This issue has come up again and applies to the Prusa MK2. S3D is leaving the fan start code out of the gcode for a part. I printed Part A yesterday and the part fan came on at the second layer as expected . I then printed another model, Part B and the fan did not come on.
I checked the gcode and the M106 code is there for part A but not for part B. I had not closed or changed any settings in S3D. Just a different part.
I reloaded Part A into S3D and generated the gcode and now the M106 is not there. Same part, settings etc. just 24 hours later it is not adding the fan start.
This is not an issue for other printers. It is only affecting the MK2.
The only fix I have found is to reset S3D and redo all of my profiles.
This is a reoccurring issue and others are seeing the same thing.
Thanks for any thoughts.