CO2 Laser Maintenance: Every Product We Use in Our Commercial Workshop

Every lens, mirror, lubricant and cleaning product on this page is something we actually use in our commercial workshop in Buckley, North Wales, where two OMTech 80W lasers run 5 to 10 hours a day, five days a week. These are not sponsored recommendations — they're the things we buy repeatedly because they work.

New to laser engraving and want the basics first? Start with what laser engraving is and how it works, then come back here for the maintenance routine that keeps it running.

The weekly and monthly maintenance routine behind our machines' reliability costs about an hour a month and around £50 a year in consumables. Here's exactly what goes into it.

The focus lens

The lens sits above the cutting head and focuses the laser beam to the fine point that does the actual cutting and engraving. A dirty or damaged lens is one of the most common causes of poor cut quality, and one of the most overlooked.

We use the MCWlaser CVD ZnSe 18mm focus lens with a 50.8mm focal length. It fits both our OMTech machines, handles 40W–200W CO2 lasers and the quality has been consistently good. ZnSe (zinc selenide) is the correct material for CO2 laser lenses — don't be tempted by glass lenses, which absorb CO2 laser wavelengths and degrade rapidly.

Check your focal length before ordering — 2 inch (50.8mm) is standard for most desktop CO2 lasers but confirm it against your machine's spec.

The mirrors

A CO2 laser uses three mirrors to direct the beam from the tube to the lens. All three need to be clean and correctly aligned — a dirty mirror absorbs energy that should be cutting your material, and a misaligned one sends the beam off-centre.

We use MCWlaser 25mm gold-plated silicon CO2 laser mirrors, which come in a pack of three — one for each mirror position. Keep a spare set in the drawer — if you damage one during cleaning you don't want to be waiting for delivery with a machine down.

Cleaning fluid

Lenses and mirrors should be cleaned with isopropanol (isopropyl alcohol) — nothing else. It evaporates cleanly without leaving residue, which is exactly what you need on an optical surface.

We use this isopropanol. Buy it in a reasonable quantity — you'll use it every week and it keeps indefinitely.

Never use household glass cleaner, acetone or anything with additives. Never touch optical surfaces with bare fingers — skin oils contaminate the coating.

Lens cleaning tissue

Optical surfaces need optical-grade tissue — not kitchen roll, not microfibre cloths, not anything abrasive. The wrong material scratches the coating and a scratched lens is scrap.

We use these lens cleaning tissue papers — 700 sheets, designed for microscopes and precision optics. A few sheets per clean, one clean per week. At 700 sheets a pack they last a long time.

The correct technique: put a few drops of isopropanol on the tissue, then wipe the lens surface in a single gentle circular motion. Don't scrub. Don't reuse the tissue. If there's significant residue, repeat with a fresh sheet rather than pressing harder.

Rail lubricant

The gantry rails need regular cleaning and lubrication. We use Lucas Oil White Lithium Grease. White lithium adheres well, doesn't fling off at speed, handles the temperature range of a workshop environment and doesn't attract debris the way heavier greases do. Apply sparingly to clean rails once a month.

Air assist upgrade

The built-in air pump on an OMTech does the job, but upgrading it is one of the most impactful and least talked-about improvements you can make. Better air assist means cleaner cuts, less charring, and a lens that stays cleaner between weekly cleans.

We run the Hailea Enviro ET-120 Silent Air Pump on both machines — essentially a koi pond aerator, but significantly more powerful than the standard pump. The swap is a ten-minute job: unplug the air hose and electrical connection from the built-in pump and attach the Hailea's air hose in its place. You'll need a reducer to match the hose diameter to your machine's fitting.

Why a pond pump rather than a compressor? A compressor introduces moisture into the air line, which can contaminate the lens. You'd need a water trap to deal with it, adding complexity and cost. The Hailea runs all day, every day, quietly and completely dry. No moisture, no noise, no trap required. It's a better solution.

Distilled water for the chiller

Not an Amazon link — but essential. Your chiller must run on distilled or deionised water only. Tap water deposits minerals inside the laser tube over time, restricts flow and raises temperature. Available cheaply from most supermarkets. Refill when the level drops and do a full change once a year.

For everything about choosing the right chiller, read our laser chiller guide.

The full maintenance schedule

• Weekly: clean the focus lens and all three mirrors with isopropanol and optical tissue
• Monthly: wipe down and re-grease the rails with white lithium grease; check and top up chiller coolant
• Ongoing: run air assist on every job; check chiller temperature before starting; never leave the machine unattended while cutting

For the full reliability data behind this routine, read the OMTech reliability post. And when tubes and power supplies eventually need replacing, our laser tube guide and power supply guide have you covered.

Want this shown to you in person?

The full maintenance routine is covered in our hands-on training course, bookable in person at our North Wales workshop or by video call. Come and watch the machines running at our showroom in Buckley, and use our OMTech discount code for 4% off when you order your machine.

Disclosure: All product links in this post are Amazon affiliate links — we earn a small commission if you buy. Every product listed is something we purchase and use ourselves in our commercial workshop.