Plunge hole

Could be an optical illusion because of the perspective, but my impression is that the endmill is not perpendicular to the table.

Other reason could be that you have play in the machine. If you wiggle right on the tip of the endmill, do you feel any movement in x or y direction?

I have a little play in the endmill. but how come all the lines are good and it only plunge off it own line?

Did you watch the milling process? I could imagine that these holes are placed where the mill goes deeper into the material.

If you go down in a ramp it might help for the moment.

But in the end you should fix play, backslash and set everything straight.

Your lines are cut with the cutter loaded in the direction of travel. A plunge has no sideways force, so backlash allows the effect you are seeing. If you did a spiral plunge with a smaller endmill you wouldn't see the nick, but your tool path would need 2 sweeps per layer.

The other option would be to not use plunge and lower the cutter into your tool path as you go (spiral cut in CamBam). That is what I do here if your software allows it.

Ok, so i need to fix the play in the Z axis. I will try that (i was hoping it was a setting).

I found the problem... I had the settings set at a 3mm drill. But i used a 2mm drill.
How do you keep them separated? I have no tool to measure good (apparently).

i use an old transport box where i put the mill bits in at the richt order to use them
0.4 in the first 0.5 in the next 1 mm in the therd and so on
i cant make a mistake using the wron mill bit

It looks like you may be cutting deeper than the flute length of the cutter.
If the body( shank) diameter of the cutter is larger than the cutting diameter, then when you plunge in to the full depth the shank will force the wood away, leaving what you see in your pics.
Once the profile milling is started then it is less noticable.
Example
Shank body dia= 3mm, cutting flute dia= 2mm, flute length = 12mm
You can only cut maximum depth of 12mm .

SjorZZZie

I made a box with Vectrix using the dovetail gadget and a piece of building foam.
now I can pick my bits whenever I need them without spitting true all the boxes.

maybe an idea for you.