Graber i3: Fine tuning
It’s been more than two months since I got a hint on improving the edge print quality [1] from @ThantiK . Today I was finally fed up of changing the yerk every time I start a print.
So I searched for a tutorial which explains how the settings can be altered with M-codes. The explanations from the link below made my day. 
[1] https://plus.google.com/105128350515777764895/posts/HWcEdTu6s52
Marlin Tuning – Lincomatic's DIY Blog