To get the type of resolutions you will need for a dental crown you will need a Stereolithograpy 3d printer. They basically use light to cure resin. The B2 uses a projector, the Form 1, a laser. I ran across a new printer from dwslab.com. You might want to check that out too. I have also seen specific resins that will burn out cleanly. A lot of jewelers are designing jewelry in a CAD program like Rhino, then printing out a pattern and investing it just like the traditional lost wax process. That being said, I am not sure if any of those printers have the resolution you will require to have an accurately fitting crown.
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gr5 2,295
.02mm is the resolution in Z but the nozzle has a hole in it on the UM Original and UM2 that is .4mm in diameter. Or .2mm in radius. That means in XY you can't print anything smaller than about .4mm. Also it means you can't have sharp corners any sharper than a radius of .2mm in XY plane. However you *can* print objects "sideways" so that you get the best resolution in a particular dimension.
If I print a knife flat on the glass bed I can make it amazingly sharp - sharp enough to cut my finger. But if I print it vertical it will be quite dull (.2mm radius).
I recommend you look into the b9creator (google it). This can print equal resolution in X, Y, and Z. Not just Z. Or look at the more expensive form1. I believe you can use the prints from these printers as investment casts.
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