Ben Traje
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Filament Types: Notes & Slicer Tricks

24 Jul 26 (Today)

So far, I've only really messed around with PLA, PETG, and TPU. This is basically just a brain dump of things I've learned about them and other filaments before I organize it properly.

Filaments usually come in a bunch of different sub-classifications—Lite, Basic, Pure, Matte, Tough, etc.—and even the same colors can behave completely differently depending on the specific blend.

Abrasive Filaments

Abrasive materials will absolutely chew through a standard brass nozzle.

  • Hardware upgrades: You need to upgrade to a hardened steel or diamondback nozzle if you plan on printing with stuff like Carbon Fiber (CF) or Glass Fiber (GF) blends.
  • Sneaky abrasives: It's not just the heavy-duty engineering filaments that are abrasive. Specialty PLAs, like Wood PLA or Glow-in-the-Dark PLA, will also ruin a standard nozzle over time.
  • Bed adhesion: As a side note, the vast majority of first-layer failures across all these filaments are caused by improper bed adhesion due to invisible residues (like finger oils). A quick wash with dish soap and warm water usually fixes this.

The "High-Speed" Myth

Take marketing claims about "high-speed" filaments with a grain of salt. A standard printer's hotend is limited by the volume of plastic it can physically melt per second—known as the max volumetric flow rate. If your hotend can't melt the plastic fast enough, the theoretical "speed rating" of the filament itself is completely moot.

Translucent Filaments

Speed doesn't matter at all when you're printing translucent or clear filaments.

If you try to push translucent plastic at high speeds, it traps microscopic air bubbles and creates rough internal layer lines. Those tiny imperfections scatter light, turning what should be a clear print into a cloudy, opaque mess.

To get a clean, glassy finish with good light transmission:

  1. Print hot.
  2. Use thick layer heights.
  3. Drop the speed dramatically.

Because you already have to slow down so much just to get optical clarity, the flow-rate bottlenecks of non-high-flow formulas won't hold you back at all.

Matte Filaments

Even though Matte PLA has some shortcomings—specifically, the additives used to dull the shine make it noticeably more brittle than standard PLA—I still really prefer it. It hides layer lines incredibly well, and I just like looking at it a lot more.

How to fake a matte finish on glossy TPU

If you already have a standard, glossy TPU (like Polymaker PolyFlex or standard Bambu TPU) and want it to look matte, you can actually force the finish to change using just your slicer settings:

  • Print Colder and Slower: Glossiness in 3D printing happens when the plastic melts completely and cools slowly. If you drop your nozzle temperature by 5–10°C (printing at the absolute bottom of the recommended range) and print slowly, the plastic won't get as "shiny" and will cure with a duller finish.
  • Fuzzy Skin: Turning on the "Fuzzy Skin" setting in your slicer entirely removes the glossy plastic sheen. If you set the thickness to around 0.1mm and the point distance to 0.1mm, it adds a micro-texture to the outer walls that scatters light perfectly. It makes the print look and feel almost exactly like molded rubber.

Profiles & Presets

Always grab the latest tuned presets for your materials when you can.

So far, I've only really messed around with PLA, PETG, and TPU. This is basically just a brain dump of things I've learned about them and other filaments before I organize it properly.

Filaments usually come in a bunch of different sub-classifications—Lite, Basic, Pure, Matte, Tough, etc.—and even the same colors can behave completely differently depending on the specific blend.

Abrasive Filaments

Abrasive materials will absolutely chew through a standard brass nozzle.

  • Hardware upgrades: You need to upgrade to a hardened steel or diamondback nozzle if you plan on printing with stuff like Carbon Fiber (CF) or Glass Fiber (GF) blends.
  • Sneaky abrasives: It's not just the heavy-duty engineering filaments that are abrasive. Specialty PLAs, like Wood PLA or Glow-in-the-Dark PLA, will also ruin a standard nozzle over time.
  • Bed adhesion: As a side note, the vast majority of first-layer failures across all these filaments are caused by improper bed adhesion due to invisible residues (like finger oils). A quick wash with dish soap and warm water usually fixes this.

The "High-Speed" Myth

Take marketing claims about "high-speed" filaments with a grain of salt. A standard printer's hotend is limited by the volume of plastic it can physically melt per second—known as the max volumetric flow rate. If your hotend can't melt the plastic fast enough, the theoretical "speed rating" of the filament itself is completely moot.

Translucent Filaments

Speed doesn't matter at all when you're printing translucent or clear filaments.

If you try to push translucent plastic at high speeds, it traps microscopic air bubbles and creates rough internal layer lines. Those tiny imperfections scatter light, turning what should be a clear print into a cloudy, opaque mess.

To get a clean, glassy finish with good light transmission:

  1. Print hot.
  2. Use thick layer heights.
  3. Drop the speed dramatically.

Because you already have to slow down so much just to get optical clarity, the flow-rate bottlenecks of non-high-flow formulas won't hold you back at all.

Matte Filaments

Even though Matte PLA has some shortcomings—specifically, the additives used to dull the shine make it noticeably more brittle than standard PLA—I still really prefer it. It hides layer lines incredibly well, and I just like looking at it a lot more.

How to fake a matte finish on glossy TPU

If you already have a standard, glossy TPU (like Polymaker PolyFlex or standard Bambu TPU) and want it to look matte, you can actually force the finish to change using just your slicer settings:

  • Print Colder and Slower: Glossiness in 3D printing happens when the plastic melts completely and cools slowly. If you drop your nozzle temperature by 5–10°C (printing at the absolute bottom of the recommended range) and print slowly, the plastic won't get as "shiny" and will cure with a duller finish.
  • Fuzzy Skin: Turning on the "Fuzzy Skin" setting in your slicer entirely removes the glossy plastic sheen. If you set the thickness to around 0.1mm and the point distance to 0.1mm, it adds a micro-texture to the outer walls that scatters light perfectly. It makes the print look and feel almost exactly like molded rubber.

Profiles & Presets

Always grab the latest tuned presets for your materials when you can.

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title: "Filament Types: Chemistry, Quirks, and Slicer Tricks" publishedAt: "2026-07-24" summary: "A working brain dump on PLA, PETG, TPU, handling abrasives, and why generic slicer settings are a trap." tags: ["3d-printing", "bambulab", "filaments", "tpu", "slicer-settings"]

So far, I've primarily stuck to PLA, PETG, and TPU. This is a dump of how these materials actually behave under the hood, and why relying on default slicer profiles usually leads to failures.

The Trap of "Generic" Settings

Assuming all PLA behaves the same—or that the same brand's filament will print identically across different colors—is a trap. The "Generic PLA" profile in your slicer is a lowest-common-denominator baseline to prevent clogs, not an optimized profile. While everything may have PLA base, each PLA variation still has its own chemical composition and requires a separate dedicated settings.

If you are using Bambu Lab printers with Bambu Lab filaments, you are in luck, there is a default configuration for its own branded filament settings like Matte PLA, Silk PLA etc. While not entirely perfect, this guarantees you to a near perfect print.

For third party filaments, you need to check the manufacturer's specifications. For example, polymaker provides its own presets for each filament and its correponsindg printer. presets.polymaker.com

Why Color Changes Everything

Pigments are physical particles mixed into the plastic, and they fundamentally change how the material absorbs and retains heat.

  • White Filaments: Heavily loaded with Titanium Dioxide to achieve opacity. Titanium Dioxide is a thermal insulator, making the plastic significantly harder to melt. You almost always need to bump your nozzle temp by 5–10°C for White PLA compared to Black or Red of the exact same brand.
  • Black Filaments: Uses carbon-based soot, which transfers heat much more easily.

The takeaway: Run a Temperature Tower and a Flow Rate Calibration for every new spool sub-type and color, and save them as specific profiles.

Abrasive Filaments (CF, GF, Wood, Glow)

Abrasive materials will absolutely chew through standard hardware.

  • It’s not just the nozzle: Yes, you need a hardened steel or diamondback nozzle for Carbon Fiber (CF) or Glass Fiber (GF) blends, but you also need hardened extruder gears. Abrasives will grind down standard brass extruder teeth, leading to slipping and inconsistent extrusion.
  • Sneaky abrasives: Wood PLA and Glow-in-the-Dark PLA are notoriously abrasive. They will ruin a standard brass nozzle surprisingly fast.

The "High-Speed" Myth

Take marketing claims about "high-speed" filaments with a grain of salt. A printer's hotend is limited by its maximum volumetric flow rate—the physical volume of plastic it can melt per second (usually capped around 15-25 mm³/s for standard setups). If your hotend can't melt the plastic fast enough, the theoretical "speed rating" on the filament box is moot. You will just get under-extrusion.

But they are not a total fad either. For example, PETG-HF (High flow or High Speed) is fast but only relatively fast compared to its regular PETG counterpart. A regular PLA still prints faster than the PETG-HF.

Translucent Filaments

Speed doesn't matter at all when you're printing translucent or clear filaments. Because you have to slow down so much for optical clarity, the flow-rate bottlenecks of non-high-flow formulas won't hold you back.

If you push translucent plastic at normal speeds, it traps microscopic air bubbles and creates rough internal layer lines. Those tiny imperfections scatter light, turning a clear print cloudy and opaque.

Matte Filaments

My personal favorite! Normally the regular filaments has an evident sheen that is a tell tale of it being 3D Printed. Matte versions gives you diffused look and arguably much pleasing to the eyes. The trade-off is its much more weaker than its regular counterpart. But, I don't really mind, in general use case.

Faking a Matte Finish on Glossy TPU

If you have standard, glossy TPU (like Polymaker PolyFlex or Bambu TPU) and want a matte look, you can force the finish to change in the slicer:

  • Print Colder and Slower: Glossiness happens when plastic melts completely and cools slowly. Drop your nozzle temp by 5–10°C (absolute bottom of the recommended range) and print slowly. The plastic won't get "shiny" and will cure with a dull finish.
  • Fuzzy Skin: Turning on "Fuzzy Skin" in your slicer entirely removes the glossy sheen. Set thickness to 0.1mm and point distance to 0.1mm. It adds a micro-texture to the outer walls that scatters light, making the print look and feel almost exactly like molded rubber.

The Missing PETG Notes

Profiles & Presets

Always grab the latest tuned presets for your materials when you can.