This shows the unit upside down with the battery cover/mouthpiece removed and a fw4 behind it for scale.
Without packing the herb, each chamber in the tray will hold around 75% of the plant material as a fw4 capsule. However, you can definitely pack the chambers a bit more with the fw5 which makes the vapor denser and better, so a nicely packed fw5 chamber can actually hold about the same as a fw4 capsule (unpacked). On the other hand it can also do a much better job at microdosing, so is basically more versatile than fw4.
I wish I could make electronically selectable chambers, but that would be really complicated, probably impossible in such a small size with current technology and still be safe and cleanable. The way it works is that there is a heater in the overhanging section above the "mouth" where the tray goes in. Whichever chamber is aligned below the heater is the active chamber. To use the 2nd chamber in, you would pull the tray out one chamber then use. When you use the 2nd chamber, the tray protrudes ~3/8 inch. When you use the middle chamber it protrudes ~1 inch. It never has to protrude more than 1 inch in use because for the next 2 chambers you turn the tray around 180 degrees. When not in use you slide it all the way in so nothing is exposed. I think the fact that the tray sticks out during use for 3 out of the 5 chambers is a minor inconvenience compared to the huge added convenience of being able to easily load 5 chambers at once and have enough battery life to kill them all.
You can see this better in the pic above. The path is basically glass and ceramic. The heater and tray are ceramic, then there is a wide glass tube that you can barely see inside the red oring above. Then it goes into the ceramic part that you can see that has the 3 holes (in the battery cover/mouthpiece) where the vapor takes a 90 degree turn and heads down the thin glass tube to where you draw.
Unfortunately you will lose the native 14mm connectivity, but there will be an optional battery cover where the vapor will go straight down to a 14mm adapter instead of doing the 90 degree turn to the glass tube. Honestly, as I have been using this and the previous prototype for awhile now, I haven't missed using a bubbler nearly as much as I thought I would. The vapor is really cool and smooth without water.
I know you have valuable input and even though I don't directly ask for it too much, I am constantly lurking here and in other sub forums and websites passively collecting feedback.
I don't think it will be too bad because the chambers should be enclosed. However they won't be sealed air tight, so I am sure somebody with a bloodhound nose will be able to smell it.
