carter.r
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Extruder Tension Help for Printing Flexible Filament

May 17, 2018 9:26 pm

I have the MK3 Assembled Unit and have printed about 4 parts so far with everything as is with the stock gray PLA. Everything came out great.

Now I'm trying to print some 3D Solutech Flexible Filament, prints at 200-220C and is TPE and the filament is very flexible.

I'm printing a gasket for the Spannerhands V4 spool enclosure. Everything prints OK until about the 5-8 layer. I'm not watching the entire time so I'm guessing. It seems to do alright for about 30 minutes then the filament starts coming out the side of the extruder.

I've been using the stock setting in Slic3r Prusa Edition for Flexible filament and only changing the temp to 215C.

It failed the same way both times, but the second time I loosened the extruder tension screws as suggested by Prusa Material Guide. That didn't help. Unless I don't have it loose enough.

Just to mention when I went to loosen the extruder tension screws they already seemed very loose. I can't find anywhere instructions for the MK3 on how to accurately adjust those, nor can I find a guide to figure that out.

Any help would be appreciated.

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joan.t
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Re: Extruder Tension Help for Printing Flexible Filament

May 17, 2018 10:49 pm

Hi Carter,
with no filament in the printer, I screw the tension screws in, until they just touch the springs and leave it at that

when the filament is inserted, it parts the Bondtech gears and increases the tension just right...

the ends of the screws are just about level with the outer surface of the filament trap door, on the right hand side


regards Joan
I try to make suggestions that I believe to be well founded and safe,You should understand the context and ensure you are happy that they are safe before attempting to apply my suggestions,
what you do, is YOUR responsibility.

carter.r
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Re: Extruder Tension Help for Printing Flexible Filament

May 18, 2018 3:41 am

Thanks. I read that when you posted that in another thread. I did that and the flexible filament spilled out still. Any other suggestions? I even cut the speed and set it all to 30mm/s.

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PJR
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Re: Extruder Tension Help for Printing Flexible Filament

May 18, 2018 7:54 am

carter.r wrote:
May 18, 2018 3:41 am
I even cut the speed and set it all to 30mm/s.
Way too fast for a very flexible filament. Richard will probably be along soon to tell you to use 15mm/s ;)

Peter
Please note: I do not have any affiliation with Prusa Research. Any advices given are offered in good faith. It is your responsibility to ensure that by following my advice you do not suffer or cause injury, damage or loss.

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richard.l
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Re: Extruder Tension Help for Printing Flexible Filament

May 18, 2018 2:39 pm

carter.r wrote:
May 18, 2018 3:41 am
I even cut the speed and set it all to 30mm/s.
Peter is correct, that is way too fast. Max should be 20mm/s but I get the best results at 15mm/s.

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ironjoe13
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Re: Extruder Tension Help for Printing Flexible Filament

May 21, 2018 1:28 pm

Listen to Richard, look at what Ninjatek advises for Ninjaflex :

Extruder Temperature: 225°C – 235°C
Platform Temperature: Room temperature – 40°C
Glue and/ or blue painters tape is suggested if not using a heated bed.
Print Speed:
Top and bottom layers: 10-20 mm/ sec (600-1200 mm/ min)
Infill speeds: 15-35 mm/ sec (900-2100 mm/ min)
Layer 2+ use cooling fan if available.

Source: https://ninjatek.com/products/filaments/ninjaflex/

Minus the temp difference, the speeds should be around this range( I run infill at 20mm/s, everything else 15 for flexibles)


carter.r
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Re: Extruder Tension Help for Printing Flexible Filament

May 21, 2018 11:01 pm

I'm using the stock flex filament setting in the Slic3r Prusa Edition, the only thing I changed is the temp and the speed. The stock extrusion multiplies is set at 1.2. Should I leave it like that or change it?

carter.r
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Re: Extruder Tension Help for Printing Flexible Filament

May 22, 2018 1:29 am

OK SUCCESS!!! Thanks everyone.

So I had to slow it down to 15mm/s for everything except travel speeds. As Joan said screw in the extruder screws until you feel tension. This is tough as you can barely feel when it hits the springs. You have to do it with the allen wrench loosely held in your fingers. And i had to change the extrusion multiplier to 1.

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ironjoe13
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Re: Extruder Tension Help for Printing Flexible Filament

May 22, 2018 11:22 am

Awesome! I did forget to mention that you will want the fastest travel speed you are happy with ( I use 170mm/s)

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