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I'm looking for tips on Spiralize with TPU

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Posted · I'm looking for tips on Spiralize with TPU

I'm trying to print a small bellows.  OD is about 20mm.  It needs to allow articulation so I'm printing in TPU from a CURA slice with Spiralize.  The bellows part of it works terrific but I can't get the top of it to complete.  I have only tried without support, to this point.  I could print this in PLA and get 10 good parts out of 10.


It seems like this could be a case of a poor choice of gemetry.  I can modify the nozzle portion of this part but I thought I'd ask the group first.


I'm using an off-brand of filament (3d Sigma) that I have left over from another project but it's in a dry case and I don't suspect moisture problems.


Printer is a Creality CR-10S Pro.


Any TPU printing wisdom would be appreciated.


I've tried the following:


- Print speeds from 15 ~ 40 mm/s

- line thickness 0.4 to 0.7mm

- temps 215~225C

- I've made the nozzle angle as steep as 45 degrees (the pic shows a 40* version)





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    Posted · I'm looking for tips on Spiralize with TPU

    Quick follow-up.


    This bellows doesn't move very often so I am thinking of using PETG as a backup, at 0.08 or 0.12 layer height with spiralize.  I don't know how long it would last but it might be worth a shot.

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    Posted · I'm looking for tips on Spiralize with TPU

    You might try changing the line width also.  It's usually set to the nozzle diameter but can be different.  Try .6 line width and bump the flow rate % a bit.  If the top cone had steeper sides the individual lines might bond instead of falling into the center.

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