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Stringy prints

Posted by carmojos

carmojos

Stringy prints
March 22, 2014 06:00PM

Registered: 13 years ago
Posts: 38

When I print multiple object the travel areas get traces left behind. I have retract set to 2mm at a speed of 1000 and z lift set to 1mm. It looks to me like nothing is retracting.

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cat.farmer

Re: Stringy prints
March 22, 2014 08:13PM

Registered: 12 years ago
Posts: 466

Try slower speeds, less heat, more retraction or any combination of those.

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carmojos

Re: Stringy prints
March 23, 2014 12:43PM

Registered: 13 years ago
Posts: 38

I have my non printing travel speeds at 60mm already. I reduced temp to 185, and set retraction to 5mm. Still happening. Visually the extruder wheel is not reversing when making non printing moves. I can manually do a reversal in repetier so I know the mechanics are working correctly.

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Dirty Steve

Re: Stringy prints
March 23, 2014 03:46PM

Registered: 13 years ago
Posts: 560

you don't need any more z lift than double your printing layer height. Unless you are using a Bowen type extruder setup, your retraction should be about 1mm when your extrusion multiplier is correct.

At a 5mm retract you are oozing filament, as the print nozzle remains in one place too long due to the time it takes to retract 5mm.

Edited 1 time(s). Last edit at 03/23/2014 03:47PM by Dirty Steve.

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carmojos

Re: Stringy prints
March 23, 2014 05:23PM

Registered: 13 years ago
Posts: 38

I am concerned that the gears are not turning when retraction is supposed to be happening. No matter what the settings are.

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Dirty Steve

Re: Stringy prints
March 23, 2014 06:10PM

Registered: 13 years ago
Posts: 560

what slicer are you using? What are all your retraction settings?

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carmojos

Re: Stringy prints
March 23, 2014 06:43PM

Registered: 13 years ago
Posts: 38

Slic3r. I started today with 7mm retraction at a speed of 1000mm/s. Now I am at 1mm with a speed of 30mm/s. Z lift of 1 mm.

Extra length on restart .5
Minimum travel after retraction 2
Retract on layer change is checked

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Dirty Steve

Re: Stringy prints
March 23, 2014 06:55PM

Registered: 13 years ago
Posts: 560

Set Extra length on restart to 0. Drop Z lift to double your layer height, under Printer Settings>General>Advanced make sure Use firmware retraction is unchecked.

1000mm/s is an undo-able retraction speed. Try dropping it to 10mm/s.

When it is suppose to do a retraction, does the extruder motor make any odd noises like it's dropping steps?