Hanging box for bathroom radiators/towel rails. Can be snapped on Towel rail. Top cover can be opened and box detached. Can be used as a storage box for cosmetic pads ore some other items or as a trash bin. 

Dimensions of Towel rails/radiator are 20mm diameter of pipes, 40mm distance between pipes.

Top cover is attached using small piece of filament 1.75mm. When the top cover is opened, box can be detached by moving slightly kupwards and pulling away.

Instructions:

print two hangers, one cover and one box. Attach the top cover to the hooks by inserting small piece of filament through the hinges. Snap the hangers on the Towel rails.