[First Layer problem: One of the non-regulated corners is under extruding]

And here's another picture showing overall detail of the first layer.

[First Layer problem: One of the non-regulated corners is under extruding]

Hi, guys.

We recently received UM2 for our project and I was excited to have an opportunity to get involved into 3D printing which is awesome indeed!

My project is an enclosure for a tablet.

The print is quite large.

220x165x120mm.

Height is not a problem, nor is the length of the object.

I have a weird problem of under extruding that occurs only in one corner when making first layer, which actually is non-regulated, top-right hand corner.

I need that surface to be smooth as a mirror and just of this behavior, the print is not perfect at all.

I am attaching 2 pictures that are showing the problem.

Another problem is with scratches all over the print, that I have no idea how to fix, although I tried to fine tune Z Hop.

Settings that I use at this moment:

Filament - Atomic bright white 2.85mm

Nozzle - Olsson block mounted - 0.6mm

First and the rest layers - 0.3mm

Speed - 30mm

Bottom layer speed - 25mm

Shell - 1.2mm

Botto/Top thickness - 0.9mm

Nozzle temp 230C

Bed temp 55C

I'd appreciate if you could help me identify the problem.

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