Bulging effect on top down DlP printer.(solved)

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kakapoopie
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Re: Bulging effect on top down DlP printer.

Postby kakapoopie » Tue Nov 18, 2014 2:58 pm

Thanks Pomeroy

GUYS! Last night I did a test print with super long settle times (30s) between layers. This helped tremendously...virtually no bulging. Also increased Z height from 30um to 50um which helped the resin settle between layers. I'm thinking about getting some Spot A to test next to try to get these settle times lower. So excited about this :)
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PomeroyB
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Re: Bulging effect on top down DlP printer.

Postby PomeroyB » Wed Nov 19, 2014 12:35 am

How fast is your build time with a 30 second dwell?
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kakapoopie
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Re: Bulging effect on top down DlP printer.

Postby kakapoopie » Wed Nov 19, 2014 3:53 am

About 8 hours for 45mm height
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PomeroyB
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Re: Bulging effect on top down DlP printer.

Postby PomeroyB » Wed Nov 19, 2014 4:06 am

Not terrible... Especially since you're building a 50 microns!

I wonder where you begin to get diminishing returns... Is 15 seconds enough? 10? But how do you measure bulging? Just by looks? or is there some quantitative method?

I might have to do some testing on this... not too keen on the wiper solution.
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kakapoopie
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Re: Bulging effect on top down DlP printer.

Postby kakapoopie » Wed Nov 19, 2014 2:22 pm

Just by eye..mainly things that are straight in the model are now straight (which were bulging before)

Since I'm doing prints overnight, I just set maximum dwell that could fit in 8 hours. I tried 15 s actually and was still getting some bulge, but not as much. It all depends on how viscous your resin is, how thick your Z resolution is and how wide your part is.

I will definitely be trying Spot A LV next since FTD seems pretty thick. Does anyone know of any other good low viscosity resins?
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firecardenal
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Re: Bulging effect on top down DlP printer.(solved)

Postby firecardenal » Tue Jul 07, 2015 5:01 pm

Solved

viewtopic.php?f=20&t=3266#p10842
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