Radiator Knob Cap

thingiverse

I searched online for round caps to sit on top of the exposed pointy knobs of my radiators, but could only find angular ones which were also rather unattractive. So I decided to make them myself. The design is very minimalistic and requires only a rubber washer to secure the cap onto the radiator knob (see post-printing for details). Since I don't own a printer (yet :-), I had the excellent Crash from 3D Hubs (https://www.3dhubs.com/service/kresimir) print the caps for me on his Ultimaker. On his good advice, we used Colorfabb Copolyester HT (http://ht.colorfabb.com/) to make sure the caps can withstand the radiators' high temperatures. Print Settings Printer Brand: Ultimaker Printer: Ultimaker Original Rafts: No Supports: No Resolution: 100 Infill: None (hollow) Notes: (1) As the caps sit on top of hot radiator knobs, they were printed with Colorfabb Copolyester HT for high thermal stability and durability. NB Make sure that the filament you use can withstand your radiator's max temperatures! (2) The print was done with no infill & 2.4mm shell thickness. Post-Printing After printing the cap, insert a thick rubber washer (20mm Outer Diameter, 6mm Hole Diameter, 4-6mm Thickness), and then push-fit the cap onto the radiator knob. If you use a washer of the above dimensions, there's no need to use glue. How I Designed This For the initial design, I used Google SketchUp with the dimensions scaled up x100. I then used OpenScad to scale the model back to actual size and verify the design.