Shower caddy hook adapter for a 19 mm shower rail
An adapter that lets an over-the-showerhead caddy from Simplehuman, OXO or IKEA hang from the vertical riser rail instead, when the shower head is too low or the caddy hook is too wide for the hose fitting. The clamp wraps a 19 mm rail, the common size on Grohe, Hansgrohe and Mira slide bars, with a 19.4 mm bore, a 4 mm bolt and two 3 mm rubber pad recesses. A 25 mm wide hook on the front takes the caddy's own hanger, which is usually 20 to 30 mm across. Walls are 4 mm in PETG; print it in two halves lying flat and join with an M4 stainless bolt.
Rails come in 19, 22 and 25 mm and caddy hangers vary, so an adapter generated to your measurements holds a 3 kg loaded caddy without slipping. In SpeakCAD you give both sizes, preview the adapter in the browser at no cost, add a second hook in the chat and download the STL.
Create a two-half rail clamp with a 19.4 mm bore and 4 mm walls, 30 mm tall, closed by an M4 bolt with two 3 mm recesses for rubber pads, with a forward hook 25 mm wide, 15 mm deep and 30 mm tall for a shower caddy hanger, for a 19 mm shower riser rail.