[bobsmooth]

The layer lines will show up in the silicone.

[cassianoleal]

That’s called ribbing and it’s a feature.

[a_bored_husky]

Beeswax

https://www.billieruben.info/post/3d-printing-sex-toys-a-qui...

https://news.ycombinator.com/item?id=28819927

[peterpost2]

You could lightly sand it before using it as mold, would lessen that issue.

[lrvick]

Or a little bit of alcohol vapor smoothing if you print the mold with ASA