My only improvement would be to put some sort of texture to improve the grip on the business end of the cutting tool. Slippery and razor-sharp are not a good match. I get the need for the esthetics and consistent design with the pen and pencil but this is a safety issue.
If I tighten the barrel all the way, the exacto blade catches the side of the barrel and won't extend. I have to loosen the barrel to up for it to work properly, and I don't see any imperfections that would cause this. Otherwise, it's a great tool that is very handy to have in my pocket.
I do cut paper illustration and have everything from x-actos to scalpels to scissors. This offers protection for the blade and is just plain smart and a pleasure to use.
As a papercut (scherenschnitte) artist I am always looking for good tools that are also easy to use, ergonomic, and bring safety to my environment. So far this knife has been a great addition to my art!
love bolt action pens, this will go well with them.
for anybody that wants to know extend the blade use pliers to be safe left turn to loosen then pull out blade'