Printer not printing like it is supposed to.

[zvone]

Hi, I'm new to 3D Printing. I recently got a Renkforce Pro 6 Printer and lately it's been doing a lot of mistakes while printing. As you can see in the attachment .jpg, it created a mess in the beginning, when I was trying to print 2 Lego Bricks. Any suggestions on what I should try to solve this problem? Thanks in advance