Diagnostic group

Visible print failures

Pick the page that looks closest to the failed part, then run its small proof print before changing a profile.

13 diagnostic pages First test Start with visual diagnosis and the page's STL. Stop after one useful signal

Start here

Open the page that matches your evidence most closely.

Visible print failures 3D Print Layer Shift Fix Power off and inspect belt tension, pulley grub screws, cable paths, and the printed part for impact marks. Visible print failures 3D Print Stringing Fix Run the two-tower STL once unchanged, then repeat it 5 C cooler unless the first print shows popping or rough wet-filament fuzz. Visible print failures 3D Print Warping Fix Wash the plate, verify first-layer squish, and confirm the bed reaches the material profile temperature. Visible print failures Bed Adhesion Troubleshooting Run the five-patch first-layer test after washing the plate.

Cartesian and CoreXY FDM printers

3D Print Layer Shift Fix

Fix 3D print layer shifts by checking belts, pulleys, collisions, cable drag, acceleration, and motion limits before changing slicer cosmetics.

Inspect collision marks and repeat a small motion cube. FDM printers, PLA, PETG, TPU, OrcaSlicer, Bambu Studio

3D Print Stringing Fix

Fix PLA or PETG stringing with one two-tower test. Separate heat, wet filament, Bowden/direct-drive retraction, z-seam blobs, and OrcaSlicer pressure advance before buying parts.

Print the two-tower STL at current settings, then repeat 5 C cooler. FDM printers, PLA, PETG, ASA, ABS, PEI build plates

3D Print Warping Fix

Fix 3D print warping by checking plate cleanliness, first-layer squish, bed temperature, cooling, and enclosure needs in the right order.

Clean plate and print first-layer patch before a warp coupon. PEI, textured sheets, glass beds, PLA, PETG, TPU, ASA

Bed Adhesion Troubleshooting

Bed Adhesion Troubleshooting: practical first checks, one-variable changes, warnings, and verification steps for fixing the print without guessing through slicer settings.

Run the five-patch first-layer test after washing the plate. FDM hotends, brass and hardened nozzles, filled filament

Clogged Nozzle Fix

Fix a clogged 3D printer nozzle by confirming free-air extrusion, checking filament residue, cleaning safely, and replacing only when the nozzle is worn or blocked.

Extrude into free air, then print the single-wall flow box. PETG, smooth PEI, textured PEI, first layer, build plates

PETG Sticking Too Hard To PEI

Stop PETG from damaging PEI by checking first-layer squish, bed temperature, release layer, smooth vs textured PEI, and cooldown before replacing the plate.

Run the five-patch first-layer test after washing the plate. FDM printers, nozzle swaps, first layer, PEI plates

Poor First Layer After Nozzle Change

Fix a poor first layer after changing a nozzle by checking nozzle seating, Z offset, bed contact, flow, and plate cleanliness in order.

Run the five-patch first-layer test after washing the plate. FDM printers, auto bed leveling, PEI plates, Bambu, Prusa, Klipper

Poor First Layer Fix

Fix poor first layers by checking plate cleanliness, Z offset, bed mesh, probe setup, and first-layer speed with one simple patch test.

Wash the plate, then print the five-patch first-layer STL in the same bed area. FDM printers, Bowden, direct drive, PLA, PETG, TPU

Under Extrusion Fix

Fix under extrusion by checking the filament path, partial clogs, extruder grip, temperature, and volumetric speed before raising slicer flow.

Extrude into free air, then print the single-wall flow box. Bambu AMS, PLA, PETG, cardboard spools, dry storage

Bambu AMS Filament Tangles

Bambu AMS Filament Tangles: practical first checks, one-variable changes, warnings, and verification steps for fixing the print without guessing through slicer settings.

Print the two-tower test and lower temperature 5 C. FDM printers, PLA, PETG, calibration cubes, dimensional parts

Elephant Foot Fix

Elephant Foot Fix: practical first checks, one-variable changes, warnings, and verification steps for fixing the print without guessing through slicer settings.

Run the five-patch first-layer test after washing the plate. FDM slicers, flow calibration, PLA, PETG

Over Extrusion Fix

Over Extrusion Fix: practical first checks, one-variable changes, warnings, and verification steps for fixing the print without guessing through slicer settings.

Force seam to one corner and print the seam tower. FDM slicers, OrcaSlicer, Bambu Studio, Klipper

Z Seam Blob Fix

Fix z-seam blobs by proving whether the blob follows the seam, then choosing pressure advance, wipe, coast, retraction, or seam-position changes with a small seam test STL.

Force seam to one corner and print the seam tower.