Articulating hand warmers

A pair of hinged hand warmers :) These hand warmers can be fitted onto the hands of your partner to keep their hands nice and cozy. Nice and comfortable, have been tested for 4 hours in one go! Unescapable if sized correctly.
STLs provided are for your left hand, mirror in your slicer for the right hand. These are for a medium sized hand, you will need to scale the item for larger or smaller hands.
You will need 4 M5 plain nuts which you can glue into the hex shaped recesses, 4 M5 x 16 socket cap bolts and also 2 M4 x 70 bolts and 2 M4 nyloc nuts (or alternatively two pieces of M4 all-thread and 4 M4 nyloc nuts and washers) for the hinges.
I printed at 0.2mm layer at 0.4mm width with 2 perimeters and used 20% infill for most of the mitt but used 100% infill for the areas around the hinge and also around the fixing bolt points for extra strength.