I bought a Campolin Zero on June 1, 2018 from BladeHQ. I have carried the knife 4 to 5 times and I have opened it only 15 to 20 times. Uses have been very light, i. e., cutting string, paper, plastic bags etc...
Now the blade will not open completely 100% of the time. It is hit or miss whether or not it will open completely.
I have checked it for any foreign objects like lint etc.. and it is clean. The blade is clean and does not appear to bind anywhere that would cause it to not open completely. I have adjusted the torx head bolts on the bolster and it did not make a difference.
I sent an email to AGA Campolin today to see what they suggest.
BladeHQ has a 60 day return policy. I intend on calling them tomorrow to see what they suggest.
I would rather have a working knife than return it.
I'll post something once I hear from Campolin and/or BladeHQ.
07/18/2018 Update. I spoke to BladeHQ today. The tech did not offer any solutions that I hadn't already tried, i.e., adjustments screws.
With that being said, I used some compressed air in a can to blow out any possible lint, sand or other foreign object that I could not see.
I didn't see anything come out, but it is working fine now.
Here is a short video after a few blasts of air.
So here's my opinion of what the issue may have been: After a dozen or so uses, a small amount of the black coating and/or stainless steel had possibly accumulated in the action which restricted the blade from deploying completely. The compressed air removed the loose material which allowed the knife to work properly.