3D Print Troubleshooting

Troubleshooting hub

A failed print is evidence. Match what you can see to the most likely causes, then test the simplest reversible fix first.

Before changing a setting

Let hot parts cool before touching the printer.
Photograph the defect and note the layer where it started.
Write down the current profile, material and temperatures.
Change one variable, then repeat the same small test.

Start with the visible symptom

First layer will not stick — loose lines, gaps or material following the nozzle.
Stringing — fine hairs between separate features.
Warping — corners curl away from the build plate.
Under-extrusion — weak, thin or missing lines.
Clogged nozzle — restricted or stopped filament flow.
Layer shift — part of the model suddenly moves sideways.

Use the guided filters

The full guide library can be filtered by symptom, print stage, material and difficulty. Each guide begins with observations, not a universal setting.

Open all troubleshooting guides

When to stop

Disconnect power and follow the manufacturer’s support process if you find damaged wiring, a loose mains connection, smoke, a persistent burning smell or uncontrolled heating. Software tuning is not a safe response to an electrical fault.

Describe what you can see

Choose a symptom first. Add the print stage or material only when you are sure. If the exact combination has no guide yet, the hub shows the closest useful matches instead of an empty page.

Recommended guides

Browse the latest guides, or choose a symptom, print stage or material above.

PETG-CF Filament: What Carbon Fiber Actually Adds to PETG

PETG-CF is regular PETG with 10 to 20 percent chopped carbon fiber mixed in, and it trades some of PETG's flexibility for stiffness, dimensional stability, and a hardened-nozzle requirement.

9 min read

Conductive Filament: What It’s Actually Good For (and Its Limits)

Conductive filament is carbon-black-loaded PLA, resistive enough for touch sensors and low-voltage signal traces, but nowhere close to copper wire. This guide covers the real resistivity numbers, honest use cases, and print settings.

7 min read

Clear Filament: Why 3D Printed Parts Come Out Frosted, Not See-Through

Clear and transparent filaments print translucent and frosted rather than glass-clear, because layer lines and micro-gaps scatter light in ways FDM printing cannot avoid. This guide covers which filaments come closest, which settings help, and what post-processing actually gets you to real transparency.

8 min read

PEEK Filament: Why It’s Out of Reach for Most 3D Printers

PEEK is the filament aerospace and medical device makers reach for when nothing else survives the heat, chemicals, or sterilization cycle. Printing it needs a nozzle over 400°C and a heated chamber, which is why almost no desktop printer can actually do it.

10 min read

0.4mm vs 0.6mm Nozzle: Detail or Speed and Strength

A 0.4mm nozzle is the default for a reason, but a 0.6mm nozzle pushes more plastic per pass, trading fine detail for faster prints and thicker walls at the same line count.

5 min read

Tree Supports vs Grid Supports: Which One Actually Comes Off Clean

Grid supports build dense, predictable columns under every overhang, while tree supports grow branches that touch only the points that need help, and the right choice depends on the model's shape more than personal preference.

5 min read

PEI vs Glass Build Plate: Adhesion or the Flattest Possible Finish

PEI sheets grip most filaments cold with no glue, while glass needs an adhesion aid for almost everything but leaves the flattest, glossiest bottom surface a build plate can produce.

5 min read

PTFE-Lined vs All-Metal Hotend: What Determines Your Max Temperature

A PTFE liner keeps friction low but limits nozzle temperature, while an all-metal hotend trades a little of that low friction for the high heat nylon, polycarbonate and other engineering filaments actually need.

6 min read

Delta vs Cartesian 3D Printer: Two Ways to Move a Nozzle

Delta printers move all three towers at once to position the nozzle, while cartesian machines drive each axis independently, and that single difference decides build volume shape, speed potential and how forgiving the printer is to calibrate.

5 min read

Creality Ender-5 Error Code Index

The base Creality Ender-5 has no numbered fault-code system in its official documentation. This article covers the plain-text fault messages the printer's stock 8-bit board and Marlin-based firmware actually display, sourced from Creality's own guide book and the Marlin firmware project.

Bambu Lab X1E HMS Error Index

A code-by-code reference to the Bambu Lab X1E's HMS error system, sourced directly from Bambu Lab's official wiki, covering the chamber heating faults unique to the X1E within the X1 family plus the AMS, network, lidar, and hotend faults it shares with the X1 Carbon.

Elegoo Neptune 4 Plus Error Code Index

A code-by-code reference to the error and fault messages documented for the Elegoo Neptune 4 Plus, sourced directly from Elegoo's official wiki, covering MCU shutdown faults, stepper driver errors, input shaper/accelerometer faults, and connectivity issues on the printer's Klipper-based firmware.