The tool was damaged Jazz, brand new as well I bought 3 of them other 2 perfect.

Was causing that line effect.

The real issues I was having is the Z axis was bottoming out causing it to lose a step with certain tools (Short ones) as it hit the ballscrew mount. Why my 2d engraving was fine was never bottoming the axis.

My AM882's on my X&Y fire fault protects if they hit the ballscrew mounts only happened when my dodgy home switch soldering came a cropper lol.

But the Z can bounce off the mounts all day long guessing my motor isn't powerful enough to trigger it only a puny 1.2nm, it's getting swapped for 1.8nm ones just because I'll have a couple of spare and I bought them new, the 1.2nm one is 2nd hand and well worked.

My solution add another sheet of MDF to the bed to raise it another 18mm I might add 2 to raise it 36mm. Tomorrow I shall test my theory but well it was bottoming out on the mount and I was losing steps on the Z so I think it's a no brainer.

I have 9cm of travel so can afford to lose some.