Desktop FDM 3D printing
Every print defect is a symptom. This is how you find the cause.
Practical, mechanism-first guides for the problems that actually show up on desktop printers — stringing, warping, layer lines, weak first layers — plus the calibration steps that prevent most of them.
Three real defects, three different root causes. Click one.
Where to start
Three pillars, everything else hangs off them
Print Quality Troubleshooting
Diagnose and fix the defects that show up on the part itself — stringing, warping, visible layer lines, weak first layers, and extrusion problems.
Read the guide →3D Printer Calibration
The measurements and tuning passes that make everything else work — steps per mm, flow rate, retraction, and a level bed.
Read the guide →Filament & Materials
What PLA, PETG, ABS and ASA actually do differently at the nozzle, and how to choose and set up for each one.
Read the guide →Editor's picks
Where most people start
Print Quality
Stringing in 3D Prints: Causes and How to Fix It
Thin wisps of plastic between separate parts of a print almost always trace back to temperature or retraction. Here's how to tell which one, and what to change.
Calibration
How to Tune Retraction Settings to Stop Stringing
A printed retraction test isolates distance and speed from every other variable, so you can find the actual threshold for your printer and filament.
Materials
PETG Printing Guide: Settings, Stringing, and Adhesion
PETG behaves differently enough from PLA that copying a PLA profile causes most of the problems people blame on the material itself.
Print Quality
3D Print Warping: Why Corners Lift and How to Stop It
Warping is uneven shrinkage pulling a part off the bed, usually starting at corners. Here's what actually controls it, from bed temperature to enclosures.