Glad to hear you are back on your feet.
Just to make sure you have this information, here are our recommendations for alignment, from K40 initial setup and regular maintenance: Alignment
The path that the laser takes along three mirrors and the lens needs to be precisely aligned. Here are three resources that may help you understand how to do this.
If you prefer video instruction:
Ep6: Laser Beam Alignment. The DIY CO2 Laser Cutter / Engraver Build Series
If you prefer written instruction, here are two guides:
- The “Tim the Floating Wombat” guide: K40-Alignment-Instructions.pdf
- The “smokeandmirrors” guide: laseralignment.pdf
Note that if the third mirror does not align the beam with the middle of the lens, the beam will not be focused correctly and will not be aligned with the hole in the nozzle. You may wish to use a device that helps you align using a red visible laser. One kind uses a “beam combiner” that slightly reduces beam power, and the other is a tool used only while performing alignment .
That link at the end is for a visible laser alignment tool that you might be interested in.