Hello,
Im new here so sorry for my bad english
I bought the Vellemann Vertex k8400 a few days ago and already printed a few things
now I wanted to print a larger figure with a square floor
After beginning with the diagonal stipes (about 1-5 lines) it seems like the axis is bocked bcs it makes that horrible noise
Link to Picture of print:
https://www.dropbox.com/s/y6m5cbgu16rnf6x/20160324_181837.jpg?dl=0
Sound like the X and Y axis may need to be aligned
Check this link for help.
http://www.k8xxx-3dprinters.crimed.be/w/index.php?title=XY-Carriage_Alignment
well I aligned them now and everything works
except for the auto home function
always when I want to calibrate the y-Axis works perfectly fine but the x-axis is buzzing and making terrible sounds
its like the endstop doesnt get triggered
but it works because I tested it out
help?
I had the same issue jojo mos.
What I did was aligning the X-Y axis and calibrating the stepper drivers. I had one which was way to low, only 0,150V.
Then I disconnected the cables of the end stops, normally when these get triggered the movement should stop. Which was not the case for me. Afther I disconnected the cables I cleaned them to be sure and reconnected them. - This was already a solution for me
If this does not help for you, you should try switching some of those end stops, and see if the problem moves to an other location. If so, you probably have a defect end stopper and need to make a ticket for that.
By the way, don’t forget to check all the cables on your mainboard. Check if you plugged them in on the right spot, and if they are connected well. (No harm in cleaning those contacts aswel)
Good luck! 
thanks for the idea tommeysen
But I mentioned that the slide didnt trigger the stop bcs it was stopped by a pulley and couldnt get any further
I put the pulley a bit further and the problem was solved
Now when I print there are weird bobbles at the end of my lines
any ideas ?
https://www.dropbox.com/s/azmmhoow5vcyl6x/20160325_124153.jpg?dl=0
Try going into the Cura Configuration.
Change the retraction to 3 or 4mm I use 4 and change the retraction speed to 110mm
For printing PLA 190C is a good starting point.
