Marlin has a Linear Advance calibration pattern generator, but I find it's hard to use because:
- It only prints the initial layer on the bed, where bed irregularities interfere with accurate reading of it.
- It doesn't do proper retraction and priming, so a mess of strings and underextruded initial segments/non-adhesion mess up the results.
- It's hard to visually evaluate.
- Getting a very wide range of K values involves multiple runs.
- It's hard to clean up.
Is there a better procedure for calibration of K value for linear advance?