Mark Burton

Of course, the problem is really more than just underextrusion at the start of a wall following a retract/move/prime. Any time the extrusion rate changes suddenly will cause either under...

Hi, my Cura 4 variant (available at https://github.com/smartavionics/Cura/releases) has recently added an option to use z-hop when crossing top-level skins. You may find it solves your problem.

I can't load Greg's project because I don't have the machine definition but just using the model with my own profile I see similar travels across the middle of the...

Hi, yes, I loaded your project and I get the bad lines until I set the avoid distance to 7mm and, crucially, turned off z hops! Don't know why that...

Incidently, I have always been reluctant to use z hops on machines with leadscrews driving the z axis as I imagine it will cause a lot of wear. I do...

Looking at the Cura code, I think the need to turn off z hops to make the nozzle route around the outside is a bug. I will be removing that...

Hi. The Cura layer view is the main culprit here. It has never been able to display spiralized gcode well because it cannot correctly display lines whose Z value differs...

For a Cura variant that gets this right, see https://github.com/smartavionics/Cura/releases 

A quick look at the Cura 4 code shows that it only recognises relative extrusion (due to M83 in gcode) when the gcode flavour is RepRap.

Hi, please provide a sample project file that illustrates this problem, thanks.