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Message from discussion Replicator 2 Extruder skipping
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Joey Nelson  
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 More options Oct 31 2012, 4:16 pm
From: Joey Nelson <j...@joescan.com>
Date: Wed, 31 Oct 2012 13:16:52 -0700 (PDT)
Local: Wed, Oct 31 2012 4:16 pm
Subject: Re: Replicator 2 Extruder skipping
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I re-ran the shark from the SD, and it still prints fine.

So there is something with the settings in the slice from MakerWare.

I don't think the nozzle is to close, when I leveled, the paper was just
barely getting any friction.

The shark printed fine, so I don't think the nozzle is plugged.

The filament is a fresh roll from MakerBot, so I'd hope it was of
sufficient quality.

The shark and my design are both at the default 230 C.  I'm not sure how
accurate the control and readout are.

I'll do some more testing with your advice in mind.

Thanks,

On Wednesday, October 31, 2012 12:44:06 PM UTC-7, Jetguy wrote:

> No, the gears aren't stripping, it's a stepper motor and thus the
> sound you hear is called skipping steps. Basically, the motor has
> magnetic poles that line up. In order to move, there there 2 phases or
> 2 sets of poles that line up offset to the rotor. You change coils to
> move the rotor forward but if the shaft cannot turn, then you here a
> click as the shaft will actually turn backwards to line up with the
> previous set of poles. The "click" is the sound of the motor tryign to
> move forward, not being able to,and actually spinning backwards a tiny
> bit to line up with the previous "step", meanwhile slapping the
> filament up and down.

> In short, your nozzle is restricted for some reason and thus the
> filament can't be pushed into the extruder.
> Known causes:
> Nozzle too close to platform on first layer
> Nozzle obstructed due to burnt plastic in the nozzle too long (leaving
> the head heated but not actively printing)
> Filament diameter inconsistent causing more friction in a fixed pinch
> drive wheel system (see MK8 upgrades on thingiverse)
> Crap filament
> Nozzle not at correct temperature

> On Oct 31, 3:29 pm, Joey Nelson <j...@joescan.com> wrote:
> > The bot was working for the last two days, but not seems to be a bit
> > unhappy.

> > This is with default medium settings, with rafts and supports selected.

> > I don't remember hearing the clicking noise before.

> > I'm thinking the filament pushing gears are slipping.

> > http://youtu.be/O5QbU_-M_j0


 
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