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Subject: Re: Mass flow metreing of fillament?
From: ESN <bonden...@gmail.com>
To: thingiverse <thingiverse@googlegroups.com>
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I agree. consistent fillament is best but a acurate mass flow metering
would reduce costs for fillament and thou make ability to extend print
quality. (and in some ways maybe make concistent fillament more
expensive?)

On 8 Apr, 23:18, Whosawhatsis <whosawhat...@gmail.com> wrote:
> Some ideas in this area have been thrown around, but nothing has really b=
een done about them. The most concrete idea was to mark the surface of an i=
dler bearing OR attach a (printable) encoder ring so that its motion could =
be read by an optical encoder. This would provide feedback to tell you if y=
our filament is slipping (or gone), and would be fairly straightforward to =
implement, but of questionable utility as the extruder should be designed t=
o prevent this from happening at all.
>
> I think someone has also thrown out the of possibility (and if they haven=
't, I have now) of using some kind of force sensor/load cell or something o=
n the idler block's tensioner to measure variations in filament diameter, t=
hough that wouldn't help with non-circular filament, and making sure that t=
he feedstock is consistently round and as a consistent diameter will always=
 be a better solution anyway.
>
>
>
>
>
>
>
> On Sunday, April 8, 2012 at 2:09 PM, ESN wrote:
> > I do not have any idea if this is possible or if any one have thought /
> > tested. And im quite certain that it wouldn't bee cheap.
> > But! my idea: putting a sensor that (touchless)measures the cut area
> > of fillament then virtualy conect it to a pulse number ( known control
> > principle) and by this correct calculate feedrate by real available
> > feed volume in heatzone.
>
> > this would eliminate problems with unconsistant fillament.
>
> > Wich type of sensor? Ultra sonic? image treatment? or radiation type?
> > (radiation is used sometimes in farmers treshers for yeld metering, it
> > calculate mass flow by notice less received radiation from source)
>
> > How does this sound?
> > (I'm from Sweeden and not shure i explained my idea too be clear)
>
> > --
> > Go visit thingiverse athttp://thingiverse.comand stay tuned to the blog=
 athttp://blog.thingiverse.com.
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