Laser cutter calibration assistant

by i-make-robots, published

Laser cutter calibration assistant by i-make-robots Jun 11, 2013
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I bought a laser cutter. The worst part of calibration seems to be aligning the mirrors. The laser beam is invisible and very dangerous, so the recommended way takes days and goes like this:

  • put new paper/tap on the 3 mirrors
  • fire invisible CO2 beam
  • look at holes in paper/tape
  • adjust mirrors
  • remove old paper/tape
  • repeat
    including a lot of opening and closing machine in the middle. If you had a mostly harmless visible beam that matched the C02 beam then you could adjust the mirrors in minutes. ...and that's why I made this.


  • Get a $10 cat annoying laser
  • Print two copies of this part. It is printed on it's side to prevent delamination problems.
  • Bolt them together with 25mm M3s so that they clamp onto the cat laser. The middle finger on the holder should push the button on the cat laser. The holder has long fingers so that the laser can be tilted, if necessary.
  • Rest it on a flat surface. You can also use the bottom hole to mount it on an M3 rod (which would need a base of some kind).
  • Put the tape on the mirrors.
  • Fire the C02 once.
  • Move the cat laser stand so that the red dot goes through all the tape holes. Both lasers now match. Do not move cat laser again.
  • Remove tape.
  • Align mirrors.
  • Turn off and remove cat laser.
  • Go mess with your pets.
    This has not yet been tested so I would appreciate your feedback.

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How do you set a mirror in between the laser tube and the 1st machine´s mirror? I have a gap of only 3cm. Thanks!!

that's not enough of a gap for you? put a right angle mirror in the gap so you don't have to fit the whole cat laser in the gap.

I'm a bit confused as you where you sit this laser, do you put it in front of the output end of the CO2 laser?


The first time I saw this being done space was tight between the tube and the first mirror.
They used a prism or mirror to place it at a right angle. to the original tube.

Thanks, that makes sense. There is only 10mm between our laser and the edge of the first mirror holder.

I have recently tested this device. Worked great! What used to be burny, sooty cuts are now smooth and mostly smell-free.