Speed/flow question

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Penged
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Speed/flow question

Post by Penged »

So I have read that it is beneficial to slow down when you print for better results. Does that mean you should lower the flow rate also?
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teoman
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Re: Speed/flow question

Post by teoman »

Nope.

That is automatic.


However because the filament is moving slowly, it gets time to heat up in the nozzle so you could lower the temperature just a little bit if you wanted to.
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RocketMagnet
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Re: Speed/flow question

Post by RocketMagnet »

For some extra explanation into exactly what the speed and flow does see below:

Speed

Changes the speed of all 4 Stepper Motors which are the 3 towers and the feed stepper motors by the same percentage. So you get proportionally more or less plastic based on how fast the printer is going.

Flow
This only changes the speed of the feed stepper motor. So this just increases or decreases the feed of plastic to the nozzle.


The better your printer is set up then based on the objects your printing the faster you can run your machine.
Printing slower means your printer head isn't thrashing about, your also giving your printer a little bit more time to adjust the temperature of the nozzle to allow for gradual variations in filament diameter.
Start slow and work up in speed is the normal, however there are times such are if your printing an object that requires bridging that faster is better while it bridges. Just comes from a bit of experience based on what your printing.
There is a lot more to it than above hence why I was cryptic with "the better your printer is set up" but that's the general gist IMO

Changing the flow, I've only really done this if I've set a print off and set the wrong filament diameter in the software or it's poor quality filament that's suddenly changed in diameter through the reel so you change the flow of plastic to compensate to ensure the same consistent mass flow rate of plastic to the nozzle.
I did once set the power incorrectly in the firmware for the feed stepper motor, this resulted in underfeeding of plastic that before I worked out my error I tried to compensate by changing the flow as it was clearly underfeeding so I increased the flow.

Anyway hope that makes sense..
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