Question about filament shavings

Question about filament shavings

Postby bburnett » 2013-Jul-Mon-08-Jul

I have been printing for for a couple days on my Simple, trying to get it calibrated pretty good and it is working fine but I have been using the included filament and noticed this morning that there were some shavings by the gear and bushing. Is this normal or is this telling me the filament is slipping or too tight in there?
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bburnett
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Question about filament shavings

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Re: Question about filament shavings

Postby Tdeagan » 2013-Jul-Mon-12-Jul

I only see shavings like this after I scrape them out of my hob. It looks like they're falling out of the hob (at least for the most part,) by themselves for you. The shavings may just be the hob biting into the filament. How much of the hob is staying filled with filament (as opposed to discharging them as shavings?)

If you reverse the filament out of the extruder and look at it, does it have an even set of indents/cuts/whatever from the hob, or does it have a semi-circular divot cut out of one side? The divot would indicate bad feed, the indents not so much.
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Tim Deagan
KC5QFG
(optional Dual Extrusion) Printrbot Plus V1 [3/2013]
bed stabilizers, bed levelers, Y & X belt tensioners,
50mm fan mount, LED ring light, Z-axis screw Isolators,
Z-shaft stabilizers,optional Bowden conversion, GT2 belts/pulleys,
M8x1.25 Z Screws, Flex. Z-couplers,
RAMPS 1.4 w/ LCD,
Quick Change Extruders:
Option 1- Dual hybrid geared Wade's/Bowden w/ 3mm & 1.75mm Ubis,
Option 2 - Dual direct geared Wade's w/ 3mm & 1.75mm Ubis
Option 3 - Single geared Wade's w/ 3mm or 1.75mm Ubis
Option 4 - Single belt drive Wade's w/ E3D
MIC-6 metal bed
Thingiverse Profile: http://www.thingiverse.com/tdeagan/designs
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Re: Question about filament shavings

Postby bburnett » 2013-Jul-Mon-14-Jul

I noticed that the marks were not really even; so I tightened the tension on the screw for the filament and the shavings have gone away. I then calibrated my extruder and I extruded 100mm but after my measurement it only extruded 77.52mm. Should it be this far off?

Thanks.
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bburnett
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Re: Question about filament shavings

Postby Tdeagan » 2013-Jul-Mon-15-Jul

Just to make sure we're on the same page, extruder calibration measures the filament going into the extruder, not the actual extruded filament itself.

A delta of that much is certainly possible, I've been that much off before. I tend to measure it it 20mm or 30mm increments but 100 mm should be even more accurate.
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Tim Deagan
KC5QFG
(optional Dual Extrusion) Printrbot Plus V1 [3/2013]
bed stabilizers, bed levelers, Y & X belt tensioners,
50mm fan mount, LED ring light, Z-axis screw Isolators,
Z-shaft stabilizers,optional Bowden conversion, GT2 belts/pulleys,
M8x1.25 Z Screws, Flex. Z-couplers,
RAMPS 1.4 w/ LCD,
Quick Change Extruders:
Option 1- Dual hybrid geared Wade's/Bowden w/ 3mm & 1.75mm Ubis,
Option 2 - Dual direct geared Wade's w/ 3mm & 1.75mm Ubis
Option 3 - Single geared Wade's w/ 3mm or 1.75mm Ubis
Option 4 - Single belt drive Wade's w/ E3D
MIC-6 metal bed
Thingiverse Profile: http://www.thingiverse.com/tdeagan/designs
User avatar
Tdeagan
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Re: Question about filament shavings

Postby bburnett » 2013-Jul-Mon-16-Jul

Yes we are on the same page; I will test adjusting my E value. I did notice that temperature plays a little bit of factor too with this, I have been using 185 degrees with the clear filament.
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bburnett
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