Your cats never have to settle for substandard food portions again! Now, instead of getting 2/5 or 5/16 of a can of food, they can get precisely 1/3 of a can! Even better, they can get multiples of 1/3 dished out precisely as well. 1/3, 2/3, yes, even 3/3 of a can of food can now be precisely dished out! Download yours today!

There is a 3 oz and 5.5 oz version (common US sizes), plus an OpenSCAD customizable version that will work with the customizer if you have a different size can or different portion requirements. I've only printed and used the 5.5 oz version 3 portion size. The 3 oz version is based on some reconnaissance at the pet store, so may be a mm off. Let me know so I can fix it, since I wasn't willing to pay $1 for a can of cat food to verify myself. And my cats only like 1 and 1/3 cans of food per meal, so I never bothered to try the cat food quarterer or cat food sixther.

Notes on food safety:
3D prints are hard to make truly food safe, so use some caution here to keep your kitties safe and healthy.

Use a food safe plastic.
Constantly wonder if the nozzle, hot end, filament guides, spool, and filament maker, are all also food safe.
Coat the whole thing with a food safe coating to fill in the gaps left by your printer and keep that questionable plastic away from the food.
Just make a mold and recast in a food safe resin.

Update 2016/05/16 : Updated summary, Added 3 oz and OpenSCAD/Customizer versions.