Simples. You open one of those little tubs of tomato paste, you use half to make a meal, you press the foil lid back down, and shove it in the fridge. Two days later, you want to use the rest and get it - and there's biology taking place in there, lovely splotches of mold.

THAT is why I finally made and printed this lid. Simples.

NOTE: Tomato Paste Lid.stl is the first version, it's not drawn with smooth curves and I made it a touch smaller so it wouldn't bind in the tub, figuring I'd fix it up for the second draft - but this was good enough for the moment. I'll smoothe it out and increase the diameter by a millimetre and add Tomato Paste Lid v2.stl when I get a moment to do it.

Peace out!
Ted.

Also, make sure to check out my blogs, take out a subscription, or a make a donation:
Ted's News Stand: https://www.ohaicorona.com/teds-news-stand/ 
Newsletter signup: https://www.subscribepage.com/tedamailxpress
Paypal Donation: http://paypal.me/teddlesruss 
Ko-Fi page: https://ko-fi.com/ptec3d or https://ko-fi.com/grumpsy