Well, the first three questions for beginners are usually:
- Did you dry your filament?
- Did you clean your bed with with water and soap?
- Did you do the recommended maintenance?
Then, it really starts to get interesting based on the observed failures.
- The pic at the top is rather peculiar as it indicates a much more severe underextrusion when printing the walls than the infill. This would be less surprising though, if you had “Infill Combination” enabled in the Strength tab. In this particular case, it is likely curiosity rather than a root cause though.
- Usually, it is quickest to just take screenshots of your filament and slicer settings and paste them straight into the post text. There is also an option in Studio to export settings, but I have not yet needed that.
- Frequently, troubleshooting is helped by screenshots of the Filament settings (interesting here due to the likelyhood of heat creep), and the Quality, Strength and Speed settings. Pic’s of the Preview (Flow and Speed) can also help a lot.
- The extensive stringing however is a strong indicator that the filament needs a thorough drying. (See point 1) And maybe a look at your nozzle temp and retraction would help.
- From the first pic, if you still have that issue, drying the filament will not neccessarily resolve all your troubles as it is possible that you have a partial clog. A cold pull can really help with that.
If atm your nozzle does indeed (still) have a partial clog, printing will be more miss than hit no matter what you do. Until at one point the nozzle will advance to a full clog of course.
Regarding TPU93A, that is an entirely different ball park. Bambu recommends TPU 95A and stiffer from the rear spool, with 75D and stiffener being stated as even working in the AMS (havent tried that yet). Softer, like 93A, may require you to feed directly from the top. There are a few threads here in the forum on how to print with TPU and its pitfalls. Here’s just one example. Still, it’ll suffer from partial clogs even worse than PLA…