PLA not sticking in specific area / spot  

Re: PLA not sticking in specific area / spot

additional picture, is there a limit of attachment?

live z adjustment start from -0.370,
there's is no changes even when i lower it to -0,380,

then it's oversquished, the print get pulled , so i raise again to -0.370 to -0.375

already adjust the bed level correction too

left :1
right :2
front :4
back :-4

Re: PLA not sticking in specific area / spot

Your problem is the reason many of us turn to the hyperfine bed levelling thread and use the 9 point bed level tuning.

Re: PLA not sticking in specific area / spot

ok, thanks

is this the one your refer?
https://shop.prusa3d.com/forum/prusa-i3-kit-building-calibrating-first-print-main-f6/hyperfine-bed-leveling--t4330.html

or you have another guide regarding this? thank you

Re: PLA not sticking in specific area / spot

That's the one.

Follow the links in the more recent posts by Waldemar G. to get the newest Hyperfine enabled software from his GitHub repository. It usually takes me a couple of iterations to get all the points set and as close a I can to optimum thickness using my micrometer.

Re: PLA not sticking in specific area / spot

Or just clean the bed with acetone and afterwards with 99% alcohol. If that doesn't help roughen the surface with ~3000 sandpaper. Ideal leveled surface is not really required to let PLA stick to the bed.

BTW: Your PEI sheet looks after 8 months like new. Mine looks after 3 month already heavily used.

Re: PLA not sticking in specific area / spot

Hi Petrus,

My MK2 is about the same age as yours (june 2017) and I got the same kind of issue recently (this week).
I encounter major warping when printing PLA and very bad surface adhesion.
The first layer calibration is also not sticking properly, while the extruded PLA is properly deposited on the surface as described in the manual.

Initially I believed warping was related to the cold temperature in the room (18°C)
I increased the temperature in the room to 20 then 22° without noticeable enhancements.
Recent Slic3R version have increased the temperature of the bed from 55 to 60°, it helped a bit.
In this direction, I measured precisely the temperature of the bed when the ambient temperature as 20°:
From the thermometer: 20.5, from the two thermistors of the prusa: 26° (both head and bed)
When the bed was heated at 60°, the surface was measured at 48° (that's 12° difference !).

I decided to print with the bed set to 65° (failed to stick to the surface) then 70° then PLA sticked to the surface (measured 56°).

Small parts were not properly extruded: I suspect the printing head was also too low in temperature to extruded properly small quantity of matter (head set a 215°, measured ~190°)

Is there an issue with the temperature control of the MK2 ?
I will double check the thermistor, but if it would be removed , the temperatures would be higher, not lower.

Any comment are welcome.
Jerome

Re: PLA not sticking in specific area / spot

That's the one.

Follow the links in the more recent posts by Waldemar G. to get the newest Hyperfine enabled software from his GitHub repository. It usually takes me a couple of iterations to get all the points set and as close a I can to optimum thickness using my micrometer.

hello william.c14,
I will try to read all the post, but it will certainly takes time.
i decided to update the firmware and driver, and everything goes fine.
guess i'll keep that for now.

Or just clean the bed with acetone and afterwards with 99% alcohol. If that doesn't help roughen the surface with ~3000 sandpaper. Ideal leveled surface is not really required to let PLA stick to the bed.

BTW: Your PEI sheet looks after 8 months like new. Mine looks after 3 month already heavily used.

hello nikolai.r,
haven't tried acetone, but i use 90% alcohol, i did tried sanding it few weeks ago but with 400 grit, i didn't notice any difference except a light white scratch (which isn't visible in the picture because of light reflection)

also, i thought that battle scar (heavily used PEI) is very cool, feels very experienced veteran, although we might want to keep our machine shiny

Hi Petrus,

My MK2 is about the same age as yours (june 2017) and I got the same kind of issue recently (this week).
I encounter major warping when printing PLA and very bad surface adhesion.
The first layer calibration is also not sticking properly, while the extruded PLA is properly deposited on the surface as described in the manual.

Initially I believed warping was related to the cold temperature in the room (18°C)
I increased the temperature in the room to 20 then 22° without noticeable enhancements.
Recent Slic3R version have increased the temperature of the bed from 55 to 60°, it helped a bit.
In this direction, I measured precisely the temperature of the bed when the ambient temperature as 20°:
From the thermometer: 20.5, from the two thermistors of the prusa: 26° (both head and bed)
When the bed was heated at 60°, the surface was measured at 48° (that's 12° difference !).

I decided to print with the bed set to 65° (failed to stick to the surface) then 70° then PLA sticked to the surface (measured 56°).

Small parts were not properly extruded: I suspect the printing head was also too low in temperature to extruded properly small quantity of matter (head set a 215°, measured ~190°)

Is there an issue with the temperature control of the MK2 ?
I will double check the thermistor, but if it would be removed , the temperatures would be higher, not lower.

Any comment are welcome.
Jerome

hi jerome.k3,
i think the temperature play a part in this, my ambient temp is around 25c,
i recently tried to update the driver and firmware, the setting is 215/60 rather than the usual 215/55
and its come out beautifully

UPDATE:
yesterday, i decided to update the firmware (from 3.0.2 to 3.1.0) and update the driver (2.1.4) and slic3r to 1.39.1 for my printer.
it shows huge improvement, i don't know if the auto bed leveling decided to finally calculate more precise, or the gcode comes from the slic3r is better, or the bed temp, which is increase from 55 to 60
in conclusion, i have printed 2 object so far without changing any of the setting since the update and the first layer is going very well.

i'll take this for now and hopefully this printer continue to make the production have more stable output

thank you all for taking your time to reply to me.