Radiator Hook — S-Hook for Towel Radiators (No Drilling, No Hardware)

Drop-on radiator hook that needs no tools, no holes, no hardware.

The big U at the top hangs over the main tube of a heated towel

radiator (fits panels up to about 36 mm thick). A straight spine drops

down in front of the radiator, and a smaller U at the bottom holds

whatever you want to hang — a folded towel, a wet glove, a shopping

bag, a key ring. The small U has a short vertical tip extension so a

hung item can't just slide sideways off the tip.

Prints FLAT on the bed as a single piece: every layer is the full

silhouette, so there are no overhangs anywhere and no supports.

Parametric source radiator_hook.scad) lets you change the top-U

radius, drop length, bottom-U radius, bar thickness and the tip

extension independently.

Size is tuned for typical European towel radiators, but every

dimension lives at the top of the .scad so you can re-print for a

different rail size or a chunkier bar in minutes.

Dimensions (defaults)

• Top U inner radius: 18 mm  (opening ~36 mm — fits most radiator top rails)

• - Drop (spine length):  64 mm

• - Bottom U inner radius: 17 mm (opening ~34 mm — holds a rolled towel)

• - Bottom tip vertical extension: 18 mm

• - Bar cross-section: 6 mm in the side-view × 20 mm print-thickness

•   (stiff, won't flex under a wet towel)

Print settings

• Material: PLA or PETG. PETG for a towel radiator where the tube

•   gets warm (low risk of PLA creep at ~60 °C).

• - Layer height: 0.2 mm

• - Walls: 3

• - Infill: 20% gyroid

• - Supports: none

• - Orientation: lay flat on the bed, silhouette face up

Print time ~1 h, filament ~25 g.