Gravity Towel Hook for different sized Heaters

Want to support my work or sell my 3D-printed designs?MembershipPurchase commercial License here! The towel holder can be easily clipped onto typical bathroom heaters with horizontal pipe crossbars.This is a gravity hanger that works using a clever mechanism involving a marble. When pushed up, the marble slides out of the way, allowing a towel to be placed in the gap created. Once released, the marble slides down against a ramp, creating a pinch point that holds the towel in place. This works best with a small sideways movement. I have created three different sizes of holders, as I noticed that there are often small variations between heaters. You can easily find the right size by measuring the diameter of the pipes and the distance between the top edge of one pipe and the bottom edge of the next.Large: pipe diameter = 24 mm, distance between top and bottom edges of two pipes = 26 mmMedium: pipe diameter = 23 mm, distance between top and bottom edges of two pipes = 12.5 mmSmall: pipe d