I made a ring myself cause I lost my wedding ring. When making the boric acid paste I added water, after some research turns out alcohol is better than water. So I suggest to do as I suggest not as I did. Ring size mandrel link : https://www.thingiverse.com/thing:3397531 Facebook Page: www.facebook.com/profile.php?id=100091598535724 Instagram: www.instagram.com/d1l3tt4nt/