After a bit of practice, sanding yields very good results!
They sell a mold on AliExpress https://www.aliexpress.com/item/1005004427632078.html
I am also experimenting with a version having two different halves to simplify stone removal after molding. First results seems promising, again the excess clay should be easily sanded off.
Do you not use saran wrap for easier removal? You should try if it works with your mold
Yes I can try. I am trying to optimize timing so i have to consider the time to put wrap paper.
Also it might not work well with the protruding edge (it might get stuck).
But yes, it is something to try
Ok non-stick film works great! Thanks.
I updated the designs on Thingiverse.
Now I’ll be off for a while, making some stones
I’ve made your design, works great:
For sanding, I made another tool from another piece of a ping pong ball that I glued sandpaper to and attaches to a drill:
If I use it for a bit more, the stones get polished so smooth that I can see my reflection on them.
Also, here’s another design for a stone making tool, by gluing the molds to some pliers:
Now, regarding painting. I am using brush and paint, but I think I might switch to spray painting as it is faster and more uniform. Any advice? Also in terms of texture, are real stone slippery, or more satinated?