Troubleshooting Archives - 3d Print World

Technical illustration of a dark FDM-printed rectangular container with visible layer lines, a vertical seam of blobs, swollen lower corners, and scattered surface zits, surrounded by circular magnified detail callouts and a printer nozzle above.

Blobs and Zits on FDM Prints: What Each Pattern Tells You

by 3d Omen
October 18, 2026

Learn to diagnose FDM blobs and zits by where they appear, from vertical Z seams and swollen corners to travel dots, wet-filament defects, and pause marks.

Side-by-side cutaway illustration of two metal 3D-printer hot ends: the left nozzle extrudes a smooth white filament line, while the right nozzle contains a dark obstruction and releases an uneven curled strand. A filament spool and workshop tools are blurred in the background.

Partial Nozzle Clogs: Diagnose Them Before Replacing Parts

by 3d Omen
October 11, 2026

Learn how to distinguish a partial nozzle clog from first-layer restriction, heat creep, wet filament, extruder trouble, and excessive flow demand.