I actually recently saw someone selling ceramic hides that looked exactly like upside down bowls, just with a cut out for the opening. I didn’t see a name for their business though. I think the idea you have of making one would work great though so you could make the exact size you need.

I did end up ordering two more hides for Red Bean so we’ll see how that goes. I can add some scent from his aspen to them if he’s freaked out by the new smell. I think his current hides are just way too big so even stuffing with aspen/paper towel doesn’t really work. I didn’t realize how big they were until he started having this issue, my other king snake has the same hides but I guess he’s much bigger than Red Bean since he seems to fill up the hide just fine.