PETG not flowing fast enough | 3D Printing | Page 1

steady oriole Nov 30, 2023, 6:52 AM

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My Ender 3 Pro is currently printing eSUN Filament (PETG Red)

Speed: 50mm/s
Temperature: 240 C
Nozzle: 0.4mm

Extruder has been constantly skipping more and more until I find a clog above my nozzle

I've tried extruding manually with Klipper's extrude option. 4-5mm^3/s will cause skipping. 3mm^3/s seems to be fine. I'm at my wit's end on this. Please help!

solid creekBOT Nov 30, 2023, 6:52 AM

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steady oriole My Ender 3 Pro is currently printing eSUN Filament (PETG Red) Speed: 50mm/s Tem...

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AI Help

It sounds like you are experiencing issues with filament skipping and clogging on your Ender 3 Pro while using PETG filament. Here are a few troubleshooting steps you can try:

Check your nozzle: Make sure your nozzle is clean and clear of any obstructions. Heat up the nozzle and carefully use a thin needle or nozzle cleaning tool to remove any dirt or filament residue that may be clogging it.
Increase temperature: PETG filament typically requires higher temperatures to properly melt and extrude. Try gradually increasing the temperature in increments of 5°C and observe if the skipping issue improves. Moving towards 245-250°C might be worth a try.
Adjust the extrusion multiplier: Sometimes the flow rate needs to be adjusted for different filaments. Lowering the extrusion multiplier value in your slicer software (e.g., Cura or PrusaSlicer) can help reduce the filament flow and prevent skipping. Try reducing it by 5-10% and see if it improves the issue.
Check extruder te...

harsh snow Nov 30, 2023, 10:01 AM

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Ahem are you printing with the stock hotend with the teflon tube in direct contact with the nozzle? If so, please stop and get an all metal hotend. You are slowly decomposing the teflon tube and release its fumes into the surroundings. Google teflon fever.

solid creekBOT Nov 30, 2023, 10:01 AM

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PTFE Temperatures
TL;DR: Do not heat PTFE above 230C for long periods of time, and never above 260C.

Polytetrafluoroethylene, a.k.a. PTFE, a.k.a. Teflon, is a polymer renowned for its extremely low coefficient of friction. It is used in many industrial and domestic applications, most famously in non-stick pans. Relevant to us, PTFE is used as Bowden tubing and heatbreak liners in 3D printers for ease of filament transport. This places the polymer in close contact with areas where high temperatures are routinely encountered.

PTFE will begin to pyrolyze at 220 degrees centigrade. It will begin off-gassing at significant amounts at 240. At 260, this process will have accelerated to the point where the structural integrity of your tubing will have been compromised. Most contemporary citations focus not on the physical decomposition of PTFE but on the health effects of byproducts used in its manufacture. However one major health risk is directly attributable to PTFE pyrolysis: Polymer fume fever.

Polymer fume fever, or colloquially "Teflon flu", is a condition caused by overexposure to fumes (over the course of 4-8 hours) caused by the decomposition of PTFE. The advanced respiratory metabolism of birds make them particularly sensitive to polymer fumes, which leaves them at high risk of death in environments where such fumes are prevalent. Further reading is linked below.

#PETG not flowing fast enough