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## What does flow rate mean in 3D printing?

3D printer flow rate, or the extrusion multiplier, refers to the slicer setting that determines the amount of plastic to extrude. By default, the flow rate is set to 1.0 or 100% depending on the slicer. When you set the flow rate to 1.1 or 110% you are increasing the flow rate by 10%.

## How do you find optimal speed?

The optimal speed can be calculated by setting the derivative of the total cost with respect to speed equal to zero as shown in Eq. (2). It can also obtained by drawing the graph of total cost versus speed.

**How is the auto speed calculated in Slic3r?**

According to the tooltip in Slic3r, auto speed is calculated from two parameters: Maximum speed speaks for itself, but how can I calculate the maximum volumetric speed of my print? Auto speed is calculated from maximum volumetric speed in mm 3 per second.

**What is the volumetric speed of 80 mm?**

If you normally print at 80 mm/s, your extrusion width is 0.5 mm and you are printing 0.2mm high layers, your volumetric speed would be 80 * 0.5 * 0.2 = 8 mm 3 /s, which is the volume of plastic extruded by your printer every second when printing at that speed (not accounting for any die swell).

### What’s the Max volumetric speed of a Prusa i3?

The E3D V6 hotend that ships with the Original Prusa i3 MK3/S is advertised with a rate of 15 mm 3 /s. A safe value that leaves some space for imperfect setup (idler tension, slightly jammed nozzle) of 11.5 mm 3 /s is realistic. If you need to push more filament, a more powerful hotend will be necessary.

### What happens when you set Max volumetric speed?

“Obeying the speed limit” with the max volumetric speed setting avoids extruder clicks and jams that can spell disaster mid-way through a large print. Different filament materials have different characteristics. Viscocity, stiffness and other factors may greatly reduce effective throughput.