niamleeson
Posts: 18
Joined: Tue May 31, 2016 9:34 am

How to make printer extrude a little after print is done?

Thu Jun 16, 2016 4:38 pm

Hello,

How can I make the printer extrude a little bit of filament (about 3cm ~ 5cm) off the platform when it is done printing?

My starting script is:
M73 P0 ; enable build progress
G162 X Y F3000 ; home XY maximum
G161 Z F1200 ; home Z minimum
G92 Z-5 ; set Z to -5
G1 Z0 ; move Z to 0
G161 Z F100 ; home Z slowly
M132 X Y Z A B ; recall home offsets
M135 T0 ; load right extruder offsets
G1 X150 Y-70 Z30 F9000 ; move to wait position right hand side of the table
G130 X20 Y20 Z20 A20 B20 ; lower stepper Vrefs while heating
M126 S[fan_speed_pwm]
M140 S[bed0_temperature] T0
M134 T0 ; stabilize bed temperature
M104 S[extruder1_temperature] T1
M133 T1 ; stabilize left extruder temperature
G130 X127 Y127 Z40 A127 B127 ; default stepper Vrefs
G92 A0 B0 ; zero extruders
G1 Z0.3 ; position nozzle
M135 T1 ; left tool
G1 X-90 Y-70 E25 F1200 ; prime nozzle
G1 X-100 Y-70 F180 ; Wait for ooze
G1 X-110 Y-70 F5000 ; Fast wipe
G1 Z0.5 F100 ; Lift
G92 A0 B0 ; zero extruders
M73 P1 ; @body (notify GPX body has started)

My ending script is:
M73 P100 ; end build progress
G1 Z150 F1000 ; send Z axis to bottom of machine
M140 S0 T0 ; cool down HBP
M104 S0 T0 ; cool down right extruder
M104 S0 T1 ; cool down left extruder
M127 ; stop blower fan
G162 X Y F3000 ; home XY maximum
M18 ; disable stepper
M72 P1 ; play Ta-Da song

Thank you!

KC_703
Posts: 238
Joined: Tue Aug 26, 2014 5:23 pm

Re: How to make printer extrude a little after print is done

Fri Jun 17, 2016 2:46 am

Add "G1 E##" where ## is the millimeters you want to extrude to the beginning of your end script. Probably after the first line so the extrusion happens at the right hotend temp.

niamleeson
Posts: 18
Joined: Tue May 31, 2016 9:34 am

Re: How to make printer extrude a little after print is done

Fri Jun 17, 2016 3:55 am

KC_703 wrote:Add "G1 E##" where ## is the millimeters you want to extrude to the beginning of your end script. Probably after the first line so the extrusion happens at the right hotend temp.
Thank you for your answer! But what if I want to extrude off the platform? Should I write like this? What's a typical load filament speed? I set it to F1200 but I wonder if that is too slow?

M73 P100 ; end build progress
G1 Z150 F1000 ; send Z axis to bottom of machine
G1 X130 X-70 E50 F1200 ; prime nozzle <------------- Does this move the head first then extrude, or extrude while moving?
M140 S0 T0 ; cool down HBP
M104 S0 T0 ; cool down right extruder
M104 S0 T1 ; cool down left extruder
M127 ; stop blower fan
G162 X Y F3000 ; home XY maximum
M18 ; disable stepper
M72 P1 ; play Ta-Da song

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