PLA not sticking at all.

This topic contains 8 replies, has 4 voices, and was last updated by  Mike @Pix2Proto 5 months ago.

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  • #89280

    Jeff
    Participant

    Need some more help folks.  Here is what my specs are:

    Bed level to with 0.02mm in all 4 corners
    X Axis level to within 0.02mm also
    Z Axis home (end stop) is set so that the extruder head is close enough to the bed that a 0.04mm feeler gauge just barely fits under it.
    3M Scotch Blue Advanced Edge-Lock painters tape on a glass plate.
    Extruder heated to 200c
    Bed heated to 60c

    For some reason, the PLA is just all balling up under the extruder and not sticking. The G-code I’m running has the Z Axis set to 0.2mm for the first layer. Here is a link to the thingiverse file I’m using: https://www.thingiverse.com/thing:2987803

    I will try to post up a video of what is happening but for now here is a picture.

    Any thoughts on where to begin to troubleshoot this??

    Attachments:
    #89288

    Ryan
    Keymaster

    Not really sure but I have only ever used plain 3M blue tape. Not sure about scotch or edge lock. If it is anything like hairspray, it matters.

    #89294

    Jeff
    Participant

    Thanks Ryan, I will go out tomorrow and get some regular stuff then and give that a shot.  Do my tolerances seem within reason to you?

    #89295

    Ryan
    Keymaster

    Yeah, if it touches the bed it should pretty much stick. The tolerances don’t really come into play for a few layers when it might curl.

    #89296

    Mike @Pix2Proto
    Participant

    I have had good luck with the cheap-o painters tape, I have never tried the edge lock stuff.  Might be able to rough it up with some fine sandpaper to help.  Not sure what you have under that tape, but if its glass you can try bare glass or glass with glue stick if you have it.  There shouldn’t be enough room for the filament to curl up on the first layer… do you have a M851 Z-offset loaded that could be causing issues?

    -Mike

    #89297

    Jeffeb3
    Participant

    The blue tape has some kind of plastic in it (pva, I think), which is why it works. I don’t know about other tape types.

    When you get a little closer just know that the actual numbers are just a guide. The way the plastic gets laid down will tell you more than the numbers.

    #89303

    Jeff
    Participant

    Thanks for all the suggestions and tips.  I checked the tape I have and it seems to be very “slick” (I’m guessing so paint doesn’t stick to it easily so made that’s causing the issue.  I do have a glass plate and glue sticks (from my kids) so I might give those a shot as well as getting “normal” blue tape tomorrow.  I’m not sure about an M851 command but I’ll check.  My settings are Ryan’s default firmware and the slic3er settings he recommends.

    #89304

    Jeffeb3
    Participant

    M851 is only for leveling, so I doubt it’s enabled.

    1 user thanked author for this post.
    #89314

    Mike @Pix2Proto
    Participant

    @jeffb3 is correct, sorry I have been too used to running my printer that probes with a bltouch, please ignore my comment about M851 😉

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