This one is going over in the Land of Sorcery so I can be a bit more specific. If you have not yet, take a look at the posts for “Samurai Sunrise” and “More Experiments With Canvas” to see what I am babbling about.
The basics are this: I start with a basic 8 by 10 canvas and go to town on it with some spray paint of various colors. If I want the finished image to have brighter colors, I throw two coats of clear over that when it’s dry, and let that sit overnight. If you want a more pastel color set, skip the clear coat.
Top this all off with a solid coat of paint (I used black for the most part) and let that dry completely.
Now comes the fun part (pew pew pew). The goal is engrave an image such that it removes the black in all the dark spots, but does not remove the colors underneath. What I have found so far seems to be go fast and use as much power as you can get away with before it starts removing the colors.
After some testing, I am using Speed 1400 / Power 40 and 225 LPI for most things (I am on a Basic). However there is some variation based on the paint type and the coat thickness (try to be as even as possible with your top coat).
I also discovered that Killz is pretty much laser proof. I can get through it at full power 1400, but just barely. Good to know this for when Alexa becomes sentient and takes control of the Glowforge… For the next canvas project I ordered some white acrylic spray paint to try instead.
You also want to invert any images you use otherwise you end up with a negative. This can also mess with your head a little since selecting an image in the glowforge UI inverts it to show it is selected.
More experiments to follow…
After some additional experiments, I think upping the power is probably a good idea. I have moved to the 55-80 range in power. Light grey is still a bit problematic, but I have gotten around this in places by cutting the files up and isolating the dark blacks from the grays and giving the grays more power.
A screenshot from No Man’s Sky
Some fractal clouds
A fractal mandala.
A combination image with a fractal and a concept image of a dyson sphere. This one is kind of cool because it’s the first one I have done with a white overlay instead of a black. I probably should have stepped the power up on this, but overall it’s still pretty cool.