PrusaSlicer is free, open-source, and works with virtually any FDM printer. But opening it for the first time can feel overwhelming. This guide focuses on the settings that matter most — and skips everything you don't need to touch yet.
Layer Height
Layer height controls print quality and speed. A good starting point is 0.2 mm — it's the sweet spot between detail and print time. Drop to 0.1 mm for highly detailed models; go up to 0.3 mm for fast, structural prints where looks don't matter.
Infill Percentage and Pattern
Infill determines how solid the inside of your print is. For most decorative prints, 15–20% is plenty. For functional or load-bearing parts, go to 40% or higher. The Gyroid pattern is popular for its even strength in all directions; Grid is fast and reliable for general use.
Supports
Supports are auto-generated structures that hold up overhanging parts during printing. Enable them when your model has overhangs steeper than about 45°. In PrusaSlicer, switch from Normal to Organic supports — they're easier to remove and leave a cleaner surface finish.
Print Speed
Faster isn't always better. The default speed profile in PrusaSlicer is a good starting point. If you're seeing quality issues, reduce the speed by 20–30%. For the first layer specifically, always print slow — 20–25 mm/s — to ensure good bed adhesion.
First Layer Calibration
The most important thing in PrusaSlicer (and 3D printing in general) is the first layer. Use the Live Adjust Z feature on your printer, or run a first-layer calibration print. You're looking for slightly squished lines with no gaps — like a smooth, continuous surface.
Slicing Your First Model
Once you have your settings dialed in: import your STL, orient it flat-side down on the bed, hit Slice, and preview the result layer by layer before exporting to your printer.
Need a model to slice? Browse 2 million+ free STL files on 3DSEARCH across Printables, Thingiverse, MakerWorld, and more.
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