What Is Volumetric Speed?
Volumetric speed (often written as mm³/s) tells you how much melted filament your printer pushes through the nozzle every second.
It depends on three things:
- Layer height
- Extrusion width
- Print speed
When the volumetric speed is too high, the hotend can’t melt the plastic fast enough. That leads to under-extrusion, weak parts, rough surfaces, or inconsistent layers.
Every filament has a different melting behavior, so each type has its own safe maximum volumetric flow.
Max Volumetric Speed Calculator
How to Use This Calculator
Mode 1: Volumetric Speed
Use this mode to see how much filament your current settings require.
Most filament spools list a max print speed (like 300 or 600 mm/s), but they rarely tell you the volumetric flow required to reach that speed. If your slicer has a lower volumetric limit set, your printer will never hit those speeds; it will automatically slow down.
Just enter your:
- layer height
- extrusion width
- and target speed.
The calculator shows the required mm³/s, so you can set your slicer’s max volumetric flow correctly.
Mode 2: Max Safe Print Speed
If you already know your filament’s maximum volumetric flow (ex: 16 mm³/s), select this mode.
Enter:
- Layer height
- Extrusion width
- Your filament’s volumetric limit
The calculator will tell you the fastest safe print speed your printer can run without under-extrusion.
How to Manually Calculate the Max Volumetric Speed
Formula
Volumetric Speed (mm³/s) = Nozzle Diameter × Layer Height × Print Speed
Example
If you print with:
0.4 mm nozzle
0.2 mm layer height
150 mm/s print speed
Then:
0.4 × 0.2 × 150 = 12 mm³/s
That’s the volumetric speed your printer needs to sustain.
Max Volumetric Speed vs Print Speed
Print speed (mm/s) is how fast the nozzle moves.
Volumetric speed (mm³/s) is how much melted plastic your hotend must push out to keep up with that movement.
Most filament brands only advertise print speed, but this number is meaningless unless the filament and hotend can melt plastic fast enough to match it. That melting capability is the max volumetric speed.
Why this matters
You can set your slicer to 600 mm/s, but if your max volumetric speed is too low, your printer will never reach 600 mm/s.
The slicer will automatically slow the print down to stay within your volumetric flow limit.
If you force higher speeds without enough volumetric flow, you’ll get under-extrusion, weak layers, gaps, and rough surfaces.
In simple terms
Print speed is the “goal.”
Volumetric speed is the “ability.”
Your actual speed is always limited by whichever number is lower.
This is why calculating your true volumetric requirement is so important: you can only print as fast as your filament and hotend can melt plastic.
Volumetric Speed Cheat Sheet
Volumetric Speed Cheat Sheet
All values are in mm³/s. Use the formula Nozzle × Layer Height × Print Speed.
| Layer Height | 100 mm/s | 200 mm/s | 300 mm/s | 600 mm/s |
|---|---|---|---|---|
| 0.12 mm | 4.8 | 9.6 | 14.4 | 28.8 |
| 0.16 mm | 6.4 | 12.8 | 19.2 | 38.4 |
| 0.20 mm | 8.0 | 16.0 | 24.0 | 48.0 |
| 0.24 mm | 9.6 | 19.2 | 28.8 | 57.6 |
| Layer Height | 100 mm/s | 200 mm/s | 300 mm/s | 600 mm/s |
|---|---|---|---|---|
| 0.20 mm | 12.0 | 24.0 | 36.0 | 72.0 |
| 0.28 mm | 16.8 | 33.6 | 50.4 | 100.8 |
| 0.32 mm | 19.2 | 38.4 | 57.6 | 115.2 |
| 0.40 mm | 24.0 | 48.0 | 72.0 | 144.0 |
| Layer Height | 100 mm/s | 200 mm/s | 300 mm/s | 600 mm/s |
|---|---|---|---|---|
| 0.24 mm | 19.2 | 38.4 | 57.6 | 115.2 |
| 0.32 mm | 25.6 | 51.2 | 76.8 | 153.6 |
| 0.40 mm | 32.0 | 64.0 | 96.0 | 192.0 |
| 0.48 mm | 38.4 | 76.8 | 115.2 | 230.4 |
Tip: if a value is higher than your filament's advertised volumetric limit, reduce speed or layer height, or use a larger nozzle.
Still Have Questions?
If you’re unsure about your filament’s limits or need help dialing in high-speed settings, we’re here to help. Reach out to us anytime and we’ll guide you through choosing the right filament and getting the best performance from your printer.
