Simple loading tool to assist with the loading of magazines and save stress on thumbs over long periods of time, as well as remove the need for any fine motor skills to make it easier to load magazine in the cold/with gloves on which was my main areas of concern.

Drop ammunition into the loader with the flange facing the rear of the magazine, and push down/rotate the center piece to load ammunition.  

The closest commercial equivalent can be found here:https://www.midwayusa.com/product/1015161542 at a price of $26.95 at the time of writing this.

Printed at 30% infill, this uses ~29 grams of filament, which assuming $20/kg puts it at 58 cents worth of plastic, and a 1/4" clevis pin from the worst case pricing at mcmaster carr costs 27 cents, putting the total cost of this at 85 cents worst case scenario.  The inside of the body has been chamfered to eleminate the need for supports.

I have printed my final version on a $13/kg roll of filament I got on sale that brings the cost down further, the dimensional tolerances on this are not super tight so cheaper filament can be gotten away with.

Along with being cheaper to buy a roll of filament than a commerical equivalent, this also comes with the benefit of being able to scale it to fit .308 Pmags, or resize it to fit any double stack double feed magazine that may not have a commerical equivalent loader in existance.