Anybody who knows what causes this?,

Anybody who knows what causes this?, it seems like the y axis dosen’t move enough

its either software, mechanical, or electrical related. What else can you tell us. Did your printer ever work, is it only recently going wrong but used to work, Who is the manufacturer, what software are you using?, give us some clues,

It’s a New flsun i3 clone, running marlin 1.1.2, never worked

Using repetier host

Are the two pictures of the same cube?

Can you jog to the extents of your bed?

Could be that your bed size is not properly defined and the print is simply cutoff from where you placed it on the bed?

Yes

I had something similar due to my z-axis motors turning off which allowed them to drop a bit during a print. You may want to check your firmware. Most likely it’s incorrect steps though.

How do i fix incorrect steps?

Look in your software for a command or line of code with "Steps"in it, it will be listed for X, Y, and Z axis. Just recheck that all three have the same numbers entered. If the Y axis is out, it will have a different number than the X or Z axis. To fix just change the Y number to match the other two. If all three axis have different numbers, then get back to us cause calibration is another can of worms.

Great!