I had the Same Issue, you have to cut the small "knob" on the Z-Endstop, so that you can set it low enough, otherwise itr will never reach the bed

You could try to activate Z-Hop in your slicer, also i would not using a higher Bed-Temp for the first layer, caused only problems for me.
A BL-Touch could help, (If you are Using UBL-Leveling) but its not the holy grail i thought it would be.

Also Check your X-Gantry, it could be that on the Left side of your printer, it sits lower than on the right, that would also cause Problems like described

Greets AsusDK

it could be that one of your belts is not tight enough, try to tighten your belts, should fix the problem

Anytime if you change the Cooling, the Hotend, the Heater or anything that can impact the Temperature, you should run an PID-Autotune

M303 C10 E0 S210 U1 // Hotend - 10 Cycles to 210 Degrees

Greets
AsusDK

I guess you are not using an Bed-Leveling sensor like the BlTouch right ? If it is so, then you can try to set your Z-Endstop higher, until your height ios good, otherwise try to set your Z-Offset, for Sample: M206 Z-0.2 will raise your Nozzle 0.2mm higher than normal, save it after you finetuned that with an m500

Greets
AsusDK

It looks like a very strong Underextrusion, if you dont have modified your Printer, so if youre running the Stockextruder and also the Stock hotend, i would guess that you have a Clogg, heat your Ender3 to the Temp you are using for your Filament (f.s. PLA 210 Degrees) and then push a bit trough the hotend, then Pull it out, and check if the Bowden Tube is correct and without any Play inserted in the Hotend. If thats not helping, try to Calibrate your E-Steps (https://teachingtechyt.github.io/calibration.html#esteps)

greets
AsusDK

Maybe in your Firmware is PID active even for your Heated Bed, try tu run the Nozzle and the Bed PID

M303 C10 E0 S210 U1 // Hotend - 10 runs to 210 degree
M303 C10 E-1 S60 U1 // Bed - 10 runs to 60 degree

use some software like for sample Pronterface, to see all the responses from the printer, after it states that the PID-Autotune is finished, save with an M500

Kind Regards

Hi @ all,

i bought the original Creality Linear Rails Kit for my Ender 3 Pro, on Banggood.com,
(https://www.banggood.com/Creality-3D-Ender-3-Linear-Rails-All-Kit-for-Ender-3S-or-Ender-3-Pro-3D-Printer-Part-with-Leveling-Sensor-p-1728277.html?rmmds=myorder&cur_warehouse=CN)
but i dont find ANY Instructions, not Online on the Creality Website, not in the Package or anywhere else, even the Creality Support, could not help.... does anyone know a Source of an PDF or maybe a build video or something ? I bought the Kit for 140€ so nearly as much as the Printer itself, but i cant figure out how to use it...

Thanks a lot in advance
asusdk