Cura Glitch? or User Error?

[Jeffg1 2]

I had a glitch operating Cura with my UM3 so I did a fresh install.  After the install I tried running a print with my other machine (Monoprice Maker Select v2).  At first I thought I was having a hardware issue, but I have eliminated those causes.  The print does not stick to the surface at all.  It just beads up around the nozzle.  In the attached image I am comparing the Gcode for a file that came with the printer, and a new Gcode that I just made with my current copy of cura 2.3.1.  The Gcode on the left runs fine on my printer.  The one on the right fails to stick to the buildplate.  

If you look at the Gcode extruder positions, it is clear that the extrusion rate is significantly less than it should be.  

What controls this?  I have confirmed that I am specifying the correct filament diameter in Cura, and that my nozzle diameter is set correctly. The machine settings I used are Prusia Mendel i3, and I created a print profile using a previous known good Gcode import.  

[Jeffg1 2]

To try something different, I have a copy of Cura 21.02 (Lulzbot) and so I created a machine instance with the same settings and added the same part.  The screenshot below shows the output Gcode.  As you can see, it is extruding at a much faster rate, comparable to the Gcode file that came with my machine.

I think my next step is to uninstall Cura 2.3.1 and reinstall it again.

[nallath 1,120]

The UM3 uses volumetric extrusion. Most other printers use filament length.

[Jeffg1 2]

I'm not generating Gcode for an Ultimaker 3.  I created a custom machine.  See below for how I have it set up.  Below that image is another screenshot of the gcode side by side.  Look at the last line of code, and you can see that with Cura 2.3.1(on the left), the extruder will have extruded 1/4 of the material that the Cura 21.02 Lulzbot edition extrudes(on the right).  This is with all other profile settings identical between the two versions of Cura.  How can this be??

Edited January 31, 2017 by Guest

[nallath 1,120]

First off, the settings are definitely not the same. The left print takes 6 hours to complete, the right print takes ~5 hours to complete.

Why are you creating a custom machine in the first place? The people from Lulzbot just released a Beta of the new Cura with their machines in it.

[tinkergnome 927]

I miss one important thing in the screenshots...

What about the setting: "material diameter"?