I was setting up to create some coasters. I know that alignment is better if you place material in the center of the crumbtray, so I was marking inches on the cardboard I was using to cut a jig first. (File has 4-6 different PNG images to etch on 4-6 coasters, and also SVG squares around those images to cut so that placement will be exact.)
It occurred to me that I could use a paint pen and actually mark the crumbtray itself. Has anyone tried this? Is there some hazard in doing so that I haven’t thought of?