Your 3D Printer's First Day: The Complete Setup Checklist Before Your First Print

Unbox and place the printer before you power it on

Hold on to the box and the foam inserts. If the printer ever has to go back under warranty, sellers often expect the original packaging. If the machine is heavy, get a second person to help lift it out. Then set it on a sturdy, level surface. A wobbly desk or folding table feeds vibration into every move the print head makes.

Your manufacturer's quick-start guide lists the shipping restraints to remove: screws, zip ties, brackets or foam blocks that lock the axes in transit. Find every one of them before you flip the switch, because an axis that's still locked can make the very first self-test fail. While you're at it, make sure no cable or ribbon is pinched and that each belt still sits on its pulley.

Location matters too. Keep the printer away from open windows, heating vents and AC units, since drafts work against bed adhesion. Leave room behind it for the power cord and the spool. If it's going in a bedroom or home office, make sure the room gets decent airflow.

Run the setup wizard and every calibration

On first boot, most current printers walk you through a setup wizard on the screen. Follow it in order and don't skip steps. It typically checks the fans, heaters, motors and bed sensor, then runs the automatic calibrations the manufacturer built in. If the screen offers a firmware update, this is a good time to install it.

Treat those calibrations as part of setup, not a formality. Writing about a printer assembled from parts, the Prusa Knowledge Base says you run all of the calibrations the first time you switch it on, because they decide how well everything prints afterward. Prusa also notes that one poorly done step, such as belt tuning, is often the hidden reason other calibrations fail later.

That goes double for a kit, where every screw you tightened yourself can introduce play. Write down the result of each step. If a test fails, fix the cause and rerun it instead of moving on. To learn what each routine actually measures, see our 3D printer calibration guide.

Prep the build plate and load your first filament

Your first layer makes or breaks the print, and a good first layer starts with a clean surface. Prusa's documentation says to clean the print sheet with isopropyl alcohol (IPA), because on a greasy sheet, small contact areas pop loose mid-print. After cleaning, try to keep your fingers off the surface.

Check which plate came in the box. Prusa points out that its satin sheet, an all-rounder for most materials, grips PLA less than its smooth sheet does. If your printer ships with more than one surface, the manual will tell you which one suits the filament you have.

Stick with PLA for the first test. It's the most forgiving material, and it's what Prusa calls for in its own calibration print. Load it from the printer's filament menu, let the nozzle heat up, and purge until you get a steady strand. Keep the spool dry, too: Prusa flags damp filament as a cause of stringing and debris baked into the part. Our first layer guide covers nozzle height and first-layer squish step by step.

Set up the slicer for your first file

Install the slicer your manufacturer recommends and run its configuration wizard. According to the PrusaSlicer documentation, if you picked only one printer and nozzle size in the wizard, the right profile is already active. Otherwise, choose your machine from the drop-down in the right panel. Then pick a material preset, which sets temperature, speed and cooling for you.

Bring the model in by dragging it into the window or through the File menu. PrusaSlicer reads STL, STEP, 3MF, OBJ and AMF files. If the part lands at an odd angle, the Rotate tool or Place on Face will lay it flat on the virtual bed.

For layer height, Prusa suggests starting at 0.15 or 0.2 mm, which balances quality and print time. Infill around 15% generally works well. Turn on a brim when the footprint is small: it improves adhesion and usually peels off by hand. Still picking your software? Our guide to choosing a slicer compares the options.

Check the preview, then send the job

Prusa recommends previewing the G-code before every print. Once you slice, the preview opens. Drag the vertical slider to step through the layers one at a time, and make sure the overall shape matches your 3D model.

Mostly, you're looking for any section that would start printing in mid-air. Each layer rests on the one below, so an unsupported overhang droops into spaghetti. If you spot one, turn on supports, either everywhere or from the build plate only. Prusa also notes that very steep overhangs are hard for a printer to reproduce, which is another reason to orient the part carefully from the start.

To send the file, PrusaSlicer detects an SD card or USB drive and shows a dedicated export button, followed by an eject button so you can disconnect it safely. Other printers take jobs over the network or through an app, so follow your manufacturer's method. Either way, stay with the machine for the first few layers. That's when most failures show up, and you can stop the print before it wastes more filament.

Read your first test print like a diagnostic

Pick a short first model that actually tells you something. For its CORE One INDX, for example, Prusa recommends Otto, a calibration butterfly built to show how well the calibrations went. The test file your manufacturer preloads or offers in its app does the same job.

When the print finishes, look it over. A thin feature that broke loose mid-print usually points to a dirty sheet or a contact area that's too small: clean with IPA and add a brim, as Prusa advises. According to Prusa, rough or damaged surfaces at the far ends of fine details are a sign of poorly tuned belts. Strings and debris stuck in the print suggest wet filament instead.

If two parts designed to fit together need a little force and have only slight play, Prusa considers that a good result. Change one setting at a time and reprint the same test. If parts keep lifting off the plate, our bed adhesion troubleshooting page covers the causes and fixes.

Sources and limits

• Prusa Knowledge Base — First print with PrusaSlicer
• Prusa Knowledge Base — First print troubleshooting (CORE One / INDX)

We organize manufacturer and community documentation; we have not measured these products ourselves. The manual for your exact model takes precedence over general guidance.