stumped / noob

[Michael Rule]

well... I can't get my extruder to work. Most recently I rebuilt the
heated parts of the extruder and temperature control looks stable and
accurate. However, I was unable to perform a test extrusion at 220C.
It seems like the system jammed, then the filament stripped, or maybe
the filament just stripped. I just tried assembling the Mk5 Idler
pulley for the extruder and it doesn't seem like this wheel even fits
with the MK4 extruder gear.

lets assume for a moment that the motor portion of the extruder is not
the problem. Assume that the test extrusion failed because it was too
cold, and there is a slight mis-calibration in the temperature. How
much warmer can I get, using the default 100K 3mm thermistor with
beta=4066. Is it reasonable to assume that cold plastic is causing the
extruder jam ?

sig--mrule

[Michael Rule]

oh, ok, definitely need the Mk5 gear with the Mk5 pulley. I .. did not
know this.

[MakerBot Space2]

Hi,

I have always gotten extrusions to work at 220 - I have not gotten
good builds until I cranked my heat up to 229 - 240. I bulged and
destroyed a PTFE barrier @ 235 - I have a copper sleeve and have gone
as far as 300 by accident but the system is working fine and I'm
getting prints in the 240 range with fewer extrusion stops. I would
add a copper 1/2 inch coupler sleeve first before going over 235.
With the extrusions you have tried - when you back the filament all
the way out what does the end look like?

Thanks

Brandon

[Ivan Locke]

Is there an Mk5 idler? I am using my Mk5 gear with the old Mk4 acrylic idler glued to the bearing.

Ivan

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[peterr]

hello michael,
A rather simple way to test if your nozzle is hot enough, is by
pushing the filament through by hand...
You should have some extrusion when you push it down...

with the motor:
Set 255 in the RepG control panel, and feed the filament down the
extruder...
Take note of the teeth marks on the filament for the right idler wheel
settings...
not sure how they supposed to look on MK5 driver gear pulley as i
don't have that one...

Try holding the filament and pull back to see how much strength it
requires to 'strip'...
with the MK5 pulley it should need considerable force to make the
filament strip...

From my experience, once the filament stripped - i have to clean out
the pulley teeth...