I’m a complete noob in the world of 3d printing. I’ve built a Anycubic linear delta printer and I’ve had this issue during my first attempts at printing. It prints very well during the first few layers then all of the sudden the nozzle seems to almost stab the print. I have zero idea what is happening. Besides this the 40mm cube I attempt to print measures out 39 to 38mm at the few “finished” layers. Please help me.