1 Topic by driggers (edited by driggers 2016-02-10 14:10:55)

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Topic: calibrated steps/mm and extrusion multiplier... but overextrudes fill

I recently installed e3d on my SD2 and have ironed almost all kinks. 

The latest is that when I do .4 infill, it overextrudes and looks like this: https://www.simplify3d.com/support/prin … ch-plastic

It shouldn't.  I've done 40% infill before and that didn't happen.

I have calibrated steps/mm and set it in firmware.  I have tested a single walled print and set the extrusion multipler (to 0.99, miraculously).

I have entered an average of measurements of the filament diameter.

My e3d tip is .4mm, and my layer height is .3, extrusion width 0.42.  I've read this might be wrong but I can't seem to find a guide to the relationship with the larger tip.

Printing at 230 (e3d's thermistor).

Any thoughts / help?

SD2 Sanguinololu 1.3a atmega1284p, wood platform, lawsy's carriages, braided fishing line, pallet wood overhead spool mount, carboard/magnet enclosure, glass bed, E3D v6, bed levelling knobs, extended z-stop, 25A DC-DC SSR for bed heater, everything fixed to the SD2 frame, marlin firmware with some adjustments and extra failsafes enabled.  I'll never give up on you, little printer that could(n't)!

2 Reply by IanJohnson

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Re: calibrated steps/mm and extrusion multiplier... but overextrudes fill

Is the single wall a single perimeter or a thin wall?  Are you using S3D?  S3D can do odd things if it isn't a single perimeter/no fill  solid cube.

You can also take the approach of printing 100% infill, pull back the flow rate slider, and ease it in until the gaps disappear.  I often find that the flow settings that make a correct extrusion width don't always give correct results for solid fill.  .4 might be getting close enough to solid to use the other approach.

3 Reply by carl_m1968

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Re: calibrated steps/mm and extrusion multiplier... but overextrudes fill

With a .4 nozzle your width should be .48 which is the standard..

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4 Reply by driggers

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Re: calibrated steps/mm and extrusion multiplier... but overextrudes fill

Thanks for your answers!  It seems there were two problems, both between the chair and the printer.

1.  I didn't have my width set to 0.48.

2.  I was squeezing the callipers too hard, and reading .45 instead of .65.

My .4 infill is looking much better now.

SD2 Sanguinololu 1.3a atmega1284p, wood platform, lawsy's carriages, braided fishing line, pallet wood overhead spool mount, carboard/magnet enclosure, glass bed, E3D v6, bed levelling knobs, extended z-stop, 25A DC-DC SSR for bed heater, everything fixed to the SD2 frame, marlin firmware with some adjustments and extra failsafes enabled.  I'll never give up on you, little printer that could(n't)!

5 Reply by heartless

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Re: calibrated steps/mm and extrusion multiplier... but overextrudes fill

the relationship between nozzle size and extrusion width is 120%

nozzle of 0.40 x 120% = 0.48 extrusion width
nozzle of 0.35 x 120% = 0.42 extrusion width
and so on..

SD4 #1 & #2 - Lawsy carriages, E3D v6, Rumba controller board, mirror bed plate, X motor fan, upgraded PSU & Mica bed heater
SD4 #3 - in the works ~ Folgertech FT-5, rev 1
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