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LuckyPants

Extrusion Flowrate Calculator

by LuckyPants Dec 11, 2016
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This looks pretty useful to keep around, but I feel like it's missing out on a variable or two to help with people who choose to modify their printers. Provided the filament itself doesn't slip or grind away, no small consideration itself, wouldn't higher torque values also increase the maximum flow rate since the cause of the limit is the backflow pressure caused by the constriction of the nozzle? That is why people who upgrade their extruder feeders with geared elements talk about reaching higher flowrate values, right? Have I misunderstood that?

I would like to find a way and add to this great spreadsheet a way to experimentally find the max flowrate. I use MadMakerFilaments.com filament, and he suggests 60% infill speed with 160% extrusion width for infill. Trying these settings has exposed some issues with my settings. I had to switch to PID control for the hotend, and up the temperature. Now, my PID controller can't keep up either. I wonder if I could run PID tune while extruding, to help it run better at fast flow rates? Ideas?? Thanks!

Depending on your nozzle style, diameter, and layer height, a +60% extrusion width could be too much for the system to cope with.

Ex: If you have a MK10 extruder or similar with a PTFE liner (as I had before upgrading to all metal) there is a pretty small melt zone - you can push more filament by upping temps, but there is definitely a limit there. If you are trying this with .30mm layers on a .40mm or .60mm nozzle it could just be too much filament for the hotend to melt.

If you are seeing filament grinding at the extruder rollers or voids in the infill it could be that.

Max flowrate is hard to estimate because its dependant on the hotend...ex: you can flow much more through something like an e3d volcano than a MK10.

=SUM(0.417E4) for 1.75 mm filament
=SUM(0.141
E4) for 3mm filament

0.31 layers at 60 mm/s you need to make this many mm/s from your extruder

3.32349725638639
1.12377245359828

those 5 dollar small steppers should have no trouble keeping up to that.

Comments deleted.

useful tool.thank you.

You’re welcome.

Thank you a lot for your impressive job ! I dreamt it you did it !

Your welcome - I hope you find it useful!

For sure it will.