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1

I also had the extruder drive slipping backwards (clicking sound) as well and narrowed it down to a Cura update that had changed my Ender 3 machine settings from Marlin to Marlin (volume metric). Once changed back to Marlin, all is well now. No over extruding. Before reversing the change, I had to reduce the flow rate to 53 %. Now, I’m back to 100 % and ...


0

I wouldn't worry about that overhang. It should settle in a few layers. Just make sure you have a decent cooling fan on it. Given the fact that you are making a helmet, I assume you are going to sand and apply putty to the whole thing at least 2 times and then sand in increasing grit. A little filing on that overhang will be an easy task.


2

If your printer has only one extruder, leave the Extruder G-Code empty. This setting is useful for multi-extruder printing (e.g. multicolor). The extruder G-Code runs each time you switch to and away from that extruder, and can be used for stuff such as retracting a filament when switching.


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It is a little annoying, what Cura is doing for me is forcing to wait. On start G-code I have: ; Ender 3 Custom Start G-code G92 E0 ; Reset Extruder ;*** Start Dual Nozzle/Bed Preheating *** M140 S60 ; start preheating the bed M104 S200 T0 ; start preheating hotend G28 ; home M190 S60 ; heat to Cura Bed setting M109 S200 ;*** End Preheating ***M420 S1; Load ...


3

I had the same issue exporting from Sketchup to STL. I imported my STL to Tinkercad and then exported it again and it resolved my issue. Tinkercad is a free and online tool.


0

Spiralize makes your model one layer thick on outer edges. What I do for a vase is set the top layer count to zero.


2

Likely underextrusion. The Ender 3's extruder is particularly bad at PETG and slips a lot unless you go really slow, like 3 mm³/s (about 40 mm/s at 0.2 mm layers and 0.4 mm line width) or lower. For a long time I thought this was a limitation of the material, at least without a really powerful hotend, and wondered why anyone liked it. But after replacing the ...


3

The density of the filament can be specified in the material model of the filament in Cura (Preferences -> Configure Cura... -> Materials and click on the material/filament you are using to slice your model for PETG), look at the value behind Density, the PETG filament I use is using 1.28 g/cm³ (PETG Economy Black -> Specification >). This field ...


0

Z offset in Cura Z offset in Cura is nothing more than an additional increase/decrease in height calculated throughout the whole file. This does require the installment of a plugin from the Ultimaker Cura "Marketplace" called "Z Offset Setting" by developer "fieldOfView". This should work (if not, this implies the plugin is ...


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