This is a shower wand holder that attaches to the shower wall via two large suction cups, which must be obtained separately.

The suction cups I used have an overall (relaxed) diameter of 62 mm, a button/head width of 14.5 mm, and a button neck diameter of 8 mm.

The "head" and "neck" are inserted into the back of the print keyhole slots, which fit the neck but stop the head from falling out. Gravity holds the wand holder on the suction cups after they are stuck to the wall.

When printed in the configuration shown, no supports are necessary.