Projectors List

SimpleRapid · 2017-01-28 07:42:01

Hello,

Can anyone give me a list of the best projectors that can be used to make a DLP printer with nanodlp ?

THANKS!

robertk925 · 2017-02-17 17:36:00

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).

archy587 · 2017-02-18 04:50:00

robertk925 wrote:

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)

robertk925 · 2017-02-18 05:49:18

Yes, of course. I used pixel size here (microns) as shorthand for projected size/projector resolution.

archy587 · 2017-02-18 23:05:51

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

robertk925 · 2017-02-20 23:11:49

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.

webies · 2018-11-12 07:40:32

Viewsonic is good for such requirements. Of course, you have to go with 1080p screen resolution if the projector has 1080p, it should work.

harryjosh · 2019-05-18 20:32:22

Some of the existing kit-based DLP printers may be a good place to start, for example here's Optoma projector https://www.outdoormoviehq.com/optoma-uhz65-review/ have the 0.66-inch DLP chip with the Optima DuraCore laser, making this one of the tops of the line projectors in this company offers. One thing to bear in mind is if you just buy a projector you might need to modify it to use it for 3D printing.

elliot · 2019-07-18 20:14:17

Anyone have a link to get 4k to run on a raspi3? I've been following on the ras pi forum but still get 1080 max . This is the addition to config file I found, but I can't get it to work. Is frame rate too high?

# For more options and information see
# http://rpf.io/configtxt
# Some settings may impact device functionality. See link above for details

# uncomment if you get no picture on HDMI for a default "safe" mode
#hdmi_safe=1

# uncomment this if your display has a black border of unused pixels visible
# and your display can output without overscan
#disable_overscan=1

# uncomment the following to adjust overscan. Use positive numbers if console
# goes off screen, and negative if there is too much border
#overscan_left=16
#overscan_right=16
#overscan_top=16
#overscan_bottom=16

# uncomment to force a console size. By default it will be display's size minus
# overscan.
#framebuffer_width=1280
#framebuffer_height=720

# uncomment if hdmi display is not detected and composite is being output
#hdmi_force_hotplug=1

# uncomment to force a specific HDMI mode (this will force VGA)
#hdmi_group=1
#hdmi_mode=1

# uncomment to force a HDMI mode rather than DVI. This can make audio work in
# DMT (computer monitor) modes
#hdmi_drive=2

# uncomment to increase signal to HDMI, if you have interference, blanking, or
# no display
#config_hdmi_boost=4

# uncomment for composite PAL
#sdtv_mode=2

#uncomment to overclock the arm. 700 MHz is the default.
#arm_freq=800

# Uncomment some or all of these to enable the optional hardware interfaces
#dtparam=i2c_arm=on
#dtparam=i2s=on
#dtparam=spi=on

# Uncomment this to enable the lirc-rpi module
#dtoverlay=lirc-rpi

# Additional overlays and parameters are documented /boot/overlays/README

# Enable audio (loads snd_bcm2835)
dtparam=audio=on
disable_camera_led=1
hdmi_pixel_encoding=2
start_x=1
gpu_mem=128
disable_overscan= 1

hdmi_ignore_edid=0xa5000080
hdmi_group=2
hdmi_mode=87
hdmi_cvt 3840 2160 24

config_hdmi_boost=7

framebuffer_width=3840
framebuffer_height=2160
max_framebuffer_width=3840
max_framebuffer_height=2160
hdmi_pixel_freq_limit=400000000

elliot · 2019-07-18 20:17:18