🖨 Print Calculators

Layer Height and Print Quality

Layer height is the single most impactful print setting, affecting both surface quality and print time. A common guideline is to use a layer height between 25% and 75% of the nozzle diameter. For a standard 0.4 mm nozzle, this means layer heights between 0.1 mm and 0.3 mm. A 0.1 mm layer height produces fine detail and smooth surfaces but takes two to three times as long as a 0.2 mm layer height print. A 0.3 mm layer height is fast but produces visible layer lines. The 0.2 mm layer height is the standard compromise for most functional prints.

Infill Percentage and Structural Strength

Infill refers to the internal structure printed inside a solid-looking object. A 0% infill print is hollow; 100% infill is completely solid. For decorative objects with no load requirements, 10–15% infill is sufficient. For general functional parts, 20–40% is the typical range. For structural parts under significant mechanical stress, 60–80% or higher may be needed. The infill pattern also matters: gyroid and honeycomb patterns provide more isotropic strength (equal in all directions) than grid or lines patterns. Doubling infill from 20% to 40% adds roughly 25% more material but significantly improves compression resistance.

Print Speed and Its Trade-offs

Print speed (typically 40–100 mm/s for standard FDM printing) affects both print time and quality. Higher speeds reduce print time proportionally but can introduce defects: ringing (ghosting/echoing of sharp features), under-extrusion at high volumetric flow rates, and poor layer adhesion at inadequate temperature. The maximum reliable print speed is constrained by the printer's volumetric flow rate — the maximum amount of molten plastic the hotend can process per second. A standard V6-style hotend has a volumetric limit of approximately 8–11 mm³/s; high-flow hotends (Volcano, Dragon HF) can reach 20–30 mm³/s.

Estimating Print Time

Slicer software provides print time estimates that are typically accurate to within 10–20% for well-calibrated printers. Actual print time depends on print speed, acceleration settings (Klipper's input shaper or Marlin's junction deviation), layer height, infill percentage, number of walls, and support structures. Travel moves (non-printing movements) add time proportional to the complexity of the model. Long prints exceeding 24 hours benefit from reliability improvements: good bed adhesion, enclosures to prevent thermal warping, and UPS power protection against power cuts.