, the cup should be 100% solid and its bottom should be very flat and smooth. Structured printing beds and thick layers of glue, as well as printing defaults on the first layer will mess up the airtightness and lead to the cup detaching on its own after some time. I tried both soft (85A) and hard (96A) TPU and both can work but soft TPU works better.
You can also use PDMS on you printed cup to make a perfectly smooth surface and ensure that your cup will hold indefinitely. To do that prepare about 4 ml of PDMS (or any type of silicon), cast it on a glass or any perfectly flat surface and push the printed cup on top. After the PDMS is cured remove the excess: your cup is ready.
I will soon make an instructable tutorial to explain in more details.

You can use the suction cup to hold anything you want using a metal hook or a cord, but i designed a basket and an arm to hold it rigidly. You can choose between different types of baskets, V1 is reinforce (thicker in the weak part), V2 is more slender and V3 uses another style.