I have bought an Ender 3 Pro in November. I loved 3D printing and even upgraded my machine to improve my experience. However, lately, I can't print anything due to an issue I can't seem to resolve.
I will provide as many details as I can in an orderly fashion.
My machine: Ender 3 Pro w/ BLTouch clone installed. Running Marlin's latest bugfix branch. Also has a Raspberry Pi with Octoprint built into the PSU so I can control both the Power and functionalities of the printer. I have a glass bed, red aluminum extruder.
- Printing with PLA;
- Hot end at 200 °C;
- Bed is at 70 °C;
- ABL is on;
- Nozzle: 0.4 mm;
- Layer height: 0.2 mm;
- Slicer: CURA
The issue: While the first layer is printing, the filament bunches up around the nozzle and if it somehow touches the bed (like I reduce the Probe-Z offset) it doesn't stick and drags on a few mm. It eventually sticks and keeps printing fine for long straight lines but it's impossible to print a little circle inside, for example. The small details aren't printed on the bed, the filament just bunches up around the nozzle.
Also when I do a cold pull(heat up to 200 °C then pull at 90 °C, the tip of the filament looks like this:
I have tried the following:
- e-step calibration
- PID Autotune
- Lowering/increasing temp (210-190 °C)
- Lowering/increasing first layer speed (+/- 10-25 %)
- Changing the heat block and the throat tube (twice)
- Taking the entire hot end apart and cleaning it and changing the nozzle (even re-cutting the PTFE tube) multiple times
My theory is that the heat traveling up the cold block thins out the filament, causing under extrusion. The filament can't properly stick to the bed because it's too thin. But the hot end fan works. Should I still replace it?
Or is my problem something completely different?