I run Marlin 2.0.5 (custom build) on an SKR 1.4 board.
I have similar issues as per Jobs stop after a short time (20sec - 1 min)
I recompiled and flashed new firmware with the suggested
-//#define RX_BUFFER_SIZE 1024 +#define RX_BUFFER_SIZE 128
The job stops early when run from lightburn, and even leaves the laser still on (!) It stops after 2-4 seconds (so just 4-10 gcode instructions), but not in the same place.
Saving the gcode and running from pronterface or octoprint works fine, the full laser cut is made.
On Linux I’m using lightburn 0.9.16, on Ubuntu.
- Linux Ubuntu lightburn
- Windows 10 lightburn
- Without any USB extension cable - just short ‘blue’ cable the SKR 1.4 board came with
The Console shows
Starting stream Layer C00 echo:Unknown command: "M9" M106 P0 S0 M106 P0 S255 M106 P0 S0 M106 P0 S255 M106 P0 S0 M106 P0 S255 M106 P0 S0 M106 P0 S255 M106 P0 S0 M106 P0 S255 Stream completed in 0:00
But there are more instructions that that, it appears to just stop sending them. Note it ends on an S255 (laser on).
It seems also the gocde contains M8/M9 instructions even if I have ‘air assist’ disabled for that device; but it appears harmless.