Awesome!

Lots of wonderful, wonderful details in that latest update. Very nice that they had a solution to the problem (eliminating the ringing so it can easily point away from the build area), and then went and solved it another way too (able to turn off the laser). It gives me confidence that this is going to be a printer "done right", not just "done until it works".

I am a little bit concerned about the need for an additional amplifier board. I'm sure that it'll work fine, but I'm generally reluctant to use any fixed-function circuit when for much the same price (these days) you can just drop a microcontroller on there and do all sorts of cool things (reading from SD, talking to devices that don't have audio input/output, auto-calibration without a PC, etc).