Rookie007 in the post "Are the marks on the ellipse template the only possible minor axis? Explain question in the comments"
2021-12-06 15:03
The paper folding technique is your friend if you are unsure cut out the shape and try to fold it in half no overhang
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Rookie007 in the post "I cut up a paper towel tube to make a model for drawing cylinders. It's not perfect, but it's been very helpful"
2022-05-24 12:33
Alternatively a clear glass with no taiper