Print head crashes at end of print!
Posted: Sat Dec 15, 2018 10:45 am
I just ran a really tall print for my Dremel 3D45 and when I went to check on it in the morning I found the print head had crashed into the print! Hopefully the safeties prevented any machine damage but I never like crashes.
I checked the G code produced by Simplify 3D and found this at the end:
M104 S0 T0 ; cool down extruder
M140 S0 ; cool down heated bed
G1 Z140 F3300 ; send Z axis to bottom of machine <------ !!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!
M107 ; disable cooling fan
G28 X0 Y0 ; home XY axes
M18 ; disable stepper
I added the arrow and exclamation points to show the problem line. For some reason the code generator seems to think 140 mm is the bottom of the machine but it's not! The head was at 167 mm when that line executed so it crashed into the part. My machine configuration lists my Z build volume at 170.0 mm with no offset so why did S3D try to move to 140 mm?
My return window closed last Wednesday so I guess I'm stuck with this software even though I have yet to get a successful build with it. Tweaking the settings is helping but I'm not happy that I have to do so much tweaking just to get a usable print.
The quality issues aside, this particular issue is especially worrying because it crashes the machine. I can edit the g-code before sending but if I forget to do that on a tall print I will get a crash. Not nice.
Anybody have any thoughts on how I can get S3D to go to the proper bottom of the machine?
I checked the G code produced by Simplify 3D and found this at the end:
M104 S0 T0 ; cool down extruder
M140 S0 ; cool down heated bed
G1 Z140 F3300 ; send Z axis to bottom of machine <------ !!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!
M107 ; disable cooling fan
G28 X0 Y0 ; home XY axes
M18 ; disable stepper
I added the arrow and exclamation points to show the problem line. For some reason the code generator seems to think 140 mm is the bottom of the machine but it's not! The head was at 167 mm when that line executed so it crashed into the part. My machine configuration lists my Z build volume at 170.0 mm with no offset so why did S3D try to move to 140 mm?
My return window closed last Wednesday so I guess I'm stuck with this software even though I have yet to get a successful build with it. Tweaking the settings is helping but I'm not happy that I have to do so much tweaking just to get a usable print.
The quality issues aside, this particular issue is especially worrying because it crashes the machine. I can edit the g-code before sending but if I forget to do that on a tall print I will get a crash. Not nice.
Anybody have any thoughts on how I can get S3D to go to the proper bottom of the machine?