First Time Sharing to the community! TLDR…I have had a heck of a time having these collapsible blades catch securely using PETG and even some PLA…anyhow…I Recently got it sorted out and thought maybe someone can use this as well. I am using BL Translucent PETG and a .4mm E3D HF nozzle as any FYI. Hope this can help someone else too.