PETG Filament Review – Pros & Cons – Waterproof 3D Printing


PETG filament is a 3D printing material for desktop 3D printers that has been quickly gaining popularity. PETG is a polyethylene terephthalate (PET) that is glycol-modified. Before writing this review, we thought about adding the images of makes in PETG to the previous PET filament review that we published earlier. However, after trying to print in it, we realized that it was a different material that required different printing settings, and therefore it deserved a proper review and its separate photo gallery. It is known to be waterproof, but do the models come out really waterproof when printed with desktop 3D printers? Let’s check where PETG filament is used together with its Pros and Cons.

PETG Filament Review - Waterproof Dishes For Planters

PETG Filament Review – Waterproof Dishes For Planters
(Image: 3DWithUs)

PETG – Material for Anti-Splash Shields or Medical Face Shields

In its fight against COVID-19, 3D printing community came up with multiple shields/visors designs that can be printed with desktop 3D printers. This greatly helped to fill the initial vacuum until the manufacturers ramped up their production or refocused from other products in order to deliver professional PPE (personal protective equipment) for hospital stuff. And the best material for this task was PETG. Other materials could also be used. However, PLA shields/visors were less durable and could be damaged while disinfecting. When printing in ABS, there is a poor bed adhesion to watch out for, together with possible warping. End products in ABS may also get damaged during the disinfection process. We 3D printed 2 types of anti-splash visors using Prusa Research design RC3 and Protective Visor by 3DVerkstan. Please find the links below.

Prusa RC3 and 3DVerkstan Protective Visors 3D Printed in PETG Filament - Black and Green

Prusa RC3 and 3DVerkstan Protective Visors 3D Printed in PETG Filament – Black Prusament and Green Filament PM
(Image: 3DWithUs)

In view of emergency and quicker reaction time needed, a Protective Visor model by 3DVerkstan works better as it can be 3D printed in only 1.5 hours. The plastic volume required is very small. We managed to print 2 visors using the Filament PM PETG sample we received on the TCT Show. These small shields/visors can easily fit in a disinfection bath, and should be kept there for 5 min in certain chemicals, which is thoroughly described on the Prusa Research forum.

Black Prusament PETG Filament Review

We heard about PETG filament for some time, we saw it getting promoted on different 3D printing-related tradeshows, but we’ve never tried printing in it until we bought an upgrade for our Prusa i3 MK2. The upgrade package sent to us included a small spool of black Prusament PETG filament designated for printing our a few new parts. Honestly speaking, we struggled to 3D print those upgrade parts using the existing G-codes (Prusa Research MK2.5 Guide G-Codes). Our old 3D print bed struggled to hold a lot of tiny plastic bits. But after a few failed attempts we managed to tune the settings “live”, during the printing process, particularly greatly reducing the speed.

PETG Filament Review - Upgrade Parts for Prusa i3 MK2

Upgrade Parts for Prusa i3 MK2 – Black Prusament PETG
(Image: 3DWithUs)

PETG Filament Pros

Waterproof – if 3D printed with the right settings, objects can be used as flower water dishes
Stronger than PLA, less brittle than PET
Doesn’t produce such bad smell while printing as ABS



PETG Filament Cons

Bed adhesion – compared to PLA generally harder to get it right from the beginning
Stringing and oozing – may be caused by excessive retraction which will compromise the end result
Bridging – not the best choice for bridging compared to ABS

Vase Mode and Waterproof Mode are Not the Same

Great results can be achieved when 3D printing in PETG filament in a vase mode or a single corkscrew outline mode, the same as in PET. With no retraction, no stringing and oozing will occur. Depending on the color, the final print, more likely a vase, will look neat, shiny and have some level of transparency. But we found that, when printing with a 0.4 mm nozzle, one perimeter is not enough for the vase to hold the water. The models are very fragile, and micro holes appear very easily.

Waterproof 3D Printing - Tips & Tricks - Water Dish in Simplify3D

Waterproof 3D Printing – Tips & Tricks – Water Dish in Simplify3D
(Image: 3DWithUs)

We managed to achieve waterproof results in a normal mode by carefully watching the nozzle move in the slicer software and changing the setting to reduce the number of retractions to the possible minimum. The thickness of the object’s walls should be even. 0.8 mm worked well for a water dish for our planter.

PETG and PET Waterproof Dishes For Planters

PETG and PET (Red) Waterproof Dishes For Planters
(Image: 3DWithUs)

PETG 3D Printing Settings

Nozzle: 230-260°C; Bed: 80-90°C;

PETG Recycling

The most common plastic bottles are made of PET. And we see this material being widely recycled. Recycling PET and PETG together though gives a headache for recycling companies. Due to the different melting temperature requirements, PETG melts before PET and sticks in solid chips forming large clumps. This causes a problem when recycling those two materials together.

Special Note about rPETG

“r” stands for recycled. We are lucky to have a chance to test Filamentives rPETG filament. We have two filament samples: Random Mix White and Random Mix Clear. We had no problem 3D printing using recycled PETG filament. Clear and white water dishes work well and hold the water so far.

Filamentive rPETG Filament Samples - Random Mix White and Transparent

Filamentive rPETG Filament Samples – Random Mix White and Transparent
(Image: 3DWithUs)

PETG Branding

When buying PETG filament beware of using none brands. We suspect that some filament manufacturers and sellers may use PETG name on their PET products purely for branding. As PET clearly loses its keyword to “animal pet” in Google rankings, try typing “PET filament” instead in the search window. At the same time, PETG has its own firm place in this keyword dependent world.

PET and PETG

We had a great experience with the Taulman Red T-Glase PETT a few years ago. Apparently, manufacturers called it PETT purely for the branding and there was no difference to the PET formula. And we can repeat here that this is a different product to PETG as it looks different and requires different printing settings. When we found out that PET and PETG were close relatives, we were surprised. The tricks of chemistry do magic indeed. Check our full Pet Filament Review – with filament flow tests and original images.

Read More & Images: Pet Filament Review

3D Printed Candy Bowls - Red PET Filament

3D Printed Candy Bowls – Red PET Filament
(Image: 3DWithUs)


Source & Links:

Prusa Research RC3 and other face shields.
Protective Visor by 3DVerkstan
3D Printed Plant Pots and Self-Watering Planters – Waterproof 3D Printing
Pet Filament Review – Pros and Cons

Classic Brown Plant Pot and Water Dish - 3D Printed in PETG

Classic Brown Plant Pot and Water Dish – 3D Printed in PETG
(Image: 3DWithUs)


Lists & Tables: 3D Printing Filament for Desktop 3D Printers

It is important to use the right 3D printer filament material for the right job. Here you can find the list of materials available together with detailed reviews and picture galleries for the most used materials in desktop 3D printing. PLA, ABS, Wood, PETG, Nylon, Support, FLEX, … Read More

WRB Cube - Plastic, Metal & Wood Composites - 3D Printing Materials for Desktop 3D Printers

WRB Cube – Plastic, Metal & Wood Composites – 3D Printing Materials for Desktop 3D Printers
(Image: 3DWithUs)


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A unique resource which shares the firsthand experience in both 3D printing and 3D design. This experience is real and valuable. We expect our readers to find useful tips and tricks that they would need to start their own journey in this fascinating 3D world. 3DWithUs publishes original content. Our reviews, lists, and tables help to find your way around easily, all in one place. We are happy to share reviews and commentary from 3D designers, makers, manufacturers and software developers. Please contact us if you want to publish your content here.

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