adafruit wrote:either your device has it or it doesnt. epilogs do, cheaper lasers tend to leave it out
Thanks, I'll ask the manufacturer if the machine has this feature.
A self-centering vise
would help with centering in one direction, and the second direction might not be as critical in your application. But if you're primarily working with a limited number of shapes, then making pockets or cutouts in a piece of acrylic fixed to the table should be the most reliable. And you might not necessarily have to center everything. You could make an iPhone pocket toward one corner of your acrylic piece and know that any time you'll be engraving an iPhone, that the phone center will be at a known X and Y position on the table. Then you can position pockets for other items elsewhere on the same acrylic piece.
Using something to hold the device I'm engraving is a great idea. So if I want to engrave a 13" MacBook Pro, I would just cut out a shape with the laptop's dimensions in the acrylic?
How do I tell the machine where the starting point is (for example, top left corner)?