Hot Tub/Spa Filter Cap/Retainer
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Replacement cap to hold filter cartridge.
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Updated at source:
Model information
- Source
- Printables
- Category
- Mechanical Parts
- License
- Creative Commons — Public Domain
ADDENDUM : When I originally made these in Aug. 2022 I had some concerns that PETG might not hold up well in hot chlorinated water. As I write this in March 2024 I can report that that the prints still look as good as when I originally made them, even though they have been immersed in 104°F (40°C) water treated with “chlorine granules.”
END ADDENDUM
This was made to fit a Hot Spring model “spa” or hot tub, but will likely work with other models of hot tub that use a similar filter cartridge. This is a replacement part which can be purchased for around $6 each, but why do that when you can print it for $1.25?
For reference, the cylindrical part of this print has a diameter of 48.8mm and a length of 66mm; the internal threaded part is 4.5 TPI.
I should note that I printed these in PETG, and I do not know how well it will stand up to the heat and chlorine of a hot tub. It's also worth noting that the original filter caps (after many years of use) show significant deterioration and “flaking” (which is why I made replacements - see photos).
The cap is printed in two parts so as to avoid the need for supports. The grip simply snaps into the cap.
Notes on choice of filament :
I chose PETG because it has a higher glass transition temperature than PLA (likely a poor choice). ABS might be a better choice.
Print Instructions
Print in PETG using the gcode and 3mf files provided. Otherwise :
- 2 perimeters
- cap : 10% rectilinear infill
- grip : 0% infill
CAD
The OnShape 3D CAD files for this are here :