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Cura 3.2.1 - Is Combing realy working?!

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Posted · Cura 3.2.1 - Is Combing realy working?!

I'm trying to print a TPU bracelet, and avoid retractions is a must, so the Combing Mode should resolve this, but I'm not getting what Combing is supposed to do.
What could be wrong?

 

Screenshot_1.thumb.jpg.31b30d17171de9a82fb8d97e402b736a.jpg

 

Tks

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Posted · Cura 3.2.1 - Is Combing realy working?!

Cura doesn't like to make large detours while combing. A detour length setting as in S3D would be nice.

However you can maybe improve the situation by disabling the "avoid printed parts" option. But you probably will not get rid of all the cross travels.

Using the "optimize perimeter" option might also help.

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Posted · Cura 3.2.1 - Is Combing realy working?!

Hi @Dim3nsioneer,

 

Thanks for your feedback, I already tried to disabling the "avoid printed parts", but this situation with the travel toolpaths maintains.
The "optimize perimeter" was also selected.

 

 

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Posted · Cura 3.2.1 - Is Combing realy working?!

I'm guessing cura isn't smart enough to figure out it can follow those skinny walls.  

 

Better to make it so you never ever see stringing.  I can usually tune my machine so that this amount of travels wouldn't matter and would be invisible.  Try printing all speeds at the same speeds (speed changes can cause issues) and try printing at 25mm/sec and as cold as possible - maybe 190C.  See if that eliminates all strings.

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Posted · Cura 3.2.1 - Is Combing realy working?!

All velocities are at 20mm/s, temperature is 225C, maybe I can go lower.

This are the results:

5aaa884cddbae_2018-03-1514_45_41.thumb.jpg.670611c4bccc7d4bf5a9cea01f5f1635.jpg

 

How can I get rid of this bloops?

5aaa885b0e62e_2018-03-1514_47_38.thumb.jpg.55e4b1b3793a8d8f33836280db07d7b5.jpg

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Posted · Cura 3.2.1 - Is Combing realy working?!

I think you may be able to reduce travel moves and therefore strings by enabling the "Optimize wall printing order" option implemented by @smartavionics

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Posted · Cura 3.2.1 - Is Combing realy working?!
1 hour ago, gr5 said:

I can usually tune my machine so that this amount of travels wouldn't matter and would be invisible.

 

@gr5  - I assume you forgot the two preconditions: "TPU" and "no retractions"...

If not... teach us the secrets! :p

 

BTW: @amagro  "Ultimaker TPU 95A" or something else?

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Posted · Cura 3.2.1 - Is Combing realy working?!

Does your printer have an extruder with bowden tube? In this case: IMHO a certain amount of stringing is unavoidable for flexible materials.

(For a direct extruder you could simple turn on retractions...)

 

You can fight against it (a bit) by printing as slow and cool as possible (but it needs some heat for a good layer bonding...).

And choose the speed for travel moves as high as possible on your printer.

 

 

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Posted (edited) · Cura 3.2.1 - Is Combing realy working?!

I'm using a BEETHEFIRST_plus, the extruder have a direct drive, and normally I don't have problems extruding any material, but with TPU is always more tricky.

Cura could also be more TPU friendly.

 

Edited by amagro

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