The Desk-Side 3D Printing Revolution: Why I Built My Own Monitor
There’s something oddly anxiety-inducing about 3D printing. You hit ‘print,’ walk away, and then spend the next few hours second-guessing whether your creation is actually materializing or if your printer has decided to turn your filament into a modern art piece. If you’ve ever owned a Bambu Lab printer, you know exactly what I’m talking about. Sure, there are apps and web interfaces, but they’re clunky. You shouldn’t have to pull out your phone every five minutes to check if your print is still alive.
That’s why I built my own monitor—a $15 ESP32 display that sits on my desk, quietly keeping tabs on my Bambu Lab P2S. It’s not just about convenience; it’s about peace of mind. What makes this particularly fascinating is how it blends affordability, customization, and the sheer joy of tinkering into something genuinely useful.
The Heart of the Project: The Cheap Yellow Display
Let’s start with the star of the show: the ESP32 Cheap Yellow Display (CYD). Personally, I think this little board is criminally underrated. For $10–$20, you get a 2.8-inch TFT display, a resistive touchscreen, and an ESP32 microcontroller. It’s not the flashiest hardware, but it’s more than enough for displaying print progress, temperatures, and fan speeds.
What many people don’t realize is that the CYD’s lack of PSRAM is both a limitation and a challenge. With only 520KB of SRAM, you’re not going to render complex graphics or stream video. But here’s the thing: you don’t need to. For a status monitor, it’s perfect. In my opinion, the constraints force you to focus on what really matters—clear, readable data.
One thing that immediately stands out is how the CYD punches above its weight. It’s not just a display; it’s a gateway to the ESP32 ecosystem, which is a playground for makers. The fact that you can build something so functional for such a low cost is a testament to how far DIY tech has come.
Home Assistant: The Unsung Hero
Now, let’s talk about Home Assistant. If the CYD is the face of my monitor, Home Assistant is the brain. The Bambu Lab HACS integration pulls in a ton of data—print status, temperatures, fan speeds, you name it—and Home Assistant ties it all together.
From my perspective, this is where the project gets interesting. Home Assistant isn’t just a middleman; it’s a platform that lets you integrate your printer into your entire smart home setup. For example, I can use printer data to trigger automations, like sending me a notification when a print is finished or dimming the lights in my office during long prints.
What this really suggests is that 3D printing doesn’t have to exist in a vacuum. It can be part of a larger, interconnected system. If you take a step back and think about it, this is the future of hobbyist tech—everything working together seamlessly.
LVGL: Making It Look Good
Here’s where things get a little nerdy. ESPHome’s LVGL support is what makes my monitor look like a professional device, not a DIY hack. LVGL’s widgets—progress bars, styled containers, anti-aliased fonts—give the interface a polished feel.
But let me be honest: LVGL has a steep learning curve. The documentation is still catching up, and the YAML configuration can get messy. My config file is over 800 lines long, and most of it is UI layout. That said, once you get the hang of it, it’s incredibly rewarding.
A detail that I find especially interesting is how LVGL forces you to think like a designer. You’re not just dumping data onto a screen; you’re crafting an experience. The rounded corners, color-coded temperature sections, and progress arcs aren’t just aesthetics—they make the information easier to digest.
Why This Matters (Beyond My Desk)
This project isn’t just about monitoring a 3D printer. It’s about the broader trend of customization in tech. We’re moving away from one-size-fits-all solutions and toward tools that let us build exactly what we need.
For instance, the CYD isn’t limited to 3D printing. You could use it to monitor weather data, smart home devices, or even your cryptocurrency portfolio. The ESP32 ecosystem is incredibly versatile, and that’s what makes it so exciting.
What this really suggests is that the future of tech isn’t just about buying the latest gadget—it’s about creating tools that fit our unique needs. In a world where everything is mass-produced, there’s something deeply satisfying about building something from scratch.
Final Thoughts: The Joy of Tinkering
I’ve been using my monitor for a few weeks now, and it’s become an indispensable part of my workflow. It’s not just about the functionality; it’s about the process. Building this project reminded me why I got into making in the first place—the thrill of solving problems, the satisfaction of seeing something come to life, and the knowledge that I’m not just a consumer, but a creator.
If you’re on the fence about starting a project like this, I’d say go for it. The barrier to entry is lower than you think, and the payoff is huge. Whether you’re a 3D printing enthusiast or just someone who loves tinkering, there’s something here for you.
And if you’re not into building it yourself, that’s okay too. The beauty of the maker community is that we share our work. My GitHub repository has everything you need to replicate this project, and there are plenty of alternatives out there, like CYD-Klipper, if you want something simpler.
In the end, this project is a reminder that tech doesn’t have to be complicated or expensive to be useful. Sometimes, all you need is a $15 board, a little creativity, and the willingness to dive in.
