Water filter wrench

thingiverse

This wrench will fit the Model #GX1S01R housing to enable filter replacement, they sell an actual wrench but with a 3d printer it makes no sense in spending money for that. I scaled it in cura to 100.6% to account for filament shrinkage, you could scale it slightly larger as it does not go all the way to the end of the fllter housing, but it has enough fit to do the job, your choice in how you want to scale it. Without any scaling it should still work.