🧰 Anycubic Kobra S1 — Complete Maintenance Guide

⚠️ Safety First

• Always power off and disconnect the printer before cleaning or touching moving parts. (Z-screw lubrication is the one exception — the motor needs to be on to move axes.)
• Let the hotend cool below 40 °C before handling the nozzle or silicone sock.
• Use insulated gloves when cleaning a heated nozzle.
• Work in a well-ventilated area if using isopropyl alcohol or compressed air.

📅 Quick-Reference Schedule

🔗 Original source: Anycubic Wiki — Kobra S1 Maintenance Recommendations

📋 Quick-Check Walkaround (Pre-Print)

• Spring steel sheet is clean and seated flat.
• No debris on the PEI/textured surface.
• Filament spool turns freely; no tangles.
• Nozzle tip is clean (wipe with a brass brush or tissue while hot if needed).
• Z-screw and Y-rods are clean and lightly lubricated.
• Fans spin up correctly on startup.
• Silicone sock is seated and intact.

Z-Axis Lead Screw Every 3 months

Symptoms it needs attention: Grinding, clicking, or uneven noise when the Z-axis moves. (Tip: printing above 350 mm/s produces normal metal friction sounds — don't confuse the two.)

🛠 Step-by-Step

1. 1 Clean the screw. With printer off, wipe the lead screw with a lint-free cloth to remove dust and old grease. A soft brush helps reach the threads.
2. 2 Zero the Z axis. Power on → Tools → Move → All Zero (or Z Zero). The bed rises to the top.
3. 3 Apply grease. Dab a pea-sized amount of PTFE-based grease (e.g. Super Lube 21030) onto a clean cloth. Run it along the exposed screw threads. Avoid lithium grease — it runs off.
4. 4 Spread evenly. Press Z+ to lower the bed to the bottom, then apply grease to the remaining threads. Hit Z Zero to raise again — the nut spreads the grease naturally.
5. 5 Test. Run a short print or move the Z-axis through its full range. Listen for smooth, quiet travel.

Y-Axis Linear Rods Monthly

The Y-axis glides on steel linear rods through linear bearings. Dust or filament fragments can cause binding and layer inconsistencies.

🛠 Step-by-Step

1. 1 Power off & unplug.
2. 2 Inspect. Gently slide the bed by hand. Feel for roughness, catches, or visible debris on the rods. Use a lint-free cloth or soft brush to wipe away dust.
3. 3 Blow clean. If debris is stubborn, use an air gun, blower, or compressed air can — short, gentle bursts to avoid blowing dust into electronics.
4. 4 Lubricate. Apply a thin, even coat of PTFE grease along the rod surface. Slide the bed back and forth by hand to work it in.
5. 5 Test. Reconnect power, home the Y-axis, and run a small print. Listen for smooth, quiet operation.

X-Axis Rods As needed

The X-axis uses graphene-bearing sleeves — they are self-lubricating.

🛠 Cleaning

1. 1 Power off and unplug.
2. 2 Dampen a lint-free cloth with isopropyl alcohol (≥90 %).
3. 3 Wipe the rod thoroughly to remove dust, filament dust, and old residue.
4. 4 Let the alcohol evaporate completely before powering on.

Belts Adjustment As needed

Proper belt tension is critical. Loose belts can cause various printing issues, such as layer lines. You will need H2.0 and H2.5 Allen keys.

🛠 XY-axis Belts

1. 1 Turn off the printer. Disconnect the power supply to ensure safe operation.
2. 2 Loosen tensioners. Use the H2.5 Allen key to turn the screws on the left and right belt tensioners counterclockwise by about two turns. Do not remove the screws.
3. 3 Move the print head. Manually move the print head back and forth and left and right for two full cycles. The internal spring will auto-tension the belt.
4. 4 Tighten tensioners. Push inward on the tensioner screws with the H2.5 key, then tighten both screws clockwise to secure them.

🛠 Z-axis Belt

1. 1 Loosen tensioner. Lay the printer down to expose the bottom. Use the H2.0 Allen key to turn the tensioner screws counterclockwise by about two turns. Do not remove the screws.
2. 2 Move the belt. Pull the Z-axis belt clockwise for half a turn, then pull it back counterclockwise. Repeat this back-and-forth motion three times until the belt moves smoothly.
3. 3 Tighten tensioner. Tighten the bottom tensioner screws and place the printer back upright.

🛠 Calibration

1. 1 Turn on the printer and tap “Calibration” on the display.
2. 2 Perform the input shaping and auto-leveling function (takes about 15–20 minutes).

▶️ Extruder Video Guides

Visual walkthroughs for taking apart the Kobra S1 extruder and tuning tension to fix layer lines or extrusion issues.

Hotend & Nozzle As needed

Signs of trouble: under-extrusion, stringing, blobs, clicking extruder, or poor surface finish.

🛠 Basic Cleaning (surface gunk)

1. 1 Remove the silicone sock (carefully — it's brittle when cold).
2. 2 Heat nozzle to 200 °C.
3. 3 Wearing insulated gloves, use a paper towel or tweezers to wipe the outside of the nozzle clean.

🛠 Deep Clean — Cold Pull (recommended for clogs)

1. 1 Heat hotend to printing temperature for your current filament. Purge a small amount.
2. 2 Let it cool to ~90–100 °C (just above the glass-transition temp of PLA).
3. 3 Manually push filament through until it exits the nozzle, then firmly pull it out — the tip should come out as a clean plug with debris inside.
4. 4 Repeat until the plug clean. Use nylon cleaning filament for stubborn clogs (follow the same method).

🛠 Clogged Nozzle — Needle Clear

1. 1 Heat nozzle to 230 °C.
2. 2 Carefully insert the provided steel needle (or 0.35 mm nozzle-clearing pin) up into the nozzle orifice.
3. 3 Purge filament to push out the dislodged debris.

Silicone Sock Inspect regularly

The silicone sock insulates the heater block and prevents filament from sticking to it.

• Check for: cracks, tears, or heavy buildup of burnt plastic.
• Replace if damaged — a torn sock causes temperature instability and stringing.
• Soak a damaged sock in isopropyl alcohol to soften residue, then rinse and dry — but replacement is cheap and recommended.

Cutter (Filament Cutter) Every 3–5 spools

The ACE Pro / filament cutter can dull over time, leading to ragged cuts or failed retractions.

1. 1 Power off.
2. 2 Use an S2.0 hex (Allen) key to remove the cutter assembly.
3. 3 Inspect the blade edge. If it's chipped, rounded, or visibly worn, replace it.
4. 4 Reassemble and test with a filament load/unload cycle.

Spring Steel Sheet (Build Plate) Every print

Oils from your fingertips weaken bed adhesion. A clean sheet is the #1 fix for first-layer problems.

1. 1 Remove the spring steel sheet from the magnetic bed.
2. 2 Wash with warm water + dish soap, then rinse thoroughly. Or wipe with isopropyl alcohol after every print.
3. 3 For stubborn residue (glue stick, PETG adhesion), wash with soap and water — alcohol alone won't dissolve water-soluble glue.
4. 4 Dry completely before re-seating on the bed.

Fans (Hotend, Front Cover & Auxiliary) Weekly check

Dust buildup on fan blades reduces cooling efficiency and can cause noise or vibration.

1. 1 Power off and unplug.
2. 2 Use compressed air, a soft brush, or a cotton swab to dislodge dust from blades.
3. 3 For stubborn grime, dampen a swab with isopropyl alcohol and wipe each blade.
4. 4 If dust is severe (e.g., after many hours in a dusty room), remove the fan housing for a thorough clean.

Camera As needed / weekly check

Blurry or hazy time-lapse / monitoring footage usually means a dirty lens.

1. 1 Use a lint-free microfiber cloth or a cotton swab.
2. 2 Lightly moisten with isopropyl alcohol.
3. 3 Gently wipe the lens in a circular motion. Avoid pressing hard.

🔧 Bonus — General Good Practices

• Keep the enclosure clean. Wipe down interior walls and the glass door monthly — airborne particles land on prints.
• Check belts (if accessible). Pluck the X/Y belts — they should sound like a low guitar note. Too loose → ghosting; too tight → bearing wear.
• Check the PTFE tube. If the Bowden tube (if used) shows scorch marks at the hotend end, trim 5–10 mm or replace it.
• Store filament properly. Dry filament = fewer clogs and better surface finish. Use a dry box for hygroscopic materials (PETG, TPU, Nylon).
• Run a PID tune if you see temperature fluctuations during prints (firmware menu or via G-code).
• Log your maintenance. Jot down what you did and when — it helps diagnose issues later.

🛒 Replacement Parts & Where to Buy

Genuine Anycubic parts plus trusted aftermarket sources. Links verified June 2026.

📍 Anycubic Official Store

All Kobra S1 accessories: store.anycubic.com/collections/accessories-for-kobra-s1-combo

📍 Amazon (third-party & bundles)

📍 Micro-Swiss (aftermarket hotend)

FlowTech™ all-metal hotend, heater core, silicone socks (3-pack): store.micro-swiss.com/collections/anycubic-kobra-s1

📍 3DJake (Europe / UK)

Spare parts for Kobra S1: 3djake.com

📘 Replacement guides (Anycubic Wiki)

• Cutter replacement guide
• Hotend replacement guide