Hydration bladder bite valve dust cap / cover

thingiverse

This is a dust & dirt protector cap for a hydration bladder. The cap has an internal diameter of 19mm which fits the Mountain Warehouse Wide Opening Hydration Pack 2L but can be scaled up and down as required. It attaches with a cable zip tie as shown in the photo (6 inch / 3.6 mm x 150 mm). Obviously, if you scale down you will have to use a smaller tie or file out the hole slightly. There is a long version which prints slightly better due to orientation and requires less flex. The downside is, when removed from the valve you have an 100 mm piece of plastic flapping around. Recommend PETG or PLA Flex filament or similar. May need a brim depending on your bed adhesion. I tried merging my design with some existing cable tie Things but either the orientation ends up being out by 90 degrees if you print flat or you need supports. Plus, I had plenty of cable ties lying around.