# Controller question? **URL:** \ **Category:** Community Laser Talk\ **Created:** [March 31, 2020, 10:52pm UTC](https://forum.lightburnsoftware.com/t/controller-question/14010 "2020-03-31T22:52:28Z")\ **Posts on this page:** 1\ **Showing post:** 4
**Author:** ![Rick](https://forum.lightburnsoftware.com/user_avatar/forum.lightburnsoftware.com/rick/32/69_2.png) [@Rick](https://forum.lightburnsoftware.com/u/Rick)\ **Post date:** [March 31, 2020, 11:32pm UTC](https://forum.lightburnsoftware.com/t/controller-question/14010/4 "2020-03-31T23:32:12Z")
> [@Output Gcode for use on Mach3](https://forum.lightburnsoftware.com/t/output-gcode-for-use-on-mach3/5053/2): > > When I search “Mach3” on the forum, a number of topics already discuss compatibility: > [@Output Gcode for use on Mach3](https://forum.lightburnsoftware.com/t/output-gcode-for-use-on-mach3/5053/3): > > If you’re using Mach3 without an external controller, the spindle PWM doesn’t respond fast enough for laser work. If you’re just doing “on/off” it might be ok. > [@How to use lightburn with mach3 and gecko g540](https://forum.lightburnsoftware.com/t/how-to-use-lightburn-with-mach3-and-gecko-g540/10172/2): > > LightBurn will not drive the machine directly, but you could probably use it to save GCode that you could run on Mach3. I’ve been told that Mach3 is not usable for image engraving because the PWM output for the spindle doesn’t change fast enough, but it might be ok for engraving. If you create a GRBL-M3 profile in LightBurn and use the ‘Save GCode’ button in LightBurn you can probably run that GCode on Mach3. --- _[View the full topic](https://forum.lightburnsoftware.com/t/controller-question/14010)._