Stringing with all filaments and banding across surface: Where to start diagnosing?  

Stringing with all filaments and banding across surface: Where to start diagnosing?

I have three MK4S printers and the issue is with the MK4S that was upgraded from a MK4 and had the MK4 enclosure installed at the same time.(The enclosure was sitting around.)  I'm a bit lost on how to further diagnose this printer and would love some guidance.  My assumption is an issue with extruder calibration.

Problem Printer(Upgraded MK4 to MK4S with MK4 enclosure):

• All filaments(PLA, PETG, TPU) have stringing of various amounts from least to most.  I can take the same filament roll and stick it into another known good MK4S and it will print perfectly.
• The surface finish of the prints is inconsistent. There is visible banding where different features, such as holes, break up the sections of the model.

I have done:

• Belt tension calibration
• Verified the machine is set to MK4S with a high flow nozzle along with matching profiles in PrusaSlicer.
• Done both automated and manual cold pulls with PLA to clean the nozzle.
• Swapped to a regular non-high flow nozzle.
• All prints are done with the front doors open so the chamber does not get too hot.

The main difference that I can think of would be that the Bowden tube of the enclosure might be messing with the extruder enough to cause issues.

Good Printers(Factory built MK4S):

I can take any of the filaments that I just used to print on the Problem Printer, load them into other two known good factory built MK4S printers, and print out a perfect print with the exact same settings.  So it is not the filament or a drying problem. ¯\_(ツ)\_/¯

Surface Finish Banding Examples