Cube Tomato Mold v.2 is a remix of the original author's "Square Tomato Mould" linked below. It has tighter tolerances, even more so than my previous upload.
Check out the link below to check some facts about your tomato. The way I measured my tomato volume was using water displacement and then making a box with those volumes.
Resize your model as you see fit. I recommend printing in PETG but I have also found success in printing in PLA but don't be surprised it if it doesn't handle the outdoors well.
The author remixed this model.