some ninjaflex feedback slic3r
i started to use ninjaflex.
I first went with the defaults provided by prusa for Flex material.
What i found was problems with layer adhesion.
i went back into slic3r and brought the tempature up 10C and halved all the Speeds from 20mm/s down to 10mm/s
i then ran some tests and applied similar settings from my ABS and nylon Bridge experiments. in that using auto cooling where the fans were disabled helped. turn off the Z hop.
so my settings under auto cool was all fan speeds set to Zero, cooling thresholds enable fan is layer is below :0 slow down if layer print time is below :15-20 , min print speed: 0
so that forces the layers to slow down even more if below 15-20 seconds a layer.
running more tests and the bridging was causing problems. so i enabled fan settings for Bridge and experimented between 0 and 100% i found the best results around 50% bringing the fan up higher caused the bridge to contract/shrink before the next line had a chance to bond. and going below left the flex too hot and it would stick to the nozzle and pull again causing major problems.
so fans off except where bridging was needed at 50% fans. run the Extruder at 240 and slow down the layers even more then defaults for flex.
i got a MUCH better result with these setting changes that is repeatable.
the difference in feel of the material between the defaults and the modified settings is very noticeable as well.
my feeling is the flex actually needs to go down hotter in the 245 - 250 range but i have not played around in those tempature ranges. i made some 20mm x 20mm hollow cubes for testing that came out very nice with just a few small areas where the layer bonds were weak, which is why going a little hotter may help.
another tip: mark your tension screws for the filament feeder kurned knob , so you have a reference point and for flex turn out the screws about 1 turn to reduce the tension on the feeder and prevent the filament from bunching up.
unfortunately flex needs to go down VERY slow.. so something with ABS or PLA could take 3 hours with flex it will be 5 times that at least.
the original tires were about 9-12 hours with the new settings 15 hours per tire.
Hope this helps if you start to play with flex.
“One does not simply use a picture as signature on Prusa forumsâ€
Re: some ninjaflex feedback slic3r
Thanks for your detailed description Daniel.
Unfortunately your attached pictures are not available anymore. I'd love to see them because I was struggling with flexible filament as well and wanted to see if my tweaks lead to similar results like yours (although I have Filaflex instead of ninjaflex).
Design, Print, Repeat
Re: some ninjaflex feedback slic3r
yeah its photobucket going out of business basically i had a flex tire very loosely layered and then later as i increased temp and slowed down even more i got good layering.
filaflex is a higher shore around 95A if i remember so it should go down easier then Ninja which is 85A shore. the higher the number the harder the material. bone is 100D shore.
the biggest thing to watch is adjusting the tension on the feeder so the flex doesn't bunch up around the curled knob in there.
“One does not simply use a picture as signature on Prusa forumsâ€
Re: some ninjaflex feedback slic3r
That's what I found out, too. Printing too cold may lead to massive underextrusion and bad layer bonding.
The only thing that remains is a bit oozing, but I think have to live with this for flexible filament (at least for FilaFlex).
Design, Print, Repeat