Specifically, anyone got settings for cutting the blue foam camping pad from Walmart? There’s an instructable that mentions it’s a safe type of foam to cut with laser and it’s cheap ($8 for a 2’x6’ piece), but the instructable writer wasn’t using a Glowforge.
I’ve played with it a bunch and while I’ve found settings that seem reasonable for cutting out a small square (2x3" or so), what doesn’t work is cutting smaller holes in it, especially if they’re close to one another. It’s definitely that there’s just too much heat in a small area and it melts the foam, particularly the middle of the hole. That’s not horrible except it always melts back to the first side it cut and thus is hard to remove. It also “wallows” out the hole on the bottom badly…that is to say the top looks dimensionally correct, but the bottom of the hole is often much larger than the top. I kind of need a uniform hole.
I’m almost thinking I need to separate my drawing into several sets of lines…the holes are rectangular, so I could probably make the top of all rectangles one cut, then the bottom, then the right side, then the left side, so that the heat isn’t all in that one spot for as long at one time.
Any other suggestions? The baseline that seems to cut fine for longer cuts is a speed of 200 and a power of about 85-90. But I’ve tried higher speeds, lower speeds, lower power with two passes, etc. Nothing seems to help much but I can definitely melt it a lot worse!