5D subtractive machining can do some amazing shit too but using it for printing is way cheaper because you don't have anywhere near the forces involved that machining takes. All the modern printer controllers are pretty sweet and many low cost ones have large numbers of axes they can control that are perfect for a 5d setup. I expect to see more neat stuff like that in the future. It's really nice to see resin printing go mainstream and resins come way down in price.
Not done anything with resin printing. But have noticed some novel resins come out. Ceramic and high temp stuff is pretty interesting. Maybe used for.. what's it called? Reversed wax molds. That's not right but you can probably infer.
I'm honestly surprised more hasn't been done with non-planar printing, especially at the hobbyists level. Maybe additional axis will move this forward?
PLA is used for lost plastic casting and you can get PLA resin. I haven't seen it done with resin printing but I haven't looked for it either. Non-planar printing isn't always the best way to make an object but it has been done with software. Let's see what he future holds because basic 3d printing at the hobbyist level does a good job with the basics right now. Multi material printing has a few methods developed but apparently none are all that good...
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