If you have any problems with image quality on your fiber using the rotary, try changing the steps per revolution. They come from the factory set to 6,400 and for most purposes that would be fine. I'm working on some large diameter pieces and have been seeing a lot of issues with what I'll call bouncing - the rotary turns to mark the next segment and instead of completely stopping, it bounces back and forth a bit. This is causing the edges of the engraving to look like they do when you have backlash issues. So, after lots of experimentation with every setting I could find, even swapping out steppers, I decided to change the steps per revolution. I started with 12,800 and it was much better, then changed to 25,600 and it was virtually perfect! It doesn't change the lasering time by much but it is very noticeable when it's turning a long distance. However, it is smooth as you can possibly imagine, especially compared to when it was set to 6,400. This involves changing the jumper on the driver as well as a software change, total to do both is less than 1 minute. If I ever need to do small diameter parts I'll probably change it back, or lower at least, but for now I'll leave it as is.