I bought a probe for my CNC Shark, but after using it once just to try it out I've never bothered using it since. I haven't found any reason for using it since then.
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That sounds like a pretty cool library. A makerspace complete with equipment like a 3D scanner is amazing.Probes are fairly simple devices and I have seen some DIY plans. I have not yet had anything I was interested in probing to capture, so I have never bought or tried to make one.
A local library (unfortunately not the one 1/4 mile from my house) has a makerspace, among their equipment is a 3D scanner. I figure if I ever need to reproduce some 3D object , I will just go there and scan it for free. 3D scanners are even more expensive than probes.
You may wish to check around if there are such services near you. There are a lot of maker spaces around most big cities, and quite a few libraries seem to be getting into the act. Some STEM schools and many colleges probably have scanners as well.
Either probing or 3D scanning may be suitable for capturing an existing mold, but if the mold was originally routed, it would likely be faster to start with the original CAD file and make changes there.What about using it for existing molds where it could be scanned
and then afterwards changes could be made, then recasted?
Does it sound "probable"
Also, if placed on the table, would it tell where it is X,Y ?