K1 Max x-axis spring tension adjustments

Print in at least PETG or ABS or similar

I designed this model to test out various spring tensions on the x-axis to facilitate ringing adjustment tuning without making permanent invasive changes to the printer hardware that can void warranty or have risks testing and implementing. 
 

The springs protrude by about 5mm without the spring tension piece in place, so I have designed 10 different options with holes that are from 0.5mm deeper up to 4.5mm deeper than the default and with 0.5mm increments in deeper spring holes.

To generate these graphs you need a rooted printer and the necessary helper scripts. I followed these guides:

• https://guilouz.github.io/Creality-Helper-Script-Wiki/firmwares/install-and-update-rooted-firmware-k1/ 
• https://guilouz.github.io/Creality-Helper-Script-Wiki/helper-script/helper-script-installation/
• https://guilouz.github.io/Creality-Helper-Script-Wiki/helper-script/improved-shapers-calibrations/ 

My input shaping graphs started out like this: 

You can see on the left the low frequency issues showing binding on the x-axis. This apparently is a know K1 MAX issue and is the main cause for ringing problems. 

After experimenting with spring tension I ended with no springs for my printer and this result:

The article here explains the the low frequency energy problem and various solutions to  solve the problem on the top graph. 

After completing this work I managed to print a very clean ringing test piece:

The best results prior to this was:

The piece on top is with x and y input shaping applied and below is with input shaping disabled. 

The ringing test piece is available here: https://www.printables.com/model/241828-ringing-test