Free online G-code viewer: layers, filament and time

No file handy?

What this tool does

Layer by layer with a slider, or a single layer on its own to see what the printer does at that point.

Color by line type (walls, infill, supports, bridges), by speed or by height.

A summary of the print: layers and layer height, meters and grams of filament, time and size.

Opens G-code from PrusaSlicer, OrcaSlicer, Bambu Studio and Cura, and Bambu Lab's sliced .gcode.3mf files.

It also draws CNC, laser and plotter jobs, which extrude no filament.

The file is read in your browser: it is not uploaded to any server and there is nothing to install.

How it works

Open the file

Drop a .gcode or a .gcode.3mf, or try the sample. Long files take a few seconds.

Step through the layers

Move the slider to watch the part grow, or isolate one layer to check the infill, the supports or a bridge.

Check the summary

Filament, time and size, and how much of the filament goes into walls, infill and supports.

Frequently asked questions

What is a G-code viewer and what is it for?

G-code is the list of moves a printer follows to make a part. A viewer draws them layer by layer so you can check the job before printing: whether supports are where they are needed, whether the infill is the one you picked, whether the first layer covers the bed well. ilove3d's G-code viewer does it in the browser, without installing the slicer and without uploading the file.

Can I open Bambu Studio files?

Yes. Bambu Studio and OrcaSlicer save a sliced print as .gcode.3mf, which is a ZIP with the G-code inside. The viewer opens it and shows the first plate. A .3mf that was not sliced is a model, not G-code: that one opens in the 3D viewer.

Where do the time and filament come from?

When the slicer left its totals written in the file, those are shown, and they already account for the printer's acceleration. When they are missing, filament is the sum of what every move extrudes, and time is distance over speed, which gives a minimum: the real print takes longer.

Does it work with CNC or laser files?

Yes. If the file extrudes no filament, the viewer draws its working moves (G1, G2 and G3) and leaves out the rapid ones. It understands arcs and both absolute and relative coordinates.

Question of the month

Which printer do you use?