I have the third generation tip; the first tip to be manufactured in-house at Dynavap and the first tip to feature grooves for various screen position.
My tip can accommodate the following loads of Super Lemon Haze, stored with a 62% rh bodeva pack. This is according to my scale so it could vary +- depending on other more accurate scales and the amount of moisture in your bud.
Screen in bottom groove - .07 grams
Screen in middle groove - .05 grams
Screen in top groove - .03 grams
These are the absolute max amounts that I can stuff into the chamber. In practice, I never fill the Vapcap to capacity. I like to pop an unground nug in there and let it float freely. My average load is .015 grams, just a tiny nug. I vape several times per day.
Obviously I microdose and absolutely love the effects! The highs are cleaner and far more enjoyable compared to a heavier dose. It took some effort to get down to lower doses, but if you load a tiny bit less each time, a tiny bit less, you may find that you get just as high but a cleaner high with far less weed.
The Vapcap is not only fantastic for microdoses, although many use it with larger loads. The other benefit is that the Vapcap is astonishingly conservative with your weed.