Water filter adapter (BRITA MAXTRA+ / Aquaphor MAXFOR+)

This model provides a basic adapter between the BRITA MAXTRA+ / Aquaphor MAXFOR+ filter format and a generic 20mm circular hole.

While the filters themselves have a slightly elliptical profile, this model assumes straight walls on these sections. This makes for a better grip on TPU prints, however PLA/ABS prints might require heat softening before first use to take up the tight-gripping final shape.

I have provided all the source FreeCAD1.3.1 files and even a dimensions reference sketch more accurate than what I have used in the final model. The reference correctly models the 220mm radius curves while the final model uses straight lines.

There are also two straps modelled as straight pieces but intended to flexibly fold when holding the filter from "falling out"

The model is presumably made for TPU, but you can force and adapt the models to PLA/PETG/ABS use-cases.

The 20mm circular hole the adapter provides is approximately what some kitchen taps have. You will have to think about ways to adapt that circular hole to your own unique use-cases. 

In case you haven't seen these filters in action yet (because you're a cheapskate like me who would never buy the official jug those are made to go in) these filters are made for streams of water barely faster than intense dripping and a feed pressure of 5cm water height.

This project was a bit rushed, because I was in a hurry while also being a first-time user of FreeCAD, which is why I'm handing it over in this minimum-viable state to be properly finished.