Uploaded December 2025 | Updated September 2026, 2 weeks ago
🧪 In this video, I test Polymaker PET-GF15, a glass fiber–reinforced PET filament that is often positioned as a budget-friendly technical material.
I tested six different colors, using the same test methodology I apply across my filament reviews, to see how much the material — and the color — really matters.
🖨️ The video covers printability, brittleness, slicer settings, annealing behavior, dimensional changes, and a full mechanical test series including tensile strength, layer adhesion, shear, torsion, creep, bending, impact resistance, and temperature resistance.
📊 All test objects were printed and evaluated under controlled conditions so the results can be directly compared with other materials I’ve tested earlier on the channel. In this video, I also include reference results from my Polymaker PET-CF17 test for direct comparison.
Product link
đź”— Polymaker PET-GF15 (affiliate, US only):
us.polymaker.com/products/fiberon-pet-gf15?aff=49&utm_source=affiliately&utm_campaign=aff
Patreon
❤️ My Patreon supporters sometimes get early access to video and access to a summary spreadsheet that contains all previous test results, measured with the same test method.
This makes it easy to compare PET-GF15 with PET-CF, PA-based filaments, and other technical materials.
👉 patreon.com/mytechfun
Mentioned in the video
▶️ PET-CF filament test:
youtu.be/_yHECdbbCfs
▶️ Digital impact testing machine:
youtu.be/wBS8YLSOuwM
⏱️Chapters
0:00 Introduction
0:55 Specifications
3:06 Unboxing
3:43 Brittleness of filament
4:48 Slicer settings (wrench)
5:11 3D printing wrench
6:18 Final slicer settings
6:35 3D printing test objects
7:23 Two-color printing
7:47 Annealing
8:07 Shrinking
8:37 Tensile test
9:01 Layer adhesion
9:56 Shear test
11:09 Torsion test
12:16 Creep test
13:41 Temperature test
15:05 Bending test
15:44 Impact test(s)
17:54 All results
18:34 Conclusions
Tags
#Polymaker #PETGF15 #GlassFiberFilament #TechnicalFilament #3DPrinting #FilamentTest #MaterialTesting #Annealing #LayerAdhesion #TensileTest #ImpactTest #3DPrintStrength #MyTechFun
🧪 In this video, I test Polymaker PET-GF15, a glass fiber–reinforced PET filament that is often positioned as a budget-friendly technical material.
I tested six different colors, using the same test methodology I apply across my filament reviews, to see how much the material — and the color — really matters.
🖨️ The video covers printability, brittleness, slicer settings, annealing behavior, dimensional changes, and a full mechanical test series including tensile strength, layer adhesion, shear, torsion, creep, bending, impact resistance, and temperature resistance.
📊 All test objects were printed and evaluated under controlled conditions so the results can be directly compared with other materials I’ve tested earlier on the channel. In this video, I also include reference results from my Polymaker PET-CF17 test for direct comparison.
Product link
đź”— Polymaker PET-GF15 (affiliate, US only):
us.polymaker.com/products/fiberon-pet-gf15?aff=49&utm_source=affiliately&utm_campaign=aff
Patreon
❤️ My Patreon supporters sometimes get early access to video and access to a summary spreadsheet that contains all previous test results, measured with the same test method.
This makes it easy to compare PET-GF15 with PET-CF, PA-based filaments, and other technical materials.
👉 patreon.com/mytechfun
Mentioned in the video
▶️ PET-CF filament test:
youtu.be/_yHECdbbCfs
▶️ Digital impact testing machine:
youtu.be/wBS8YLSOuwM
⏱️Chapters
0:00 Introduction
0:55 Specifications
3:06 Unboxing
3:43 Brittleness of filament
4:48 Slicer settings (wrench)
5:11 3D printing wrench
6:18 Final slicer settings
6:35 3D printing test objects
7:23 Two-color printing
7:47 Annealing
8:07 Shrinking
8:37 Tensile test
9:01 Layer adhesion
9:56 Shear test
11:09 Torsion test
12:16 Creep test
13:41 Temperature test
15:05 Bending test
15:44 Impact test(s)
17:54 All results
18:34 Conclusions
Tags
#Polymaker #PETGF15 #GlassFiberFilament #TechnicalFilament #3DPrinting #FilamentTest #MaterialTesting #Annealing #LayerAdhesion #TensileTest #ImpactTest #3DPrintStrength #MyTechFun
