Spool3D News

The walls look good. The corners are clean. Then the printer reaches the top of the part and leaves holes, raised ridges or a rough patch right where everyone will see it. It is tempting to add more infill, increase flow or turn on ironing. Any of those changes might help a particular defect, but they solve different problems. A thin roof over sparse infill needs a different approach from a solid surface being scraped by the nozzle. Start by looking at what the top actually shows, then check t …

A 3D print can have a smooth surface, tidy corners and a clean top layer, then split the first time you tighten a screw or put it to use. Sometimes the failure happens before the print even finishes. A horizontal crack opens in a tall wall, and the printer keeps adding material above it. In other cases, the part stays intact on the build plate but breaks along a layer line when you bend or load it. Both situations deserve a closer look at layer adhesion: how well each new layer bonds to the one …

Under-extrusion happens when your 3D printer deposits less plastic than the slicer expects. The result may be obvious: missing lines, gaps between walls, weak infill, or entire sections that barely print. Other times, the print looks reasonably good until you hold it up to the light or discover how easily it breaks. The difficult part is that under-extrusion is a symptom, not a single problem. A partially clogged nozzle can cause it. So can a slipping extruder, filament that is difficult to pul …

A layer shift can ruin an otherwise perfect print in a fraction of a second. The printer may run normally for hours, make one bad movement, and then continue printing every remaining layer several millimetres away from where it belongs. That sudden offset is the clue. A true layer shift usually means the printer lost its expected X or Y position. The controller still thinks the toolhead or bed is where it should be, but the physical motion system slipped, skipped steps, hit something, or failed …

Stringing is one of those 3D printing problems that gets reduced to a single piece of advice: “Increase retraction.” Sometimes that works. Sometimes it makes almost no difference, because retraction was not the real problem in the first place. Stringing happens when molten filament continues to ooze from the nozzle while the toolhead is travelling across an open area. The printer is no longer supposed to be extruding, but a fine strand of plastic gets pulled between two parts of the …