I found this knurled handle file on printables by @kmarty and loaded it into bambu studio. Made some minor adjustments, and tested it on my bambu labs A1. it prints nice with all kinds of PLA. They are a bit short as pictured for my Covert Instruments genesis kit picks but still fit nice and snugly, and are not too thick. my southern specialties elephant trunks fit PERFECT. southords, multipicks, etc. should fit good too! im going to stretch out the handle when i find time and create a Covert instruments specific handle. ENJOY, and remember, you're loved!