These gears are angled at 45 degrees such that they can mesh at a 90 degree angle, on two perpendicular 3/8" shafts.
One has a standard keyway, the 'keyed' one I added the key into the STL.
I intended this originally for testing out ideas for a power transmission on a printer design, but benched the idea for a later date.
The ones in the pictures are lightly sanded, and I printed them slowly on about .3 density with .25 layer height. They mesh well but don't seem to align at perfectly 90 degrees, but slightly skewed, hopefully someone will have better luck than I did, I will revisit this at some later date.
Inventor File included for reference.