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So how strong is PETG filament?

I making the leap to PETG filament – I’ve been printing for some years with regular PLA – mostly because it is so easy to use. And PLA doesn’t require much from the 3D printer (or the operator). But when you need stronger functional 3D prints you will realize that PLA just isn’t strong enough. I’ve been wanting to take the leap to a stronger material but not without some concerns.

Also read – Printing with PLA

My current 3D printer is the Artillery X1 and I am running all stock – no modifications except a more sturdy Z frame.

The X1 comes with a cheap PTFE tube that isn’t as good as a true Capricorn tube – since the X1 uses a Volcano E3D style hotend the tube goes all the way to the nozzle.

I’ve been somewhat hesitant to try PETG filament since it requires more heat and I’ve been worried that the cheap PTFE tube would deform.
But after having read several reviews of the Eryone filament it seemed that it might be possible to print with PETG filament after all.

PETG is an excellent choice for functional 3D prints as it is easy to print and almost has the strength of ABS – but without the warping and you don’t need an enclosure. Although PETG requires hotter nozzle temperatures and less cooling than PLA, it is still much easier than ABS that is hard to succeed with.

What PETG filament to buy?

I bought PETG filament from Eryone on Amazon.de as many of my friends in the 3D printing community had recommended this brand.

I didn’t have any prior experience with Eryone filaments so I didn’t know what to expect from them. But the overall reviews of their products indicated that Eryone is supplying quality filament.

The package from Amazon arrived within a couple of days – and my initial impressions of the black PETG filament was very good. The roll was tightly vacuum sealed and the roll was also further packed in isolation wrap. You can see a video of me opening the filament here – it is possible to hear the vacuum seal being released.

When printing with my 3D printer I’ve tried numerous different filament brands and one the most important properties of a good filament is whether is within the promised tolerances.

When I measured the filament from Eryone it should be 1.75 mm as stated on the roll. And Eryone are true to their claim as I measured the width of filament on 3-4 different locations and the measurements where all within the promised tolerances. Good work Eryone!

Measurement of the Eryone PETG filament

PETG filament Model and Settings in Cura

I needed a hook to carry my large splitting ax – it weighs almost 10 kg, I also wanted to test specifically how strong the Eryone PETG actually was.

I browsed Thingiverse for different hooks as I needed a structural sound design. I wanted to test the filament and not a flawed design.
Hook from Thingiverse – Yet Another Wall Hook

Cura setting for the Eryone PETG

  • Temperature > 240 – Eryone suggest 230-250 degrees
  • Bed > 80 degrees – and kapton tape to protect the glass bed
  • Infill percentage > 55% – could have gone even higher
  • Infill pattern > Cubic – since it is known to be very strong
  • Cooling > Off – since it is a simple model and I need extra strength
  • Speed > 50mm/s – while setting travel speed to 250mm/s to reduce stringing

Results

The print came out very successful and without any stringing or other artifacts such as blobs. The model even has a large overhang which I first realized after printing – so I should probably have used some kind of support.

I am quite pleased the result – the image below shows the result with my Artillery X1 (v4) and Eryone PETG filament.
3D printed hook

And it can carry the heavy ax without any problem.

PETG filament. 3D printed hook carrying heavy splitting ax

Printing yet another PETG thing

Since the Eryone filament worked so well I decided to print something completely different. A Quadcopter 5-6″ frame.

The cura settings where more or less the same except from a slightly lower flow rate of 96%. My experience with PETG is that blobs and stringing can be prevented with lower flow rate.

I also dropped the temperature a little to 237 degrees.

Once again I super pleased with results – the frame is beautiful and actually quite strong.

PETG Filament - Printing Quad frame
Infil – 60% Cubic is strong
Printing a Quad frame

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