One of the smartest investments i've made since starting to vape is fill. First i tried the teabags, big bag of pillow stuffing, on and on and on. Then i noticed at Liberty cig's, just changed their site but there's a link to it, that they sell sheets of fill at the right weight for whatever cig. they carry. For 1.99 (or 2.99) got a sheet that will last me a year, that lets all the juice get used - ALL of it! They only carry the 4075's but it works just fine with the 901's.
No more adventures into frustration and clumsiness. They have nice instructions w/it and you can vary until you find what works for you. Beats the heck out of the factory stuffing and it's just so easy. I don't dread re-stuffing my carts anymore at all.
Just a suggestion, I have no ties to them, just couldn't believe what a change in my attitude and frustration it made.
Marian