We just finished a new build on our Shapeoko 2 using a 6W 450nm laser Laser Diode from DTR. We were able to reduce the 3D engraving time almost in half compared to using the 2.8W 445nm LD. We are still refining the settings in PicEngrave Pro 5, but here are the results of a 3D engraving we did. It's 7.875" X 5.25" in size with a.125" total depth of cut. We used the J-Tech grbl with S20-S255 laser power commands, a variable feedrate (Feed Rate Change) and streamed the 507,365 lines of gcode with our PicSender program.