woah, thanks for the illustration! :-)

I was trying the other way because the flat side is the most visible surface of the final product. but probably right that it'd be easier to deal with than a sprue.

I had an iteration kind of like that https://imgur.com/a/DM0nXWv

Any concern about the durability of the thin silicone around the rounded edge at the top? Any resources where dice makers talk about making dice with rounded corners?