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What I Learned Building A 100W CO2 Laser Cutter
2026-07-10 | By Zach Hipps
Introduction
A few weeks ago, my phone rang. It was my nephew who was diving headfirst into building a CNC plasma table from scratch. He had hit a wall right out of the gate because the electronics would not talk to his software. Nothing was moving, and he did not know what to try next. Over the course of a week, we spent hours going back and forth, combing through wires, tracing signals, and trying to figure out why this machine was refusing to come to life. It made me realize something important. I only had the answers to help him because a few years ago, I was the one staring at a pile of parts, completely lost and questioning every choice that led me there.
That pile of parts eventually became my 100-watt CO2 laser cutter, built totally from scratch. I did not build it because I could not buy one. I just had very specific requirements. I wanted a CO2 laser in the 100-watt range and a work area of at least 24 by 36 inches. At the time, a commercial machine with those specs would have set me back ten to fifteen thousand dollars, which was completely out of the cards. Building this machine myself gave me the exact specs I wanted for a fraction of the cost.
Part 1: The Bucket List Project
Before we get into the guts of it, let us be clear about the buy-versus-build decision. If you are looking to start a business and need a machine that works on day one to fulfill orders, do not do what I did. Buy a turnkey machine. But if you enjoy the process of building and learning as much as the process of making, then this is the ultimate project. My goal was not to have a perfect tool... It was to have a project that taught me more about lasers. Honestly, my laser is not perfect, but I know the guy who built it. If I want to improve something tomorrow, then I know exactly where to find him. When I first test-fired this giant glass tube into a piece of three-quarter-inch plywood without even a focusing lens, it burned a massive hole instantly. It was terrifying, but it proved the power was real and got me excited to continue.
Part 2: Designing for Progress
I started the design in Autodesk Fusion, but I made a conscious choice not to over-design. I have seen people spend years in CAD obsessing over every single nut and bolt, and they never actually cut their first piece of aluminum extrusion. I did not want perfection to get in the way of progress. I used a parametric design for the frame, which gave me a safety net. I knew the general dimensions I wanted, but I didn’t solve every mounting bracket or sensor placement on day one. I chose aluminum extrusion because it is forgiving and lets me treat the build as an evolving prototype. I designed and 3D-printed adjustable mounting brackets for the laser tube that slide right into the T-slots, with small holes in the brackets for cable ties to hold down the tube. The final frame ended up being 1500 millimeters wide, 1000 millimeters deep, and 250 millimeters tall, so I should be able to fit just about anything in this laser.
Part 3: “Future Zach” and the Efficiency Myth
This build-as-you-go strategy meant I became very well acquainted with someone I call “Future Zach.” Whenever I hit a problem that felt too complex for the current stage of the build, like how to route air-assist lines or where to tuck motor drivers, I would just say that it was a problem for Future Zach. Was this the most efficient way to build a machine? Absolutely not. I had to take things apart more than once and slide T-nuts into channels I had already capped off. At one point, I forgot to put the laser head on the Y-axis before screwing on both end plates, so I had to take it apart and redo it. If I had waited until I had every answer, I'd still be staring at a blank screen. Assigning those unknowns to Future Zach kept the momentum going. When Future Zack eventually inherited those problems, he didn't panic. I just hopped into DigiKey, ordered the exact right terminal blocks, connectors, or cable management clips, and just kept moving forward. I didn't mind that the route wasn’t a straight line. Trying to be perfectly efficient is an impossible expectation, and the detours are usually where the actual learning happens.
Part 4: Prototyping in Plastic
One of the best tools I had during the build was my 3D printer. Every major plate on this machine started as a 3D print because it was a fast, cheap, and easy way to confirm my geometry. Once the design had settled, meaning I had used the machine and confirmed the motor mounts would not flex or fail, I upgraded the high-stress areas to metal plates. Using 3D printing as a bridge allowed me to test the machine in the real world before I committed to expensive materials. It is a great way to fail fast without breaking the budget.
Part 5: When Things Go Wrong
You also have to expect things to go wrong, and they always seem to happen late at night when you are inches away from a milestone. I bought an expensive, professional water chiller, assuming it would be the easy part of the build, but I couldn't get it to communicate with my controller. After reading the manual, I ended up opening up the five-hundred-dollar piece of equipment at midnight, only to find out the flow sensor relay was literally soldered to the wrong pins from the factory. If I had bought a turnkey laser, I would have been calling tech support and waiting weeks for a replacement. Because I was already in the project mindset, I just grabbed my soldering iron and fixed it. That is the beauty of building it yourself. You aren’t intimidated by the machine because you have already seen it in pieces. You know that any broken component is just a quick search and an overnight shipment away from being resolved.
That brings us right back to my nephew. When he called me up, completely stuck on his plasma table, he was facing that exact same wall. Because I had spent those late nights troubleshooting my own wiring disasters, I knew exactly what to look for. We hopped on the phone, walked through the pinouts step by step, verified the signals, and hit the switch. And it worked! The first stepper motor spun to life right on his bench. It was incredibly rewarding to pass that knowledge down and hear his excitement, but I only had those answers to give because I had blundered my way through my own mistakes. The frustration you go through on your own workbench eventually becomes the blueprint you use to help the next generation with theirs.
Part 6: A Project vs a Tool
To take my laser project across the finish line, I enclosed the machine using aluminum composite material. This material has a high-density plastic core sandwiched between thin layers of aluminum sheet, making it the perfect thickness to slide directly into the slots of the aluminum extrusions. My laser cutter is not the prettiest one out there. The wiring in the back is a little longer than it needs to be, and there are a few extra holes in the extrusion from my early mistakes, but it works incredibly well. I did not build this just because I needed a tool; I built it because I wanted a machine that I could modify, break, and fix without fear. If you want a tool that earns you money on day one, buy one, but if you want a project that teaches you about motion control, optics, electronics, and you don't mind a few late nights troubleshooting, then build it.
If you have a bucket list project you have been putting off, stop waiting for the perfect time. Get started on it today, even if that means just opening up a CAD file or going onto DigiKey to order your first stepper motors and microcontrollers to prototype on your bench. You will be surprised by the burst of motivation that follows as soon as that project moves out of your head and onto your workbench.
