Mini 2 Under-extruding Problem

Hello all,

I have a Mini 2 that’s about 2 years old and I’ve noticed over the past few months that it’s been consistently under-extruding in a column-like pattern on any print. Besides this column of under-extrusion, the print surface is great. I’d appreciate any advice on how to solve this issue. I have attached some picture to show what is happening. Also here is some more info about my set up.

Software: Cura Lulzbot (Mac) version 3.6.20
Plastic: polymaker polylite PLA
Profile: “Standard” with no customizations