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printingWhiz

Printing TPU with PVA support

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Posted (edited) · Printing TPU with PVA support

Hi,

I am currently experimentally trying to find optimal settings to print TPU with PVA for the model shown below. What my main problem is that whenever I remove the PVA from the structure after it is done printing, the TPU has very poor quality (i.e rough and uneven surface). I tried increasing the distance between the support and the main material with marginal improvement. I would be glad for any advice on how to fix this issue.

 

Thanks

image.png

Edited by printingWhiz

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Posted · Printing TPU with PVA support

You might have better luck using either PVA (dissolves in water) or Breakaway.

 

Then again, the angles look like you may only need support to keep things from sagging at the hinges. You may be able to design minimal supports into your model and thus minimize the contact areas.

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Posted · Printing TPU with PVA support

Oh sorry I mistakenly wrote PLA instead of PVA. I am trying to reduce inter-material adhesiveness between PVA and TPU to improve the quality of the TPU material.

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Posted · Printing TPU with PVA support

I haven’t tried printing TPU with support. I modified my other printer to print ashore 60A TPE, but it’s a single extruder. I’ve been using PVA and Breakaway with PLA and Tough PLA.

 

Are you letting the PVA fully dissolve? Or are you being impatient (like me) and trying to remove it early?

 

I see four kinds of interfaces: the underside of the angled pieces, the tops of the lower angled pieces, the bottom of the top, and the top of the base. Is the support material providing interface floors an ceilings? Or is the TPU bridging across sparse support? Which of these are giving you problems?

 

Perhaps some pictures of the finished part may help?

 

You may be able to minimize the affected areas by designing your own support. For example, you could eliminate top-surface contact by building columns from the base plate on either side of the lower angled parts and then bridging to provide the support for the upper ones. Similar for the top part. Also, where you have room, you can use slopes to connect the support columns where you have enough vertical space.

 

you may also only need to support the angles for a few mm on either side of each hinge.

 

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Posted · Printing TPU with PVA support

This is a pic of the affected part. And yes I am also impatient and try to remove the parts quickly rather than let it dissolve. I will try to build my own support I guess but thank you for the help!

 

support.jpg

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Posted · Printing TPU with PVA support

That looks to me like the support is not creating an interface layer. Try the setting: Enable Support Interface. A description I found on Reddit:

"Generate a dense interface between the model and the support. This will create a skin at the top of the support on which the model is printed and at the bottom of the support, where it rests on the model."

This will greatly improve the quality of the part's surface.

 

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Posted · Printing TPU with PVA support

Hmm that particular setting was already activated by default. Should I try to play around with support interface acceleration for example? It is defined as the acceleration with which the roofs and floors of support are printed. Printing them at lower acceleration can improve overhang quality.

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