nanoDLP

Nanodlp has now implemented an even better mask generation algorithm similar to that on buildyourownsla.com, but better in that you don't need Rhino or magic numbers or formulas to determine the mask, and any UV sensor in the cure range of the resin can be used without calibration due to the set point methodology.

http://www.nanodlp.com/forum/viewtopic.php?id=142

Ahhh! Nice find! That's a feature I didn't know about. Changing color to white on the profile fixes the issue.
Looks like black is the default when I add a new profile. I didn't realize I had to change it to white.

Removed mask
installed build 1222
rebooted rpi
created plate with ring3_plate.svg
nanodlp slices
still get error: Skipping public/plates/10/info.json file. stat public/plates/10/info.json: no such file or directory
result is black preview images

I don't have anything else to try, so hopefully you have a suggestion for how to get this up and running again?

I used my PGM file and resized and converted to JPG (instead of PNG). I uploaded mask and checked it was there (looks great). I restarted rpi and loaded the SVG onto the plate. It slices. But, all the preview images are completely black.

I unplugged and re-plugged in raspberry pi and then it started slicing, but all slices are completely black. This is really weird. The home page gets this error: Skipping public/plates/5/info.json file. stat public/plates/5/info.json: no such file or directory

I'm completely stumped. I can't print at all until this is figured out. Or, is there a way to step back to prior build?

Sent

Removed the mask, deleted plate, and re-uploaded SVG onto new plate. Still says "Plate #1 is being processed...". Preview Layers button shows no layer images.

Depending on the size you need to print, you could have different masks that optimize the speed of printing. For example, you could have a mask that dims very little for a 3" diameter even intensity, one that dims for a 4" diameter, one for the whole projection area. The first mask would print very fast for small items, the second would print slower but would work for medium items, the third would print very large but take the longest. While you can do still do this, the setup time is longer due to re-uploading for each mask. Note: I haven't tried the internal slicer.

I would suggest the following for the help:

You need UV sensor or equivalent to use this feature.
How it works

    Empty the vat of resin and clean the vat bottom surfaces inside and out
    Specify number of measurement points in both x and y axis, and the size of measurement squares
    Tabular cells are displayed on the user interface. You can change the cell values from 0=black to 255=white.
    When measuring, hold the UV sensor in the middle of the measurement square projected on the inside the vat
    Use the UV sensor to determine a set point value which is usually the lowest value of all the measurement squares (probably the corner values)
    Decrease the cell value for each measurement square until the UV sensor reads the set point value (do not press enter unless you want to display the mask)
    Press preview and double check the surface area to see if UV intensity is the same across the entire vat bottom.
    Save mask (It takes up to a minute to generate a complete mask).
    Goto Setup..Projector Mask to see the saved mask on the user interface (press refresh if necessary)

Elliot,
Re: bandpass - Looking at the curve for the sensor, the 405nm output will be about 20% of the output for 390nm, but there should still be an output. At least that is my hope.
Re: stl - Super! Thanks!
Re: brightness - I personally haven't played with brightness. I can conceptualize the bleedover situation you describe. I'm not quite sure how this maps to even UV intensity across the entire vat bottom? I think bleedover might be very local (millimeters) and lamp intensity is across the entire vat bottom (multiple cm)? The greyscale is being done by projecting the mask verses just a blank white rectangle. Any time a slice is projected it does a boolean AND of each pixel on the mask with each pixel on the slice. The mask is created by the method described in prior posts. I'm no expert at this stuff, so hopefully this is making sense...

Regards,
Larry

Here is the mask I generated with Nanodlp:

So I decided to see what this would look like with the resize algorithm... I followed this process...

Create a PGM file by inserting the values you entered into Nanodlp (make sure to have .PGM as the file extension)
test27.pgm.txt

Convert the PGM to PNG (select color=gray):
Use this URL: http://image.online-convert.com/convert-to-png
The image is very tiny right below this text

Resize to 1920x1080 (select png file from above, section 4 uncheck "keep aspect ratio" & enter 1920 & 1080, section 6 select PNG, section 7 select Lossless Compression, click [resize image] then [download image])
Use this URL: http://resizeimage.net/

I use this sensor I got off of eBay: ML8511 UVB UV Rays Sensor Breakout Test Module

Shahin, looks like for build 1218 the blocky mask is being stored when [save mask] is pressed and then displayed on Setup..Projector Mask

(On this test, I put value 200 in center cell and 220 on each side)