PLA Issues



  • @pverdin Try to close the gap - You want to direct all the air right under the nozzle where the filament comes out and no where else



  • @mpirringer said in PLA Issues:

    @pverdin Try to close the gap - You want to direct all the air right under the nozzle where the filament comes out and no where else

    Part of my testing with a different material today will be printing a new shroud, probably from Rhino. Thanks for the response.



  • Changed material to Rhyno (black) looked fairly clean, I suspect some moisture but still a cleaner print. Changed the cooling shroud and printed the middle two grey guys, still wrinkle butt but now wrinkle face. The far left guy I printed with both doors of the enclosure open.

    0_1573856816258_Spaceguys Front.jpg

    On the back side, same old butt issues two different fan shrouds tested and again the far left one printed with doors open.

    0_1573856892956_Spaceguys back.jpg

    Not sure what the next step, would like to print with PLA for simple economic reasons.



  • For economic reasons HIPS and ABS are cheaper than PLA in many cases and you do not need a fan. From what I see I do think you have cooling issues. YOU can raise the nozzle and put a cup of water under it and lower the nozzle over it so its about 5 mm above the water. If you turn the fan on then you should see a "dimple"depression and some circular waves ideally in the cup with the center under the nozzle. If you don't you might have a fan that does not give you full power or you could also have a break in the wire where it makes enough contact when it holds still but not when it moves as the contact turns on and off. The thing in MC tells you how fast you are telling the fan to turn and not how fast or if at all it actually turns



  • I don't understand all of this, I have never had a fan attached to my printer and do not exhibit any of these problems, with either PLA or PetG.



  • @erniehatt All printers have a fan. PLA needs to cool quickly hence a fan. Most materials need one on bridging. Some like nylon hate fans or even little drafts. So if you want to print PLA you have to have your cooling right or you get lots of crap due to the filament staying soft too long especially on small prints as its still soft when the next hot plastic noodle comes along and your print will look like you tried to make it out of well cooked spaghetty. Its because PLA has to be cooled below 60 or so to have any structural integrity. Whereas Nylon for example is mechanically sound at about 160 C and if its too cool and not still "tacky" then the next layer cant adhere properly. 3d Printing - there is a lot to learn



  • well I built and rebuilt 3D printers, and CNC's, over the last few years, and have printed all the necessary parts out of PLA or PetG, with no fan and they turn out fine.
    I grant you that if I try to print say a spire on a church model then that possibly would be a problem, but generally not, but that said I print everything with solid infill, that may make a difference.



  • @erniehatt PETG does not like a fan. And if the part is big or you print multiple parts then you dont need a fan as by time the nozzle comes around again the filament will have cooled down sufficiently



  • I get the same issue on my pulse with white pro series PLA. NylonX looks amazing with anything I print. Wanted some color so I bought pla pro white. Lots of sags and layer lines.look bad.



  • 0_1574943076555_1569365411497-whiteplapro-resized.jpg I get this with fan on as well.



  • @mpirringer I did do this check and dimples appeared in the water, on either side of the nozzle it seems. Ran out of time and went back to Rhyno.

    Still not sure why the cooling is an issue, but will try again soon.



  • @erievon Looks familiar, not sure what the fix is.



  • This post is deleted!


  • @pverdin That means you are blowing air everywhere you don't want it next to the nozzle and most likely at the nozzle. So you are not cooling the filament and the prints above look like pla with cooling issues. This is one reason I will redesign the hotend and fan mounts. Or maybe someone else got one that works and we can use that. Its not a high priority item for me as I print PLA so rarely and I got a Chiron too which does a nicer job on PLA than the Pulse even with the crappy stock fan mount and there good ones exist on thingiverse



  • @mpirringer Thanks, I will look on Thingverse and see what I can see, I have put PLA on the back burner for now.



  • @pverdin Good Idea. Was printing some prototypes today and for that I usually use filament that I either bought very inexpensive or got for free. It was a reasonably large part - going through the iterations - About 1/2 kg of Filament. So one iteration I printed in Hobby King ABS that I picked up for 4.87/kg looked real nice except its a hideous color. The Other was a spool of Free Prusament PLA I got at the ERRF 2019. That warped all over the place. So I will also stay away from PLA.


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