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The laser is still there, we could use the peachy laser... But you are right, the sensor elektronics have to be added.

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/ (semitransparent mirror) - - - - (laser)
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Why not use the laser and a floating mirror on the resin. Messure the time, the laserlight needs to a sensor.

Only to clearify this, you can't do it with the default dripper system. If you change the dripper into a controlled system, like a pump or something, than the peachy should be able to print a perfect...