A wrench for removing the filter under a tap/faucet.
You'll need to snap off two metal blades from your cutter and insert them into the slots. Without the metal blades, the plastic wrench is not strong enough and strip.
The fitting is really really tight, I have included the original solidworks file so that you can re-size the wrench to suit your filter.
The author marked this model as their own original creation. Imported from Thingiverse.