G-code to STL

From G-code back to a part

G-code isn't a 3D model: it's the list of nozzle moves, layer by layer. It's common to be shared only the G-code, or to lose the STL and be left with just the file you sent to the printer. Here we rebuild the part by following those moves.

Every line where the nozzle lays down plastic becomes a bead as wide as the line and as tall as the layer. Together they form the part as it prints.

Just the shape or everything printed

Just the shape takes the outer walls: it's a light file and enough to view the part, measure it or use it as a base to redesign. It works when the slicer marks line types, as PrusaSlicer, OrcaSlicer, Bambu Studio and Cura do.

Everything printed includes inner walls, infill and top and bottom layers. It's much heavier. Supports, skirt, brim and prime tower are never included.

Good to know

• It's a reconstruction: surfaces come out with the layer steps, like the printed part.
• To print it again, slicing the original model is better if you have it; this STL is for viewing, measuring or redesigning.
• A G-code for a large part, with everything printed, can be too much for the browser: use "Just the shape".

Tips

• If you're only sent the G-code, check in the preview that the part is what you expect before printing it: that way you know it's sliced right.
• With "Just the shape" the STL is small and you can open it in any design program to measure or modify it.
• G-code already includes the position on the bed: the part comes out where it was going to print.
• If the preview says there are no line types, your slicer didn't mark them: everything printed is included.

Frequently asked questions