Little guide how to rescue a thermal runaway print: If it is still stuck to the bed So your print stopped because of ... the fan argh!!11!!1. OK Steps: - Find your stating point E.g. go to Octoprint > Terminal tab or S3D terminal output or, or, or, or else you could try a caliper... good luck Right before the "thermal runaway System Halt" line you find the last position it tried to print like this one: Code: Send: N71694 G1 X199.057 Y155.076 E49.77390*91 The important part is G1 X199.057 Y155.076, the end / start point - Open the g-code file in a text editor I use notepad++, it has line numbering and bookmarks (line marking)- Search for this point you should only find one instance... if you find more... it's harder to find the correct layer... caliper ?!?- Bookmark the line or note the line number. - Search back/upwards for "G1 Z" this is the start of the current layer, bookmark it too.- have a look on the lines around the layer change Spoiler: finding start point g-code and stuff ; end of last layer G1 X38.333 Y154.092 E98.72381 G1 E97.52381 F4200.00000 ; retract G92 E0 ; reset extrusion distance ; Our Layer change ; Note the Z height we need to know it so we do not crash into the print on restart G1 Z2.750 F7200.000 ; BOOKMARK2, G1 X78.260 Y150.640 F7200.000 ; move to first perimeter point G1 E1.20000 F4200.00000 ; unretract ; F1200 is important here, this is the print speed we need that. G1 X78.260 Y47.160 E5.83846 F1200.000 ; perimeter... Lot's of lines in between... G1 X199.057 Y155.076 E... ; BOOKMARK1 - Change it like this G1 Z2.750 F7200.000 ; BOOKMARK2... delete all line between the bookmarks and replace E.... with the F1200.000 G1 X199.057 Y155.076 F1200.000 ; BOOKMARK1 - Go all the way up to the top, you should find a lot of comments (lines starting with ";") and your start g-code like this: Spoiler: M107 ;BigBox Printer Start Script Begin... bla blup M107 ;BigBox Printer Start Script Begin ;relies on M83 (use relative extrusion distances) M117 Preparing M140 S70 ;set bed temperature T0 ; select extruder 0 M104 S190 ;set extruder temperature ;home T0 ; select extruder 0 G28 ;move to dock T0 ; select extruder 0 G1 X70 Y200 F3000 ; move to position in front of dock G1 X70 Y240 F3000 ; move into dock ;heat bed M190 S70 ;wait for bed temperature ;heat extruder 0 T0 ; select extruder 0 M109 S190 ;wait for extruder temperature ;prime extruder 0 T0 ; select extruder 0 G1 E15 F200 ; reverse end of print retraction G1 E10 F50 ; extrude 10mm G92 E0 ;Reset E ;move out of dock T0 ; select extruder 0 G1 X80 Y240 F3000 ; move to position in dock G1 X80 Y200 F3000 ; move out of dock M117 Print starting ;BigBox Printer Start Script End G21 ; set units to millimeters G90 ; use absolute coordinates M82 ; use absolute distances for extrusion G92 E0 G1 E-1.40000 F4200.00000 G92 E0 G1 Z0.320 F6000.000 G1 X118.604 Y91.248 F6000.000 - Change it like this Spoiler: New start g-code ; lift nozzle above the print... remember the Z2.750 from bookmark2 ? add some safety to it. G1 Z25 F5000 T0 ; I have dual and I'm printing with the left extruder M107 ; disable fan M190 S70 ; set YOUR bed temperature M104 S220 ; set YOUR extruder temperature G28 ; home all axes ; again lift nozzle above the print... G1 Z25 F5000 M109 S220 ; wait for temperature to be reached G21 ; set units to millimeters G90 ; use absolute coordinates M82 ; use absolute distances for extrusion T0 ; select extruder 0 G92 E0 ;Reset E G1 E15 F200 ; extrude some plastic to be sure it's working G1 E1 ; retract some G92 E0 ;Reset E ; move to start position G1 X199.057 Y155.076 F1200 ; Lower the nozzel to start height, remove the feedrate so the last (1200) is used from now on. G1 Z2.750 ; same as BOOKMARK2... delete all lines down and including bookmark2 G1 X199.057 Y155.076 F1200.000 ; BOOKMARK1 ....A lot more lines to print... - Search and replace all "M106 S255;" with "M106 S0;" To disable the fan completely or set it lower if you like.- Save the file and print the file. - Remove the test extruded plastic and what the magic happen
I think this is simpler to accomplish with Simplify3D: you can use "Start printing at height". See here: https://www.simplify3d.com/support/tutorials/different-settings-for-different-regions-of-a-model/
This maybe true, but I did not have any luck with S3D it always does strange stuff, crashing into the bed.... "When I have time" TM I wil give it a try again.
Now I use S3D most of the time with success and @Michael Meixner is right, it is simpler with S3D and "Start printing at height"
