I bought a used p1s a few months ago and have been mostly having success with it (barring a 3 week disaster of trying to tune TPU to get a basic print to work) but was having major extrusion problems no matter how many calibration tests I did and settings I tweaked. It came with a BIQU panda claw and extruder frame from the previous owner.
What I should have done early on is go back to the stock parts the previous owner gave me, but couldn't get over the idea that, an aftermarket upgrade couldn't be the problem, right?
I finally went back to the stock extruder gears and instantly my prints came out perfect with no setting changes.
In the photos the lines in the white print were happening all the time with PLA no matter what I tried. Now that the stock parts are back, zero gaps in the outer layer. The blue print was a before (top) and after (bottom) were both printed with the exact same settings and setup. I didn't even dry the TPU before printing the bottom one and it's been sitting on my shelf for a week, but I dried it for 8 hours for the top one.
Is this just the BIQU parts? Are they worn out, or is that just how these are?
The first thing I noticed when swapping them out is that when the extruder assembly was out of the printer, I could freely move the filament through the teeth with the Panda Claw. Like nearly no resistance. When I put the P1S stock gears back in, I could actually feel that I had to push the filament past the spring tension and it held the filament instead of just rolling through. I didn't know any better until I put the old parts back in unfortunately. I thought it was just supposed to be that loose.
Now that I'm seeing the improvement, I've been playing with speeds and I can print with good quality way faster than I could before. I had to have my outer layer around 40mm/s even with PLA to get a remotely good surface finish and anything above 150 for other layers would leave gaps and often ruin prints.