laird.p
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Re: MK3 and flexible filament ?

Jan 25, 2018 4:40 am

I have printed NinjaFlex, but I had to slow way down - 10 mm/s! 20 mm/s generated back-pressure, followed by the filament coming out the side of the extruder. The issue isn't the BondTech gears - they are great - I think it's that the filament path isn't fully constrained around the gears. Well, and of course, that NinjaFlex is absurdly soft.

devdoc
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Re: MK3 and flexible filament ?

Jan 25, 2018 5:30 am

laird.p wrote:
Jan 25, 2018 4:40 am
I have printed NinjaFlex, but I had to slow way down - 10 mm/s! 20 mm/s generated back-pressure, followed by the filament coming out the side of the extruder. The issue isn't the BondTech gears - they are great - I think it's that the filament path isn't fully constrained around the gears. Well, and of course, that NinjaFlex is absurdly soft.
Gotta be something that can be done. Perhaps a better formed PTFE tube up to the gears. Will try something softer tomorrow. My print came out great, albeit a little string. Changed k to 15 and disabled retraction. So far half way done and it looks clean as can be. So perhaps their is hope. I am happy so far for my first two attempts, and in all fairness I was no expert on FF before.

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Area51
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Re: MK3 and flexible filament ?

Jan 25, 2018 5:41 am

Firmware RC5 (150b) has LA disabled to improve Octoprint stability (experiment), but RC4 (143) still has LA.
Just got a spool of NinjaFlex I want to try in the near feature. Looking forward to hear about your result and recommendations :D

scott.w12
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Re: MK3 and flexible filament ?

Jan 25, 2018 6:36 am

I had great luck with eSun eFlex TPU (Shore A 87). I just sliced it with Prusa Control and the Flex material setting. Looking at the gcode it is printing at about 25mm/s. However I was able to turn the speed up to about 125% on the machine. Anything faster and it would jam the extruder. There was some stringing, but not too bad. Much better than my previous experience with this same roll on a Maker Select. The MK3 did seem to respond positively to me loosening the pressure on the Bondtech gears.

devdoc
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Re: MK3 and flexible filament ?

Jan 25, 2018 1:19 pm

I must just be lucky. I printed two octopi with SS TPU 98a without issue. The second one is shown here cleaned up a bit by using 15 as a K factor. Worked great. Just a little glue stick as a base. Hope they can help you figure out what is going on, but mine is working well with exception to the manual load/unload (not a big deal). Good luck! I am also using the default TPU settings with the acceleration set to 1000, and nothing else. I am still using firmware 143B by the way as linear advance is working for me fine from SD.
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paul.m27
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Re: MK3 and flexible filament ?

Jan 25, 2018 2:44 pm

I printed ninjaflex with no issues. Printed a nice frog just to see if I could.

georg.s2
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Re: MK3 and flexible filament ?

Jan 25, 2018 4:13 pm

paul.m27 wrote:
Jan 25, 2018 2:44 pm
I printed ninjaflex with no issues. Printed a nice frog just to see if I could.
Could you share more about this print?
Which slicer, which settings, any mods, print bed treatment?

Thnx!

matthew.h21
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Re: MK3 and flexible filament ?

Jan 25, 2018 4:40 pm

I tried out Ninjaflex on my MK3 as well, had pretty good luck, I printed very slow 10mm/s and 60mm/s travel as the creator of the part I printed had suggested. Could us a little tweaking still as there was a little stringing, but not bad first print. And the robot hand is a really cool design.

https://www.thingiverse.com/make:431342

devdoc
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Re: MK3 and flexible filament ?

Jan 25, 2018 4:40 pm

georg.s2 wrote:
Jan 25, 2018 4:13 pm
paul.m27 wrote:
Jan 25, 2018 2:44 pm
I printed ninjaflex with no issues. Printed a nice frog just to see if I could.
Could you share more about this print?
Which slicer, which settings, any mods, print bed treatment?

Thnx!
Sure.
Slicer: Slick3r PE 1.86
Bed prepared with light glue stick material for ease of removal.
I am pretty sure that the speed is also limited by the volumetric rate overall, so that may be the key
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Last edited by devdoc on Jan 25, 2018 4:45 pm, edited 2 times in total.

devdoc
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Re: MK3 and flexible filament ?

Jan 25, 2018 4:43 pm

Continued
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