The A1 mini’s motor pushes the filament directly into the nozzle, so it only needs a small retraction. Retraction is the short pull-back of filament when the nozzle moves between parts. Set it to 1–3 mm at 20–40 mm/s in Bambu Studio. Keep travel moves fast, so the nozzle spends less time oozing in the air. The fastest route is the free Polymaker preset for your spool, from the Filament Preset Downloader. It is already tuned.

With the stock 0.4 mm nozzle, use layer heights between 0.1 and 0.3 mm. Use 0.2 mm for most prints. Go thinner for small, detailed pieces and thicker for speed. For Silk, speed matters more than layer height: stay at or under 150 mm/s to keep the shine. Printed faster, silk starts to look matte. Glitter and sparkle colours need a nozzle of at least 0.4 mm.

The colours run side by side along the strand. Which colour lands on each face of your print depends on which way the nozzle is moving. To change which colour faces front, rotate the model on the plate in Bambu Studio. To stop colours swapping halfway through a print:

• Feed from the A1 mini’s own spool holder if you can. A long path through the AMS lite makes the strand more likely to twist.
• Set inner and outer wall speeds within 20% of each other. Identical is best.
• Keep speeds similar across walls, infill and top layers.
• Don’t raise retraction above 1–3 mm.

PLA can print steep overhangs on its own, because the A1 mini’s cooling fan sets each layer quickly. Keep the fan at 100%. Bambu Studio measures overhang angles from the plate, so 90° means a straight wall that needs no support. For supports that come off easily:

• Use tree supports.
• Set the top gap (Z distance) to 0.2 mm for 0.2 mm layers.
• Set the interface to 50–75%. The interface is the dense layer where the support touches your model.

If you have an AMS lite, you can print just that interface layer in PolySupport™ for PLA. It snaps away cleanly.

Every Polymaker spool is dried and vacuum-sealed before shipping. You don’t need to dry a new one. The A1 mini’s spool sits out in the open, so between prints put the spool back in a resealable bag with the desiccant pack, or use a PolyDryer. If the spool pops or hisses while printing, it has picked up moisture. Dry it at 55°C for 6 hours.

Check these in order:

1. First layer. If the nozzle starts too close to the plate, the filament has nowhere to go. Make sure the plate is clean and fully seated so auto-levelling reads it correctly.
2. Temperature. Stay within 190–230°C. Too cold, and the filament won’t flow.
3. Speed. Very fast prints can outrun how fast the nozzle melts filament. Lower the speed from the printer screen and see if flow comes back.
4. Moisture. If you hear popping, dry the spool.

If you hear clicking from the extruder and still get nothing, see “The nozzle is blocked”.

Fine hairs across the print usually mean the filament is wet. The water turns to steam in the nozzle and makes it ooze. Dry the spool at 55°C for 6 hours. If it still strings, lower the nozzle temperature by 5–10°C, staying within 190–230°C. Then check retraction is set to 1–3 mm.

PLA rarely warps, so the cause is usually the plate:

• Clean it. Wipe the textured PEI plate with isopropyl alcohol about every 5 prints. Finger grease stops prints from sticking. Never use acetone.
• Bed temperature. Set it to 55–60°C. The A1 mini’s bed reaches 80°C, so this is well within range.
• First layer. Print it at 30–45 mm/s with the fan off.
• Large or dense parts. Add a brim of 10–30 lines. A brim is a thin ring of extra lines around the base that holds the corners down. Add glue only if needed.
• Drafts. The A1 mini is open, so keep it away from cold air.

• Temperature. Raise it 5–10°C, staying within 190–230°C.
• Speed. Slow down. Each spool has a limit on how much plastic it can melt per second:
  • Panchroma™ PLA: 28 mm³/s
  • Dual Matte: 24 mm³/s
  • Dual Silk: 20 mm³/s
• Using the Polymaker preset keeps you inside these limits.
• Moisture. Wet filament weakens how layers bond, so dry the spool if it pops.

Do a cold pull. It drags out burnt bits stuck inside the nozzle.

1. Heat the nozzle to printing temperature and push a little filament through.
2. Let it cool to about 90–140°C.
3. Pull the filament out firmly in one move.
4. Check the tip. If it’s dirty, repeat.

If flow still doesn’t come back, swap the hotend. To prevent blocks, don’t leave filament sitting in a hot nozzle when you’re not printing. Also, Panchroma™ Matte is slightly abrasive and the A1 mini’s stock nozzle isn’t hardened. If you print a lot of matte, a hardened nozzle will last longer.