DropLit v2: Max in-plane and Z resolution?

Vat designs and coatings etc..., Electronics and mods, Z stages and mechanisms to release the prints from Vats etc...
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626Pilot
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DropLit v2: Max in-plane and Z resolution?

Postby 626Pilot » Thu Dec 01, 2016 4:31 am

I was wondering what in-plane and Z resolution are, assuming that you get a 1920x1080 projector.

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lightninjay
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Re: DropLit v2: Max in-plane and Z resolution?

Postby lightninjay » Thu Dec 01, 2016 8:41 am

As far as the Z resolution goes, according to the build guide, an M10 x 2 x 200mm Trapezoidal Lead Screw is used to drive the Z-axis. Your Z resolution will be based on this screw amd your motors ability to microstep low enough to achieve micro turns of the Z-screw.

In the likely event you were already aware of this, I apologize for not having more specific answers.
If at first you don't succeed, you're doing something wrong. Try again, and if it fails again, try once more. Through trial and error, one can be the first to accomplish something great.

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626Pilot
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Re: DropLit v2: Max in-plane and Z resolution?

Postby 626Pilot » Fri Dec 02, 2016 5:55 pm

Did a little math, based on the projector resolution and the published resin tank size. This assumes that the projector is focused to perfection: it exactly fills at least one dimension of the resin vat, with no blur at all. We can't have both dimensions fully covered because the aspect ratio of a 1920x1080 projector is slightly different from that of the tank.

Dimensions (mm, px)
-------------------------------------
115 <-> 1920
70 <-> 1080

Aspect Ratios
-------------------------------------
1920/1080 = 1.7777
115/70 = 1.6429

Pixel Sizes
(assuming full vat coverage)
-------------------------------------
115/1920 = 0.0599
70/1080 = 0.0648

The aspect ratio of the resin tank doesn't exactly match that of the projector, so I guess you'd get full Y (1080 pixels across 70mm) and most of X (1920 pixels across slightly less than 115mm). Based on this, I suppose that we could expect a resolution (projected pixel size) of about 65 microns in the XY plane. With a normal FDM printer, we'd have a minimum feature size between 250 and 500 microns (usually either 400 or 500), depending on the nozzle.

How does that look?


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