Frustration with PLA prints not sticking

caviara

Hi all,
i decided to get here for the advise after many hours of frustration and half spool of PLA wasted.
Usually i print mainly ABS and ASA and don't complain from the results, but this time

First some basic information.
Printer:
My main machine and the one i try to use for this project is modified self-constructed HEVO based printer. Linear rails for movement with 20x20 extrusion to support X;
Hemera extruder with titanium heat-brake, copper heat block, PT1000 and 0.5mm "nozzel X";
300x300 MK3 Chinese knock-off aluminum heat-bed (not perfectly flat i know) with BuildTak FlexPlate system on top and BuldTak original sheet on the flex plate.
Duet3 6CH MB (standalone) with IR sensor for bed leveling.

Material used for the project:
FormFutura white rPLA

3D Model i try to print:
https://www.thingiverse.com/thing:4073663

Setting tried so far:
40 to 75 deg C for heat bed
190-215 deg on nozzle
from so close to bed that it leaves a permanent mark on BuildTak to so far that get almost perfect circle on initial layer lines.
Glued "painters tape" on second plate and used all of the above settings again.
Finally - upgraded from RRFW 3.2.2 to 3.3

all of this leads only to peeling edges and on 10-ish millimeters form build plate i stop the print as it is so badly pealed that start hitting IR probe. (forgot to mention that on one of the experiment i used brim)

In conclusion:
Any ideas what to do in order to get this cursed PLA to stick would be highly appreciated.
I apologize for this long post, but i am really frustrated

fcwilt

@caviara

I use the BuildTak system.

I print PLA at 190 and 60 with a first layer print speed of 15 mm/s and a normal print speed of 90 mm/s

I do use baby stepping to get the the first layer height just right but the slow first layer made a big improvement.

Frederick

Phaedrux

As it's recycled PLA perhaps it's not the greatest quality?
https://www.formfutura.com/shop/product/reform-rpla-2838

Do you have any other pure PLA to test with?

ABS etc still stick normally?

Have you cleaned the surface with isopropanol yet?

If PLA won't stick to Buildtak even at high temps and it's leaving a mark on the bed surface I don't know what else to suggest.

How fast is your first layer print speed?

fcwilt

@caviara

If you want to try a PLA filament that I have found to be first rate you could check out FilaCube - I get mine from Amazon.

Frederick

caviara

@fcwilt thanks for the advice - my initial layer speed was set to 30mm/sec...
will try now to go slower.

@Phaedrux on recycled PLA - I though it might be the case and this is the reason to tell the filament specifically.
With ABS and ASA ususally i don't face any problems (granted not so big details in x/y), but i do raft adhesion support on them.
Did not do cleaning with Isopropanol soon - will do it now.

I go with PLA only for this project and only because it was suggested by the part designer.

caviara

Hi again,

Just want to tell the outcome:
cleaned the bed with 95% IPA one and then printed the first layer with 10mm/sec for 3 parts one after over.
These two steps (especially printing first layer slow) made THE difference!

Thank you so much for the advises!

PS
and sorry for the delay with confirmation

tecno

@caviara said in Frustration with PLA prints not sticking:

Hi again,

Just want to tell the outcome:
cleaned the bed with 95% IPA one and then printed the first layer with 10mm/sec for 3 parts one after over.
These two steps (especially printing first layer slow) made THE difference!

Thank you so much for the advises!

PS
and sorry for the delay with confirmation

Lesson learned, IPA clean before every print !