I can't figure out how to name this problem or solve it (Ender 3 Pro with Bigtreetech Board and Touchscreen, BlTouch)
Hello everybody,
I want to print something for my family but the hotend gets clogged every time in the same part of the print. I tried:

Different Nozzles
Different Filaments
I cleaned every Part
The E-Steps are set right
The retraction Setting didn't make a difference
The Extruder Position is perfect
I tried different speeds
Everything else you find on Google with a clogged hot end.

The most odd thing about this is that the problem occurs at the same place every time.
On Flat surfaces are some anomalies, that wasn't there when I had the normal clogged nozzle problems (from: retraction settings, dirty Printer, e-steps false). I think it has something to do with the anomalies.
Another thing I don't get behind are missing layers after the layer change,
even when I don't use retraction at all.
In The Picture from the side you see the Support with the Layer change problem.
After around about Layer 40  there is one Layer missing and the next Layers are not connected anymore.
From the top you see the Surface anomaly I don't know how to describe.
It would be helpful to know what I did wrong. I am sure I did Everything against a clogged Nozzel but I can be Wrong so tips in this direction are Helpful too.
I am quite new to 3D Printing(2 Months) I had the usual clogged Nozzel Problem Solved and It Worked Perfectly. I Tried to Fix It with the same Solutions and Nothing Helped, so I think it is a different problem.
Sry for my bad English I am from Germany.

I have an Ender 3 Pro with Bigtreetech Board, Touchscreen and BlTouch which I use together with [insert slicer here]. I print in [PLA/ABS/PETG/Whatever Material] at [Extruder temperature] °C. The print bed is set to [Bed Temperature] °C. I use a print cooling fan at [whatever] %. The layer height I set to 0.[x] mm, the line width [line width/extrusion width] from the 0.[x] mm nozzle. The Printing Speed is set to [x] mm/s for walls and [x] mm/s for infill. My retraction is [off / [X] mm at [x] mm/s].
I'm an Ender 3 Pro user and I've been through almost every problem this machine has.

If you are on original hotend and Bowden style extruder, then first try the hot end PTFE fix


What the picture may show is a temperature too low, especially on these bad layers. Raise the temperature like you have tried (200 °C is good).

To avoid prints being knocked off the bed, try brim (it's in bed-adhesion in Cura), most people don't use raft anymore. What brim does is to add addition loops on the first layer of your prints and make it sticks as good as possible.

No raft, add brim. Then disable Z-hop, enable combing in Cura.


These steps should be able to mitigate the problem.