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Tpu printing problem


andrei2306
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Posted (edited) · Tpu printing problem

Hello 

 

I have a problem when i print tpu in the middle you see when is moving to the other part is leaving a thin material and connect the parts. What i can do?

WhatsApp Image 2020-03-10 at 20.10.46.jpeg

Edited by andrei2306
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    Posted · Tpu printing problem
    1 minute ago, bagel-orb said:

    Not much. Printing TPU is difficult. Don't expect perfect quality.

     

    Other than that you can try fiddling with retraction settings.

    I am a beginner i don't understand too much what should i change to retract

    ?

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    Posted · Tpu printing problem

    I think your results look pretty good. Perhaps it's better to first get a hang of printing with PLA for a beginner.

     

    Printing TPU is difficult. Because retracting and unretracting takes time the nozzle can leak during that time. You might think you need to reduce that time and so increase the retraction speed. However, TPU can be slippery and fast movement might cause slippage.

     

    Retraction is performed because during extrusion you require a certain amount of pressure in the system in order for material to exit the system. That pressure is achieved by putting more material in the system. For flexible material you need to feed a lot more material to increase that pressure. To release that pressure you need to have a larger retraction distance, but increasing the retraction distance also increases the time it takes and so it increases the defects which occur during that time.

    TL;DR: increase retraction distance (at the cost of other defects)

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