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.
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The author hasn't provided the model origin yet.