E9 - Leveling and Focal length of Lasers with Galvo Head 

If you have recently got a laser with Galvo head ...
If you do not get uniform engravings or marks all around the working area of the lens ...
If you are in doubt that the focal length of the laser is right or not ...
... this tutorial could be interesting for you to make the lens level to the bed and double-check the focal length.
Step 1: Introduction
Step 2: Galvo Head / Lens Levelling
Step 2.1: Lens Levelling an IR laser with Galvo
Step 2.2: Lens Levelling a Fiber laser
Step 3: Laser Focal Length
In this video, you learn how to level the lens of a galvo head to the bed and also how to find the optimal focal length of the laser.
Keywords: Galvo, Galvo mirror, Galvo head, lens, focal length, level, fiber laser, galvo laser, Atomstack M4