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Hello,
Can anyone give me a list of the best projectors that can be used to make a DLP printer with nanodlp ?
THANKS!
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As far as I know there is no single list. What you are looking for is a projector that projects the correct bandwidth of light to cure the resin (which most DLP printers seem to do to various degrees), and has a very short close focusing distance. Some of the printers I know that work are:
Acer 6510BD
Acer P1500
Viewsonic PJD7820HD
Viewsonic PJD7822HDL
Viewsonic PJD7828HDL
If you look on http://www.projectorcentral.com you will see that they all have the same throw ratio of 1.15-1.50 and zoom ratio of 1.3. This allows them to create a focusable image that is small enough to have a build area ranging from around 50-100 microns. Let's compare this to a different projector, one that I mistakenly bought based upon some information I read on muve3D's website.
The Viewsonic PJD7720HD has a throw ratio of 1.49-1.64 and a zoom ratio of 1.1. This does not allow it to create a small enough focusable image. I would estimate that the smallest build area was around 150 microns. So, I had to modify the project by adding spacers behind the front lens so that I could focus it down to 50-100 microns.
The issue is that many of these projectors are not made anymore. It seems like the Viewsonic PJD7828HDL is the only one readily available (on Amazon for example).
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build area ranging from around 50-100 microns
do you mean individual pixel size of 50-100 microns??? If not I am completely confused...
Last edited by archy587 (2017-02-18 04:50:16)
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Yes, of course. I used pixel size here (microns) as shorthand for projected size/projector resolution.
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I see, well is there a limit to how large of pixel size you can use?
With the projector you bought, if you wanted to print at 150 micron XY resolution, would it still work? I understand there would be a trade off on the fine detail you could achieve on the finished part, but if you wanted to print larger, less detailed parts, would you be able to? Would you have to increase cure time with pixel size? or would it no longer cure properly as the pixels get too large?
thanks
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No, you can use as large a pixel size as you want, although the cure time will change. However, you need to scale up your vat to accommodate a larger pixel size (and hence a larger projected size), so there is a practical limit to how large a pixel size you would want to use.
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