Tool for the capping and recapping of FluidX 1ml internal thread tubes/vials

The lab where my wife works uses these FluidX tubes. The tool provided by the makers is an absolutely useless tiny piece of injection moulded plastic. If a cap was slightly tight for whatever reason, there was a good chance of breaking the tool. They were going through one or two of them every month. 

I made this tool for her, and they have been using them for more than a year now, and are very happy with it.

I've included three different size of handle, as different people in the lab prefer different versions of the tool.

I have printed these in PLA, and also in resin, and they all work fine.