I am not sure it matters to be honest about be in a CC building.
You are controlling the extruder and the bed with a PID program.
I have learned a bunch over the past few weeks.
Lost a bunch of hair for sure.
(1) LEVEL THE BED - this is critical. 1/2 your issues come from your bed being not level.
(2) Check the default settings in Cura - For me the default settings were 2.85 filament size. Cause major voids in the print. It should be 1.75
(3) Not all PLA uses the same temp settings - One each roll there is a recommended temp range. Generally speaking 190-210 on E and 50-60 on B
Now for the bed mat.
I installed auto level on my printer. It required flashing the firmware to Marlin and then installing the Anet style sensor.
Problem with the non-contact sensor is that you can not use a thick bed mat or glass. The green mat was too thick for the sensor range.
I ended up going back with blue painters tape.
I level the center of the bed with a piece of paper.
Once its centered then I go do each of the corners twice.
You have to do it twice because when you make adjustments on one corner, the other corner on the same Z axis will shift slightly.
Something I have learned with the auto level sensor.
No matter how level you think your bed is, its not.
The auto level program starts at the center of the bed.
Then it moves and checks 9 points.
3 points across and 3 points deep.
it displays on the screen what the Z axis measurement is for the sensor at each point.
On my printer its a 1/4 mil across the entire bed.
The problem is the bed itself isn't a perfectly flat piece
I am printing a Z- axis upgrade piece. I have already done the upgrade on my machine but I am putting together a little care package for those who get a A8 printer.
https://www.thingiverse.com/thing:2436455
Attachment 216209
It requires 2 bearings ->
https://www.amazon.com/gp/product/B009Y9IRNA
There are other bearings being sold that will work for cheaper but these are what I purchased and they work. Plus they are cheap.
Now for my care package
Fan spacer
Z-wobble upgrade (you need to order bearings)
toggle switch with 14ga tffn wire
Filament tube (spare)
I sent one to Jmorris (minus switch and zwobble)