I didn't ask. I simply asked if the firmware would support such a command and they replied "yes". I should mention that I am brand new to the S3D product and have no idea how I would specify the command other than selecting a specific option on the dashboard. What I'd like to see is the option presented the same way the start/stop option is displayed.
Greg Herker at 3PI Tech tells me that his engineering folks are contacting Simplify directly. I'm hoping this can be done quickly because I really need this function.
According to the RepRap G-code reference wiki (https://reprap.org/wiki/G-code), M600 is supported by Marlin (the flavor of G-code Snapmaker uses). It's defined as a filament change pause, but I suppose you could use it for any purpose.
The OP asked about a Dremel printer, and I don't believe that uses the same command as the Snapmaker.
I believe the Dremel machine uses G5 to initiate a pause. So if you want to pause at layer 75, just add the following to Edit Process Settings > Scripts tab > Pre Layer Change Script: