There are a few free alternatives available now for anyone who wants to give them a try. These have made great progress and have been continuously refined.
MZ_Flow_Temp_Processor
A post-processing program that predicts changes in material flow and dynamically adjusts the nozzle temperature to ensure that the filament is always extruded under optimal thermal conditions.
SB53 G‑Code Flow & Temperature Controller
A highly sophisticated post-processor for OrcaSlicer that calculates the average flow rate every second and automatically adjusts the temperature to maintain optimal viscosity.
GCode‑Sentinel - G‑Code Optimizer & Validator
GCode Sentinel is specifically designed to analyze, validate, and optimize G-code - an alternative to Helio Simulation.
GitHub - twixinator/GCode-Sentinel: G-Code validation and optimization tool for 3D printing · GitHub
IceSL‑vrprinter - G‑Code Simulator & Visualizer
If you use Helio Simulation primarily for G-code simulation, IceSL-vrprinter is an excellent open-source alternative.
