# Calculate maximum 3d-print speed ### The problem

The slowest link in 3D printing is the hot end, which cannot melt enough filament from a speed x. Therefore we have to calculate the maximum flow rate of your hot end based on the maximum melting rate mm³ / s. Once we know this, we can calculate how fast you can print with your 3D printer without having to struggle with extrusion. ### Determine maximum print speed

If we know the maximum flow rate of the hot end, we can use this formula: Recommended maximum speed = maximum flow rate / (layer height * extrusion width) to calculate the maximum printing speed. Let's assume that we have a maximum flow rate of 13.86 mm³ and we want to print with a layer height of 0.2 mm and a layer width of 0.48 mm. Now we can use this calculation 13.86 / (0.2 * 0.48) to calculate the max speed, in this example we can then print at a maximum of 144 mm / s. ### Increase print speed

Sometimes things can't go fast enough and you want to print faster. However, this requires the hotend e.g. To modify E3D-V6 to this hot end there is the extension Volcano or Super Volcano due to the larger melting zone the printing speed can be increased considerably

Layer height: mm

Extrusion width: mm

maximum flow rate: mm³/s

The maximum print speed is: 0 mm/s