5 Common 3D Printing Problems—and How to Fix Them
A failed print is frustrating, but it usually leaves clues. Look at where the problem begins, save a photo and change one variable at a time. Start with the correct printer and material profile before adjusting individual settings.
1. Fine strings between parts
What you see: thin strands spanning gaps or separate objects.
Check that you are using the correct material profile and the printer’s recommended retraction settings. Retraction pulls filament back during travel moves; copying a value from a different extruder can create new problems. Inspect the nozzle for residue using the printer’s cleaning instructions. If necessary, test a lower nozzle temperature within the filament’s recommended range.
2. The print will not stay on the bed
What you see: the first outline drags around or the model breaks free.
Check that the plate is seated correctly, clean it using the method specified for that surface, and confirm the material is compatible with it. Use the recommended first-layer profile. For a tall or narrow model, a brim can add contact area around its base; it does not fix a dirty plate.
3. Corners curl upwards
What you see: the model starts attached, but its corners lift as it grows.
This is warping. Recheck adhesion, avoid draughts around the printer and use the material’s recommended cooling and bed settings. A brim may help. Materials such as ABS can need a more controlled printing environment; follow your printer’s enclosure guidance instead of enclosing every material by default.
4. Gaps or missing material
What you see: thin walls, broken lines or gaps where solid plastic should be.
Check that the spool turns freely and the filament path is clear. Confirm the slicer’s nozzle and material settings, then inspect the feed gears and nozzle according to the printer’s maintenance guide. A partial blockage or feeding problem will not be solved simply by increasing flow.
5. An uneven or heavily ridged first layer
What you see: separate round lines, scraped patches or raised ridges.
Run the printer’s supported bed-levelling or first-layer calibration procedure. On machines with manual adjustment, a nozzle too far away leaves poorly joined lines; too close can restrict extrusion or damage the surface. Do not copy another printer’s Z-offset. Follow your own machine’s calibration instructions.
Make the next test useful
Repeat a small test with one change, then compare it with your saved photo. If inconsistent extrusion or surface defects persist, check our filament storage guide. For help choosing a material, email info@hotend.co.nz with your printer model, filament and a clear photo.
For additional visual examples, explore the community-maintained RepRap print troubleshooting guide. It covers a range of printer designs, so use your machine’s instructions for hardware-specific adjustments.