Hi everyone, i have a littl Problem with some inconsistens layers. every time i print an object that is higher then a few cm i got strange layers that look like they were not completly filled or grainy or something like that.
i tried various temperatures but with higher temperature the problem seems to be increasing:
the left one was printed at 215 °C and the right one at 190 °C
the first few cm look really good but then it goes strange.
Im using grey Velleman PLA
Last week i did a 12 hour print which went really good but you can see the same line every few cm or sometime even multiple lines in a cm distance.
Has anyone an idea what could be causing the problem ?
The printer is lowering the printbed per X steps of the Z axis stepper motor, which leads to steps of 0,0075 (as rrekwa explained me, viewtopic.php?f=62&t=14494). If your layer thickness is not a multitude of 0,0075, then it will round up (or down maybe) the the steps (as the motor can only move full steps), which will make 1 in X layers (X depending of amount of rounding up or down) 0,0075 mm thicker or thinner and filled with the same amount of filament. The nearest multitude of 0,0075 to 0,2 is 0,2025. As i don’t know is repetier and the firmware can handle such small magnitudea my 0,2 layer thickness is set to 0,21 (the LED display show magnitudes of 10^-2).
I use Cura for slicing and the first layer thickness can be set in mm. When your slicing software uses a percentage for the thickness of the first layer make sure the percentage times you layer thickness is also a multitude of 0,0075 and has a magnitude of 10^-2.
Taking into account the Z steps for the first layer thickness (as I already took them in account for the layer thickness) solved the ‘line problem’ for me.
[quote=“kveite”]The printer is lowering the printbed per X steps of the Z axis stepper motor, which leads to steps of 0,0075 (as rrekwa explained me, viewtopic.php?f=62&t=14494). If your layer thickness is not a multitude of 0,0075, then it will round up (or down maybe) the the steps (as the motor can only move full steps), which will make 1 in X layers (X depending of amount of rounding up or down) 0,0075 mm thicker or thinner and filled with the same amount of filament. The nearest multitude of 0,0075 to 0,2 is 0,2025. As i don’t know is repetier and the firmware can handle such small magnitudea my 0,2 layer thickness is set to 0,21 (the LED display show magnitudes of 10^-2).
I use Cura for slicing and the first layer thickness can be set in mm. When your slicing software uses a percentage for the thickness of the first layer make sure the percentage times you layer thickness is also a multitude of 0,0075 and has a magnitude of 10^-2.
Taking into account the Z steps for the first layer thickness (as I already took them in account for the layer thickness) solved the ‘line problem’ for me.[/quote]
oh okay i didnt knew that i will try that out tomorrow, im using simplify 3d for printing and im able to enter layer height up to 4 digits so entering 0,2025 is no problem but i will have to test that tomorrow, its getting to late for printing today, i will try 0.21 also.
thanks for the help i hope i can get these lines away besides the lines the printer prints really good
[quote=“kveite”]The printer is lowering the printbed per X steps of the Z axis stepper motor, which leads to steps of 0,0075 (as rrekwa explained me, viewtopic.php?f=62&t=14494). If your layer thickness is not a multitude of 0,0075, then it will round up (or down maybe) the the steps (as the motor can only move full steps), which will make 1 in X layers (X depending of amount of rounding up or down) 0,0075 mm thicker or thinner and filled with the same amount of filament. The nearest multitude of 0,0075 to 0,2 is 0,2025. As i don’t know is repetier and the firmware can handle such small magnitudea my 0,2 layer thickness is set to 0,21 (the LED display show magnitudes of 10^-2).
I use Cura for slicing and the first layer thickness can be set in mm. When your slicing software uses a percentage for the thickness of the first layer make sure the percentage times you layer thickness is also a multitude of 0,0075 and has a magnitude of 10^-2.
Taking into account the Z steps for the first layer thickness (as I already took them in account for the layer thickness) solved the ‘line problem’ for me.[/quote]
Thanks for the help again, that solved my line problem too, now when printing at 0.09 /0.12 or 0.21 all goes well and i get no lines in my prints anymore
now i just need to get the rectraction lenght for dual head prints in line so that everything goes smoothly
But still, I have the same problem. Every one centimeter or so, I have a (or multiple) faulty layers. I thought it had to do with the threaded rod maybe?
Random lines or lines at cretin heights are most likely bad liner bearings.[/quote]
and how to you solve this issue… i have exactly this every tread i have a few inconsistent lines which are - as i measured it - smaller then others and compressiong the filament more and making these layers wider
this makes the walls ugly… so far i did not found a solution and i also played around with the settings as i first suspected rounding errors of the layer hight and steps/mm for the z-axis
do i need to replace the rod?
then i suppose this is a warranty case…
This may sound strange.
Mine was making a lot of noise and vibrating.
Instead of waiting for parts I removed the Z rod and turned it over and remounted it.
I don’t know why but that fixed it.
I did think it would help but it did.
I started with mounting the rod upside down and took very good care in mounting it and took care of carefully tighten the set screws to not put pressure on the coupling
this worked for me, prints come out very nice now.
i also made some changes in the layer height as suggested as well and this further improved the overall quality…
besides the lines the printer prints really good