Hi all,
please help me with my velleman k8200. I’m new to 3D printing, I’ve bought and assembled the printer. Then I’ve calibrated it. when I controll it manualy, it works quite well, but when the print starts, it shifts layers like crazy, first layers is in the center of the bed and in 5th layer, it ends on the edge of the bed… I’ve done every software configuratin from manual. I’ve also tried mess with speed setting a bit, but all I can improve is less shifting but it is stil dramatical…
I would appreciate any help or suggestion.
Tighten the pully of the belt, hex screw of the pully. Second solution is a spring on the belt to get more tension on the belt
My first guess would be missed steps in that axis stepper motor. Check your stepper driver is properly adjusted and the jumpers under the driver are correctly configured. If none of that made sense, go read the relevant section in the K8200 build instructions, available here. http://www.k8200.eu/locale/ Otherwise, too little or too much tension on that axis belt. Seized linear bearings. Print speed too high? When I built my Velleman, I found the default print speeds way too high for high quality prints. My modified K8200 prints exceptionally well, but only at moderate speeds. Due to their design, they can never achieve the same speeds as a good delta or corexy.
Thank you for your replies, I’ve already figured it out… It was caused by bad measurements of motors voltage… At first calibration I measured it with bad multimeter, now I tried another one and voltages were bad…
Now it prints without shifting layers…
Thak you alll 
Now I have another shifting problems… First test cube came out without shifting, but from the second print, every print shifts along the Y axis after like
5-10th layer… If I move with the bed by hand, it moves smoothly belt seems to be tighten well…
I own one too and have had this issue. Does the shifting happen on just one axis or both x and y?
It can happen with your nozzle creating too much friction with the bed or print. For lessening the friction, adjust the flow rate, calibrate Z height and use the Z-hop setting to have the nozzle avoid the print.Make sure your belts are tight enough.
If this does not work it can be related to your motors - change the default XYJERK setting in your printer’s firmware from 20 to 10. It prevents the printer from making tiny zigzag movements that happen in small areas for example if your print wall is 0.1mm thicker than a multiple of your nozzle size. Check p.535-539 of the assembly manual for further motor calibration.
Also check the driver voltages and tune these to 0.5V if problems persist.
I see. Your second message seems to be related to too much pressure buildup - try lowering the flowrate of the nozzle by a few percent.
I am having the same issue at the moment with our Ultimaker Original and bet it’s the motor drivers.
Shifting happens only on Y axis. And now when the motor makes fast moves, I can hear strange sounds and it doesn’t move…
I deatached the bed and moved the nozzle up, does the same sounds… I’ve also tried tuning voltage to 0.5V and messing with belt tension… it doesn’t help.
I wonder, why the first print came with no shifting and the second print shifts and motor makes these sounds…
Sometimes this is a combination of several factors. See if you can move the nozzle even a bit further up to take away the friction factor. Also did you change the XYjerk value and reupload firmware through Arduino?
I’ve dismantled the bed and moved the nozzle to the top… after that I realised, that on the one X rod bearings moves a lot smoother than on the other rod. I’ve tryied to lubricate the second rod And now it works
thank you all for suggestions
