Don’t look at them when you laser them.
(And I don’t want to be a party pooper, but the eggs shown in the Pinterest link are drilled, not lasered. It’s darn hard to get a cut through on an eggshell with a laser, without charring the other side of the egg.)
If I were going to do it again, I’d mark the eggs with the laser and use a dremel on them.
and… a dremel isnt even really fast enough… i use a dental drill that gets to 400,000rpm
i so DESPERATELY wanted the laser to cut eggs… lol.
Here’s a thought I just had: what if we fill the blown egg with gelatin and let it cure good and stiff, before lasering the egg? The gelatin might protect the backside (or it might burn and smell really awful), and it could be dissolved out afterwards by soaking in water. If you try it, approach cautiously and be prepared to terminate the run!