Summary

[[ Update Aug 19, 2018
The first cap I printed cracked. I suspected canola oil might have reacted with the ABS, and made it very brittle. But I printed another using the same exact filament, and it has survived just fine for scores of uses. I like this thing...
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I like waffles, but not so much to wash dishes. One Tablespoon of oil is required for a small batch of batter.
This bottle cap has a one tablespoon (15 ml) measuring cup attached to it, so there's one less dirty measuring spoon to wash. Any excess oil drains back into the bottle.

This 48 ounce bottle of Canola oil is from Walmart, Great Value brand. The printed cap has no gasket and it will leak if the bottle is laid on its side, so don't do that.

Granted most people will need a different size cap for their particular needs, and that will require some custom design work, but the idea is universal.

12 grams ABS, 30 minutes.

In the event metric software misinterprets the actual size of this thing, use the included Metric file.