9 votes

What is retract speed & length?

Retraction is the reversal of the direction of the filament and is generally used when moving from one non-contiguous point of the print to another, in order to prevent stringing and oozing of the ...
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  • 5,727
7 votes
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Extruder doesn't retract on inner wall lines thereby causing stringing

Cura has a setting called Combing that is enabled by default. This stops the printer from retracting if the travel is contained within the walls. It does this to ...
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7 votes
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Stringing during travel on first layer with Ultimaker Cura

Yes, if you are using the Combing Mode option, please ensure it doesn't do this in the skin, for a leak/string free first layer, it is required to set the ...
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  • 31k
6 votes
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Question about retraction distance and stringing/print quality with PETG

You cannot endlessly increase the retraction distance, doing so leads to different problems as you encountered. As a rule of thumb, the retraction distance should not exceed the length of your nozzle. ...
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5 votes
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Retraction Causing Skipping

Fighting stringing will not work by increasing the temperature of the hotend. There could be 2 possible causes for your problem, the first is that you still have a too high retraction speed, too ...
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  • 31k
5 votes

Monoprice Select Mini V2 retraction/stringing problem

The Monoprice Select Mini V2 uses a Bowden style extrusion system. Bowden extruders compress the filament in the tube where the gap between the filament and inner tube diameter allow for the filament ...
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  • 31k
4 votes
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Ultimaker Cura not always telling extruder to retract when traveling

You probably have the "Combing Mode" option under the "Travel" options enabled for each layer (All). Combing reduces print time by leaving out the retraction, but ...
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  • 31k
3 votes

Under-extrusion halfway into print - Dremel 3D45 -PETG

That's not under extrusion That is the seam, and technically it is over extruding around it. You will find that if you turn the item, you have such a spot on every layer, actually with an inner and ...
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  • 19.5k
3 votes
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How does slipping Bowden tube affect retraction or does it at all?

The slipping does result in lost retraction distance. It does not result in underextrusion, lost material (except possibly via having insufficient retraction after the reduction), or anything like ...
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3 votes

How to unload filament as cleanly as possible using the extruder motor?

There's a bit of a compromise here: Filament cohesion in the nozzle isn't strong enough to remove all residue at higher temperature Extruder motors can't get sufficient grip / don't have sufficient ...
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  • 1,247
3 votes

Stuttering extrusion after layer change

You retraction settings may be too high. Direct drive extruders require less retraction than Bowden style extruders. Typical retraction settings for direct drive are 1.5mm at 50mm/s and for Bowden, ...
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2 votes
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Monoprice Select Mini V2 retraction/stringing problem

What I ended up doing was using the settings from the cat.gcode that came with the printer. It has a retraction of 10 mm specified, which I thought was a bit much, but if it works, it works.
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  • 181
2 votes
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How to remove unwanted filament trails from sharp corners

You can Z-hop what you like, but if it is oozing it is oozing, you will always see the effects of that as it just drops down. Basically you have multiple issues, first the oozing, second the line ...
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2 votes
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Ender 5: Bowden tube shifts in/out of extruder during retractions

If it's just the pressure fitting on the brass coupler that shifts in/out, or the PTFE tube shifting slightly in/out but remaining in the coupler, that shouldn't be a problem unless it's so loose it ...
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2 votes

Handling retraction when using a mixing extruder (2 in 1 out)

I found this post on the S3D Forums that seem to have some interesting information on custom scripting within Simplify3D. While this doesn't seem to SPECIFICALLY address the question you've got, it ...
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  • 876
2 votes
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Prints coming out very stringy

The travel speed of 160 mm/s is a big red flag. PETG is not tolerant of a hot nozzle moving over it at high speeds, especially unretracted (combing). The nozzle will drag material in a stuttering ...
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2 votes

Missing filament at Z seam

Several things to try: Dry your filament. Wet filament can have trouble resuming after retract due to moisture absorbing all the heat and slowing the melt, and can also drastically increase internal ...
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2 votes

Under-extrusion halfway into print - Dremel 3D45 -PETG

"Prime Amount" sounds like "extra prime on unretract", which necessarily deposits a blob of extra material at the location of unretract, including the Z seam. Setting this to zero ...
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2 votes

Stringing between holes

Consider that the string you are seeing is the nozzle wiping across the surface, especially if you are not getting stringing via your test part. As you suggest, it's not unlikely that the layer viewer ...
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2 votes
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Ultimaker Cura is not always retracting in exported G-Code

It's likely that you're hitting Cura's Maximum Retraction Count (retraction_count_max) within the Minimum Extrusion Distance Window (...
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2 votes
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How do I fix mini-blobs on the edge of a part?

What you are seeing is what is called the 'seam'. Since this part cannot be printed in vase mode (where the extrusion is essentially done as a compressed spiral), there is a point where the printing ...
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  • 262
2 votes

Missing filament at Z seam

Posting my own solution here The seams are printing normally now and the solution was simple. The extruder gear was not gripping the filament correctly during retractions and was slipping as a result. ...
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  • 141
1 vote

Inconsistent layer widths and uneven outer walls

I noticed that these problems happen when there are retractions on layers. I don't have problems with round and simple objects without changes on layers or where all layers are identical. Based on ...
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1 vote

Inconsistent layer widths and uneven outer walls

That kind of issues can be related to multiple causes: Heated bed operated in "bang bang" mode (heater on until set temp reached, turned off until set temp minus threshold is reached, and ...
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  • 3,806
1 vote

Filament doesn't retract for some travel movements using PrusaSlicer

Minimum Travel after Retraction is exactly what it says on the tin: if the travel after a retraction would be less than 2 mm, it does not retract. You'll want that ...
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  • 19.5k
1 vote

Titan extruder retraction noise

After several email exchanges with the customer support, I was not able to find an answer. It was stated that it may have been my assembly and/or extruder mount, but I'm strongly against that after so ...
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1 vote

Extusion rate limiting and firmware retract

Sadly this does not work at present. Setting an M203 E3 resulted in 6 mm retractions via G10 taking 2 seconds each vs the ...
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1 vote
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Under extrusion... sometimes

Here's your problem: 1 mm retraction distance -> stringing... If you have stringing, that means that material that was supposed to end up as part of printed lines instead ended up ...
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1 vote
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What's the best way to pull out fillament from an all metal print head

Cold/Luke-Warm pulling can cause damage and wear to the hot end, and should only be used in cases where you suspect there's a jam in the nozzle. Pulling the filament out at a few degrees above its ...
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