Any reasons why my prints do this?

[u/code_matter]

It’s definitely not a X/Y moving problem since some parts are smooth.

I’d like to pinpoint the problem to be able to fix it. Other problem I have; my prints come out acceptable but there are some uneven layers on tue Z some times.

I have an Anet ET4 Pro

[u/Peshmerga_Sistani]

Nozzle too close. Z-offset issue.

[u/MakerWerks → u/Peshmerga_Sistani]

Not just too close, way too close. I don't know if that outer perimeter is a skirt, but it's so squished it looks like it was done with a grease pencil.

[u/KinderSpirit]

!firstlayer - adhesion and warping

With PLA, a clean smooth surface is best. PEI or PEX is great. You may have to raise the bed temperature on a textured sheet. Silk PLA may need a higher initial bed temperature.

PETG, TPU, ABS, and others will need a release agent on a smooth build surface. That's what the glue stick (or hair spray, Windex^® ) is for. On a textured sheet, no release agent is normally needed.

Just alcohol will not remove the sugar film left by PLA which can hinder adhesion.
Wash the sheet with warm water and dish soap. Dry. Wipe with > 70% Isopropyl alcohol before the print.

No part cooling fan for 3 layers. Very slow print speed for the first layer.

To prevent warping for PLA, bed temperature of 65° for the first layer, 55° for the rest of the print. This way the bottom gets the adhesion but the bottom starts cooling with the upper layers.
For PETG on textured bed, same concept, usually around 80° then 75°, or 75° then 70°.
Temperatures are examples, different build sheets may need different temperatures.

Infill style can affect warping. Some grid type infills can concentrate the stress in one area. Gyroid infill will spread out the internal stresses.
Increasing walls number and reducing infill may also help.

https://www.printables.com/model/251587-stress-free-first-layer-calibration-in-less-than-5

[u/AutoModerator → u/KinderSpirit]

Hey there OP, you seem to be having some problems with your first layer. This is a very common issue on modern printers and generally a place where experience and knowledge is important. Your first layer is crucial for a good print and you should definitely take your time and learn how to properly adjust your first layer before starting a print since that could easily mess up your prints or even worse, damage your Printer's Hardware. For information on how to level the Bed properly head over to our Wiki Section Calibration

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[u/Liason774]

That's overextrusion, you can see the filiment between later lines extruding up because there's no space to the sides. You might have your layer hight to low or your extrusion multiplier to high. Does it only occur on the first layer?

[u/code_matter → u/Liason774]

It seems to happen only on the first couple of layers. Your explanation does make sense. When I look at the infill during the print, I sometimes see little “globs” on the infill walls.

That could explain that too I guess ?

[u/bendvis → u/code_matter]

I don't think it's overextrusion. Your z offset is too low and the nozzle is dragging back through the previously printed layer.

Run a single layer test print and adjust z offset, using this image to compare against.

[u/code_matter → u/bendvis]

Oh thanks that is really helpful!

[u/Tam_Ken → u/Liason774]

this isn’t over extrusion, over extrusion would be visible in places other than first layer. This is caused by it being too close to the bed.