Your First 3D Print: The Complete Beginner's Checklist

You've got a brand new 3D printer. The box is open, the parts are laid out, and you're excited to print something amazing. I get it. But if you rush past the setup steps, your first print will almost certainly fail, and that first failure can be discouraging enough to make people shelve their printer for weeks.

Don't be that person. Follow this checklist, and your first print will come out clean. I've helped over a dozen friends set up their first printers, and this exact sequence works every time.

Phase 1: Assembly Verification

Even if your printer came "pre-assembled," check these things. Factory QC catches most issues, but not all.

• Frame squareness: Use a set square or measure diagonals. If your gantry isn't perpendicular to the Z-axis, every print will lean. Most printers have eccentric nuts on V-wheels, tighten these so the gantry slides smoothly without wobble.
• Belt tension: X and Y belts should be taut, pluck them like a guitar string. You want a low "twang," not a floppy "thud." Over-tight is better than too loose, but don't overdo it (you'll wear the stepper bearings).
• All connectors seated: Check every wire connector, especially the hotend thermistor and heater wires. A loose thermistor connector causes "thermal runaway" errors that'll stop prints mid-way.
• Bowden tube (if applicable): Push it all the way into the hotend fitting until it clicks. A gap between the tube and nozzle causes clogs. Seriously, this is the #1 assembly mistake on Bowden-style printers.

Phase 2: Bed Leveling

This is the step that makes or breaks your first print. Even printers with auto bed leveling need a rough manual level first.

For manual leveling (paper method):

1. Preheat the bed to your PLA temperature (60°C), the bed expands when heated, so leveling cold gives wrong results
2. Home all axes (usually a button or menu option)
3. Disable the stepper motors so you can move the printhead by hand
4. Place a sheet of regular printer paper between the nozzle and bed
5. Move the nozzle to each corner and adjust the leveling knob until you feel slight friction when pulling the paper, you should be able to slide it but feel the nozzle dragging on it
6. Repeat all four corners twice (adjusting one corner changes the others slightly)
7. Check the center, it should have the same paper feel as the corners

For auto bed leveling (BLTouch, CRTouch, inductive):

1. Run the automatic leveling routine (your printer's menu will have this)
2. Print a first-layer test and adjust the Z-offset. This is the critical part, the probe tells the printer the bed shape, but Z-offset tells it how close to actually print. Start at the default and lower by 0.02 mm increments until the first layer is slightly squished but not transparent.

Phase 3: Filament Loading

Thread your filament correctly the first time to avoid jams later:

1. Cut the filament end at a 45° angle, a flat or frayed end can catch on the inside of the Bowden tube or extruder gears
2. Preheat the hotend to 200°C for PLA
3. Feed the filament through the extruder until you feel it hit the hotend
4. Push gently until filament oozes from the nozzle, push enough that the color is clean (not mixed with whatever was in the nozzle from factory testing)
5. Use your printer's "extrude" function to push 50 mm through and verify the extrusion is smooth and consistent

Phase 4: Slicer Setup

Download and install a slicer. My recommendations for beginners:

• Cura: Free, huge community, good default profiles for most printers
• PrusaSlicer: Free, slightly more advanced, excellent for Prusa and Bambu printers
• Bambu Studio: Free, required for Bambu printers, based on PrusaSlicer

Select your printer model in the slicer. Use the DEFAULT profile for your first print. Don't change anything, not the speed, not the temperature, not the infill. Defaults exist for a reason, and they work.

Phase 5: The First Print

Slice the benchy with defaults and start the print. Then do these things:

• Watch the entire first layer. Don't leave. It should be smooth, slightly squished (lines just touching), with no gaps between lines and no transparent spots.
• After 5 layers, check adhesion. Gently touch the corner of the print. It should be firmly stuck. If it slides or pops off, stop and re-level.
• After 15 minutes, check for stringing. If you see thin whiskers between travel moves, note it but don't stop. Stringing is tunable later.
• Let it finish. Resist the urge to abort at the first sign of imperfection. A completed imperfect print teaches you more than a dozen aborted ones.

After Your First Print

Congratulations, you made a thing from a digital file. That never stops being cool. Now evaluate:

• Bottom is smooth and squished? Bed level is good. Move on.
• Stringing between parts? Increase retraction by 1 mm and retest.
• Layer lines are uneven? Check belt tension and eccentric nuts.
• Dimensions are off? Calibrate esteps (plenty of guides for this, it's your second project).

Your first print doesn't need to be perfect. It needs to complete. Everything after that is incremental improvement, and that's where the real fun of 3D printing lives.