I’ve printed with Fiberon PA-GF, PA-CF, PPA-CF, and it went pretty smoothly. Dried those out and didn’t really run into issues. Had to dry them out again after a good 2 weeks but that’s expected.
I recently had my shop get some Pro Nylon from MH because we wanted to upgrade from ASA and needed something in a good red. I had some bad prints from the beginning, so I made double sure it was dry and finally had a few decent prints. It had a small amount of warping on the bottom but some extra glue and maybe a brim would fix that. Next print completely failed. See pictures below for the comparison. I’m currently drying the Nylon again in hopes that’s what it is.
The Nylon is sitting in a PolyDryer box with a lot of decadent, and I’ll be borrowing the PolyDryer base from a friend to see if that helps.
Has anyone else here printed with the MH Pro Nylon? What is your experience? Do you think my issues are caused by a wet filament?
But it’s got to be really dry. Like, however long you’d plan to dry it, double the time.
You should run a temp tower.
How was this part positioned on the build plate?
This part was printed with MH PA Pro red and blue. Not the best example, but the only one I could actually find without exhaustive searching through bazillions of pictures of stuff I’ve made…
Thanks for the tips. I’m still experimenting and slowing down the print seems to help, but not fix this. Looking at the layer time I think it’s going too slow at a certain layer and I don’t know how to fix this. Could you take a look at my settings shown?
I would not go faster than 250 anywhere.
I’d cut all the acceleration values by 20% (e,g, 10000 becomes 8000).
I’d randomize Z seam.
Are you running the aux fan?
Did the part warp and lift from the build plate while it was printing?
Have you run a temp tower cal? What temperature are you printing at?
I don’t think it’s possible to go too slow, but too fast can be a problem.
Yeah I saw they recommended speeds of 50-150mms. Played around and my first layer is pretty good.
Randomized seam
I had all fans off per MH recommendation. I just turned them on starting at layer 17 (that taller face starts at 16). Just printed this with the part fan at 10% for 1 sec. This might be the trick. See pic below. I’ll be printing again with higher part fan speed.
The part doesn’t seem to be warping now that the filament is dryer.
I’ve never done a temp tower calibration. Didn’t know that was a thing.
I’m printing at 250-260C per MH recommendation
Now it looks like layer time is too short. The filament hasn’t cooled enough by the time the nozzle comes around again and it’s “dragging” that previously extruded plastic with it as it goes along…
Temp Tower.
You might also decrease the minimum layer time parameter.
You’re right. I had to play around with the cooling parameters to get it to print right. I still have an issue with where the layer has a shift, but I’ll make another post about that if necessary.
I don’t understand why MH said to turn off all fans, when it’s printing so hot it can’t cool off quickly enough unless it’s printing super slow, but it’s fine now I guess.
Maybe they assume you’re printing larger objects if you’re using Nylon. Or maybe they assume an open-air gantry type printer where cooling is greater.
I didn’t pay attention to everything I did, but I had to manually tune for the MH PA before it printed well. Your experience isn’t unique.
And I found it soaks up moisture like a sponge. My AMS stayed at “1” because the MH filament that was in it was absorbing more moisture than the desiccant. I have to take it out and re-dry it if it stays in the AMS for more than about 2 weeks.
I solve it by printing two objects separated from each other…I determine the distance and the total speed of the quick shift depending on how short the layer is
