Do you have to pedal the entire time to keep the laser up and running?
Not normally, but Alton took the day off.
.. that slacker.. :tongue:
I was hoping to try it in anodized aluminum, but my anodizing skills are ..
... um .. sub par. So I was hoping that with a highly polished aluminum
blank and a ceramic marking spray I'd get the high contrast I wanted.
This is the closest I got, after sanding off the marker several times. (you
can see that the bottom is over-sanded by now)
I might try it one more time, oversanding again and then casting in clear.
That way I could build up a clear coating to protect the ceramic marker.
Might need to try a different marking spray, too .. but they get almost
$100 for one of those 12 ounce spray cans!

(with shipping)
I was hoping to make these available, but for that 2 hours the laser can't
be unattended, and I can't use any other equipment because of the
power fluctuations. Watching the laser beam with your remaining eye is
only interesting for the first few minutes. So they're not commercially
viable.
Thanks for the comments, guys!