Slicer basics
A slicer turns a 3D model into printer movements. Begin with a profile made for your exact printer, nozzle and material, then change only what the part needs.
The seven settings that matter first
Layer height
Smaller layers show finer vertical detail but take longer. With a 0.4 mm nozzle, 0.20 mm is a common learning profile. Stay within the nozzle and printer profile’s supported range.
Walls
Walls often contribute more useful strength than extreme infill. Two or three walls are a practical baseline for ordinary models; functional parts may need more after considering load direction.
Infill
Infill supports top surfaces and changes stiffness. Many prototypes need only moderate infill. Raising it to 100% can add time, material and internal stress without solving a weak wall or poor orientation.
Nozzle and bed temperature
Use the filament maker’s range as a boundary and the printer profile as a starting point. Tune with a small test while checking flow, bonding and surface quality together.
Speed
The value printed on a printer box is not a universal quality speed. Volumetric flow, acceleration, cooling and geometry can all become the real limit.
Supports
Supports help print steep overhangs but affect surface finish. First rotate the model to reduce unsupported areas, then use supports only where the geometry needs them.
Retraction
Retraction reduces oozing during travel. Direct-drive and Bowden systems need different distances. Excessive retraction can grind filament or contribute to heat creep, so stay near the tested printer profile.
A safe tuning loop
- Save a copy of the known-working profile.
- Use one small repeatable test model.
- Change one setting by a modest step.
- Record both the improvement and any new defect.
- Return to the baseline when the result becomes ambiguous.
Put the settings into practice
Use these guides when one of the core slicer decisions needs a focused test.