OMTech Maker AF2028 90W

The lack of a mechanical focus.

Developing all the setting for the different materials and the lack of autofocus or floating z axis ( Curved Surfaces )

Everything. The engraving was awful. And then my laser power supply went out after 20 mins of using it. Took 2 weeks to get a new one and was a major pain to replace on a brand new machine. Still didn’t work right and ended up returning it. I’ve had 3 omtech products now and NONE of them have worked.