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Today I received my Monoprice Maker Ultimate 3D Printer. It is a rebranded Wanhao Duplicator 6 for reference. I am using the default settings for a Wanhao Duplicator 6 in Simplify3D.

Here is the Start G-Code that Simplify3D has setup for me via the Configuration Assistant:

G28 ; home all axes G92 E0 ; zero the extruded length G1 Z10 ; lower G1 E20 F200 ; purge nozzle quickly G1 E10 F60 ; purge nozzle slowly G92 E0 ; zero the extruded length again G1 E-1.5 F400 ; retract G1 X170 Z0 F9000 ; pull away filament G1 X180 F9000 ; wipe G1 Y20 F9000 ; wipe G1 E0 ; feed filament back 

The problem is that right before a print, the extruder squeezes out a bunch of filament making a nice little spiral tower. It is a waste of filament. I suspect it is all the purging in the Start Code that is doing it, but I don't know what I should change because I don't know what is necessary, so I am coming here to ask the question before I start experimenting. Has anyone had this problem? Does anyone know the solution?

Update: I tried printing one of the models that came on the SD card with the printer (I think it was created with Cura) and the Start G-code is different.

G21 ;metric values G90 ;absolute positioning M82 ;set extruder to absolute mode M107 ;start with the fan off G28 X0 Y0 ;move X/Y to min endstops G28 Z0 ;move Z to min endstops G1 Z15.0 F4800 ;move the platform down 15mm G92 E0 ;zero the extruded length G1 F200 E3 ;extrude 3mm of feed stock G92 E0 ;zero the extruded length again G1 F4800 ;Put printing message on LCD screen M117 Printing... 

It also uses absolute positioning. It got going without purging a bunch of unnecessary filament on that print. Now I am not sure how to combine these two to get the good working starting G-code. Any ideas?

1 Answer 1

Changing the Simplify3D start script to this will change the nozzle purge to the same length as what was on your SD card.

 G28 ; home all axes G92 E0 ; zero the extruded length G1 Z10 ; lower G1 E20 F200 ; purge nozzle quickly<---------Change E20 to E3, E is the extrusion length G1 E10 F60 ; purge nozzle slowly <----------Remove this line G92 E0 ; zero the extruded length again G1 E-1.5 F400 ; retract G1 X170 Z0 F9000 ; pull away filament G1 X180 F9000 ; wipe G1 Y20 F9000 ; wipe G1 E0 ; feed filament back 

The rest of it is just moves to try to clean the nozzle.