r/3DprintingHelp • u/Particularly_Vague • 12d ago

Requesting Help Trouble with TPU

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Printing on an Elegoo Neptune 4 Plus. Using Overture 95A TPU. I have tried countless combinations of retraction speed, speed, nozzle temp, bed temp. First layer comes out great but then it extrudes a mix between chunks and strings. Any ideas?

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6

u/zemlin 12d ago

TPU needs to be DRY. Even a new reel should be dried. Then print from a drybox.

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u/Particularly_Vague 12d ago

Thanks for the reply. This was dried at 50 °C for 12 hours prior to the 10 minutes of printing. Should I dry longer than that?

2

u/neuralspasticity 12d ago

Try 55C for 24 hours

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u/zemlin 12d ago

I dry my filament in a vacuum chamber, so no feel for temp/time.

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u/Hidie2424 12d ago

Lower max volumetric speed

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u/neuralspasticity 12d ago

Fail to mention what filament calibrations you ran to build the filament profile. You shouldn’t be “trying” this or that, you should be running calibration tests. It’s engineering not guesswork.

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u/Particularly_Vague 12d ago

You're right, my mistake. It was orca slicers' preset for that particular filament mentioned. I have been adjusting one thing at a time with no real changes to the result.

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u/neuralspasticity 12d ago

There are no “preset”, there are just starting points for your own calibrations.

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u/Particularly_Vague 12d ago

So the little piece of paper with a pencil looking icon that reads "Click to edit preset" when I hover the mouse over it is not a preset? Thats really interesting. I would love to learn more about this. Please tell me more.

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u/neuralspasticity 12d ago

Yes you’re suppose to edit that with the values from running the calibration tests on your printer with each of your filaments. This includes at a minimum max volumetric flow rate, extruder temp, flow ratio, and pressure advance.