Monoprinter Mono2 User manual

Mono2 Grid Calibration
Ver. 1.0
Dec. 8, 2017
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Grid calibration pre-requisites
•Start with larger grid size (ex. 70 microns for mono2)
•Use the Keystone buttons of the projector to make the
horizontal top and bottom lines are in equal length this
setting may be changed by macro lens.
•10x lens: Typical keystone value is -3
•4x or 2x lens: -1
• Projector’s output has heavy UV irradiation, so please use
caution not to see the direct output from the lens
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Focus dial
Zoom dial
Lens shift dial
Mono2 Grid Calibration 1
- Attach +2 macro lens. They are self positioned by
magnets.
- Rotate three dials of a projector (focus, zoom, lens
shift) to its end, if they are off position.
- Download and print calibration grid file
- Sizing option when printing: Actual or 100%
- Cut them into individual pieces
- Make sure the grid width and height is correct

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- Move the z-build arm to 100 mm or higher
- Place an empty resin tank with a film assembled
- Turn on the projector and press MonoWare grid button
- Check the display output is [1]
- Open the shutter
Mono2 Grid Calibration 2
- Place the printed paper on the empty resin tank
- Use the keystone buttons if the upper and lower
horizontal lines are different in their length

- Adjust its position as close as possible to the projected grid
- This demonstration used 70 microns grid paper and 2x
macro lens. The projector position is 178 mm.
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Mono2 Grid Calibration 3
Pixel size
(microns)
Projector
position
(mm)
Keystone
value Macro lens
23 0 -3 +10
46 83 -1 +4
70 178 -1 +2
Default pixel size and projector position settings

- If the top and bottom horizontal lines are different in
length, use the keystone buttons on the projector to
make them equal length
- If there is bent grid, use the barrel correction function
in MonoWare.
- Above setting will usually work, but if you use lower
mag. Lens (+4 or +2), reduce the first parameter from -
0.20 to around -0.10
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Mono2 Grid Calibration 4
Barrel correction settings for xy23 (10x macro lens)

Closing the grid calibration
•Actual pixel size might be different from the one used during the
grid calibration. After the test print, please measure the
reference dimension and recalibrate the pixel size in
MonoWare.
• Projector’s focus dial should be at its end position. If not, the
calibrated grid is not reproducible later.
•Default pixel size is 23, 46, 70 microns. If you need other pixel
size, use the zoom dial of the projector to tune the pixel size.
•You can create your own grid paper. The grid is 16 x 9 or 120
pixels for each grid.
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Q: Printed dimension is not same as design. How can I correct this dimensional error?
A: If the printed dimension is 4.9 mm and the design is 5.0mm, you need to increase the
current pixel size by a factor of 5.0/4.9 on MonoWare. So if the old pixel size was 45
microns, the new pixel size will be 45 x 5.0/4.9 = 45.92 microns.
Q: Grid is not shown on the vat bottom.
A: Check the HDMI cable. Then check the projector source (HDMI1) is properly selected.
Next, check the output display is correctly set on MonoWare. It is usually [1].
Q: The output display is set to [1], but still no projection out of the projector.
A: Sometimes MonoWare is not updated with the projector’s display id properly after
turning on the projector. Click the display output combo box and select [1] again.
Q: Even if I change the pixel size, the printed dimension is not changed.
A: You need to re-slice the model with a new pixel size.
- Keystone value of Optoma HD37 can be adjusted around -1 or -3 for 4X and 10X macro
lenses, respectively. Use this value as a starting point.
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FAQ and troubleshooting

Thank you!
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