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ultiarjan

Cura2.5 Spiralize multi material

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Can't you just use the simple sample project I PM'ed you?

I can make something different if you need something else.

If you need me to test print from your new code you can just PM me some gcode for UM3 .... Or if you have a Cura version with a possible fix I can also try it for you.

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Those gaps you see that are all aligned vertically are where the z-seam occurs. If you view using S3D, you won't see those gaps, it's a feature (some would argue a bug) of the Cura layer view that it doesn't fill those gaps. I have already mentioned this to a Cura developer and their view was that spiralize wasn't important enough to warrant fixing the layer view!

Screenshot_2017-03-30_11-55-04.png?raw=1

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The strange move is gone, so thats good, but the material transition is not the best, the strings on the side are easy to remove, but the blobs in front are difficult to nicely clean.

There was also extrusion from the "change position" to the print, on the skirt printing of the 2th material, causing a polluting blob on the first layer. As I don't have the project file I cant check your settings

T2.thumb.png.356cba7c1de8822a19f093ff5eae2d90.png

T2.thumb.png.356cba7c1de8822a19f093ff5eae2d90.png

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Hi, thanks for trying that. Well, a little progress. The blobs where the colours change are a worry, I need to look into how Cura does the material change. The little threads that appear on the right are weird, does that ever happen when not using spiralize?

I have made some changes, please try this one and let me know if anything is better or worse.

https://www.dropbox.com/s/lnjym92z2xw0dt7/UM3_SpiralMultiMaterial_2.zip?raw=1

I haven't changed any settings, I just open your project.

I also want to check how it works with models that alter with height, can you send

me a project with a small curved vase and multiple materials, please?

Thanks again for the help.

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Hi, thanks for the latest feedback.

The blobs in S3D mark where the retractions occur. If you turn off displaying retractions, they go away (on the screen, not from the plastic, unfortunately!) At the moment, I do not know why they are occurring. Do you see any blobs like that when you change material on non-spiralized prints?

The extra ridge does not show up on the S3D layer view so I am baffled by that as well.

The traffic cone would be interesting but I have no experience of creating multi-material prints. Could you please create a project containing a two-material cone and send it to me?

Thanks, Mark

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Hi, I have worked out where the blobs are coming from. Because the prime tower is not enabled, after the nozzle switch, it's extruding 16mm of filament onto the print. Enabling the prime tower will solve that but then it fails miserably because it builds the prime tower the same height as the cone as so it goes off to the tower every layer!

I think that what it needs is for the prime tower to only have one layer for each nozzle switch and for the print head to go up/down in z between the top of the prime tower and the top of the print. I don't even know if that is possible so I am going to open a new issue so that the cura devs can ponder it. Edit: Just done that but I can already see a big problem in that if the model is tall then it's not going to be possible to print a low prime tower without the hot end or some part of the mechanism striking the taller model. This may well be an intractable problem!

Sorry, no solution for multi-extruder spirals for the moment.

Thanks again for the help.

Edited by Guest

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A little string is not so bad, as easy to remove, but a blob is bad.

Yes, my thoughts exactly. So what I am currently thinking is that instead of printing a prime tower, it simply does the prime into thin air in the prime tower position and then moves to the spiral. I am working on doing that but currently can't find the right bit of code to alter (can you believe, it's all quite complicated, really!)

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