Vent Cap Wrench for Basement Watchdog sump battery

thingiverse

My Basement Watchdog sump pump backup battery has vent caps that can be somewhat tight and hard to turn. I top off the cells with distilled water every 6 weeks. This wrench makes the job much easier. The example shown is HatchBox Red PLA, printed with 15% infill, 5 perimeters minimum, 5 bottom solid layers. At 35mm/s it is a 3-hour print with the 15% infill. Darn it ! The first time I used the wrench to top off the battery, I discovered that the yellow cap that holds the level sensor rod has SIX ribs instead of EIGHT ! Why they make them different I have no idea. I don't really want to print another wrench just for that yellow cap. That cap turns fairly easy on my battery anyway, so I will just keep doing that one by hand. Update 12/4/2017: I uploaded a version of the wrench that should work with the six-rib cap as well as the eight. I have not tested it, and I don't know how strong it will be with only two blades, but it is there if you want to try it.