If you're just getting started with 3D printing, you've probably come across two important file types: STL and G-code.
Understanding the difference between them is key to mastering your print workflow. In this post, we’ll break it down in simple terms and show you how tools like Maxel help bridge the gap effortlessly.
What Is an STL File?
STL stands for Stereolithography. It's the most common file format for 3D models.
Think of it as a blueprint of your object. It contains the geometry (the shape), but none of the print instructions.
🟢 What it includes:
Surface geometry (triangles)
Dimensions of the object
Shape and structure
🔴 What it doesn't include:
Print speed, temperature, or material settings
Layer heights or toolpath instructions
You can model in CAD, export as STL, and then upload that to a slicer.
What Is G-code?
G-code is the language your 3D printer understands.
It contains exact instructions on:
How fast to move the nozzle
When to extrude material
Layer-by-layer instructions
Heating, cooling, retraction, and more
G-code is what actually runs on your printer’s controller. You can’t print directly from an STL you must convert it to G-code first.
STL → G-code: Where Slicers Come In
This is where slicing software like Maxel, Cura, or PrusaSlicer comes in. The slicer takes your STL and calculates:
Optimal print orientation
Layer height and infill
Material usage and print time
G-code output tailored to your printer
With Maxel, this slicing happens in the cloud, with no downloads or profiles needed.
STL vs G-code: Quick Comparison
Feature | STL File | G-code File |
|---|---|---|
Used for | Model design | Actual printing instructions |
Editable in CAD? | Yes | No |
Required for 3D printing? | Yes | Yes |
Can be sliced? | Yes | No (already sliced) |
Output by slicer? | No | Yes |
Why Maxel Simplifies This Entire Process
Maxel is a browser-based slicer that makes STL-to-G-code conversion fast and beginner-friendly:
Drag and drop your STL
Our AI orients and slices it for printability
You get clean, printer-ready G-code
No downloads, profiles, or slicer setup
Perfect for hobbyists, pros, or print farms looking to save time and avoid setup complexity.
Final Thoughts
In short: STL is your 3D model. G-code is the print plan.
If you're still managing this manually, give Maxel a try. It converts STL files to calibrated G-code in seconds, no slicer experience required.
👉 Try Maxel today and streamline your 3D print workflow from the start.