Detailed 3D print analysis and troubleshooting complex layer transitions. 2. UltiMaker Cura
The following tools provide the best balance of visualization, simulation, and ease of use. 1. PrusaSlicer G-Code Viewer
For CNC machinists, NC Viewer is a top-tier browser-based tool that requires no download, though a version is also available as a Visual Studio Marketplace extension. NC Viewer // GCode Viewer and Machine Simulator
It offers over 400 customizable settings and a 3D visualization of exactly what the printer will execute.
It estimates extrusion widths, layer heights, and print times by analyzing the G-code. It also supports color-coded viewing modes for print speed and fan speed.
While primarily a slicer, UltiMaker Cura includes a robust "Preview" mode that allows you to open existing .gcode files to inspect toolpaths.