GiantWinter

I just got a used Ultimaker 2 to replace my previous printer, and so far I haven't been able to get the printer up and running properly yet, and I'd like to ask around the community to see whether I'm doing something wrong, or are there steps that I'll need to do to get this printer going nicely. First weird thing is this. I've leveled the plate as well as I could (using a piece of paper on both tries, since the printer didn't come with the leveling card), stopping at a point where there is a tiny bit of pressure on the paper. While the print was not perfect, I was able to get something like this out of the calibration test print: Now, what is weird is that when I ran the print again immediately after the first print is done, using the same exact gcode from the SD card, I got this: Seems like somehow the nozzle is now too close to the bed on all four corners, but the thing is I haven't even touched anything yet! As in the first image, I think the leveling is almost there, so my original intention was to manually micro-adjust the screws once the printer is printing, but as #2 happened... I'm not sure what to do now. Could there be something wrong with the printer? Is my leveling process all wrong? Any other tips on leveling and calibration?