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Build Your Own SLA/SLS • Noob Question About Curing & DLPs
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Noob Question About Curing & DLPs

Posted: Mon Aug 08, 2016 8:04 am
by drewbacca
I am coming from FDM printing so bear with me when I say that I am a noob. Anyways I was reading up on DLP printing and I am fascinated with the technology and how it works. I just can't wrap my head around the curing process.

I get its a photo-sensitive resin that cures at ~350-450nm wavelengths, and that arc projectors can output those UV numbers. My question is, if the process is halfway through printing a hollow sphere, for example, how does the projector focus and cure only the object needed and none of the liquid resin between the projected image and WIP sphere.

explaining.png


Thank you :)

Re: Noob Question About Curing & DLPs

Posted: Tue Aug 09, 2016 10:20 pm
by Bogus
DLP is layer based and the layer being cured is at either the very top or bottom of the vat, whichever is closest to the incoming light. The part is attached to a platform that moves along the Z axis, so after a layer is cured the part moves up (or down) so there's a fresh film of liquid resin ready for the next layer.

Re: Noob Question About Curing & DLPs

Posted: Wed Aug 10, 2016 7:59 am
by drewbacca
Ah it makes sense to me now, I never understood why they move up and down in the Z.

Thank you