Max Volumetric Speed (MVS) limits how much plastic can be melted and delivered each second. It often predicts real print speed better than a headline mm/s value because line width and layer height are included.
How do you recognize it?
- Underextrusion only at high speed
- Surface turns inconsistent at high flow
- Requested wall speed is never reached
Common causes
- Hotend cannot melt the requested flow
- Filament needs more heat or flows less easily
- Nozzle/layer/line width demand exceeds the system
What should you check first?
- Calibrate MVS for the actual filament and nozzle.
- Use flow = line width × layer height × speed.
- Set a slicer limit with practical headroom.