Your axis might be slipping. Does it always happen at the same spot? If not, It might be in your software. Also, your extruder might be getting stuck on your print and skipping steps.
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Add a cooling fan to reduce warping and lower your travel velocity to 100mm/s. As someone else suggested, adding z-lift with retractions. Also, if this is a generic kossel kit, check your X,Y and Z acceleration. 9000 is typically too high for average stepper motors. Lowering to 7000 will give you more reliable printing and higher quality prints.
It definitely sounds like your move speed is too high (not your actual printing speed, but the speed for moving between parts) and/or your motor acceleration values are too high in firmware. To test lower acceleration speeds without having to reflash your firmware, go to control -> motion -> scroll down until you see acceleration and lower to 2000. Than scroll down further and change each of the individual motor (x, y, z) acceleration values down to 7000. Start there and see if it is improved.
My acceleration is at 3000 and my x,y,z acceleration values are all set to 2000 already
You have a fan like this?
If it is warping, you’d see a ton of it on the bottom half of BB-8 (assuming you’re printing the whole sphere and not half at a time).
This is usually the quality of my prints, this is one of a bunch of parts I printed this past weekend for a new kossel project I want to start myself with a much larger printer area. As you can see I have no issues with quality, distortion or leveling, its just a lot of the time with multi separate rises I get the issue i originally described, now the PLA in the pic i have not had that issue with but I have not tried any of the usual problem parts I get this issue with with the PLA yet. When I get a moment I will attempt a problem part and upload the results for a better assessment
Hello i had the same issue , after doing all the things they mention here ,what is right ,
i came to dicover that 1 motor was bad ,
he skipt an step or 1-2 . i had lose him from the belt and turned it by hand ,at an piont turning with same force by hand the motor feeled like he had an skipping,and crackfeeling, after replace the motor all went good no problems anymore since then .
the motor was striped and the failure was 1 defect barrel in the tiny bearing. I think there was tomuch tension or force on the motor, in the past.
so if nothing works try this .
When it happens to me again i check the motors first, this is much faster then do all the settings and so on .
but till now i have no problems at all.
cheers . mike
My fans are exactly like that. The BB8 I am printing is 3 parts, center hub for mechanics and two side pieces. I get some curl up at bottom right on platform but no where else on him. I do not have a heated bed
Such error during the print may be cause by few reasons
1- while you were printing the printing head encounter an obstacle which prevent the head to move correctly in the X Y dimension, probably cause by an over extrusion of the previous layers, an over extrusion may pile up ever several layer before it become an issues I suggest diminishing the over extrusion parameters or increase the layer hight
2- While you were printing a resistance may have been encounter in X or Y axis both at the same time is not probable which can have prevent the printing head to move to its proper position, for that check your assembly and grease the X and Y moving roads with a white grease for metal
3- The last probable cause is way more touchy to adjust, each motor you have in your printer is control by a step motor chip, these chip have a small calibration knobs which control the amount of power sent to the motor for each move, increase it and you will provide the motor with more power to surmount small obstacle if you give to much the motor will overheat and lose longevity, not enough power and you may encounter problem like your describing, But I repeat this is very tricky and such be done by expert 3D technicien.
Hope these will help you, Have 3D FUN
Yvan