Can other massdrop buyers please chime in? My second sample had this strong tobacco smell so it kinda masks any other smell in there. When I opened it, the stainless steel tube below the bowl was gunked up with oil that had the same tobacco smell. Now that I swapped it with the glass straw it's better but it's still there. I think the silicone piece below the bowl might have absorbed part of it.
The few times I used it before the switch, I had the impression to get a light dizziness. I assumed it was due to the nicotine but maybe some part of the device is still out-gassing?
Now that I have disassembled the device several times I have a clear view of what's going on inside. If you open the hole on the bottom lid, or say if you leave the lid opened while using the device, it will bypass the air intake path coming from the device internals (meaning you avoid electronics, metal, some plastic and possibly paint/dye and also the first silicone ring + metal if you open the lid and bypass the lid screen)
That should already be an improvement. Now if you still get a funky taste at this point, it means it's coming from the rest of the vapor path. Here we have many suspects: first there's a silicone ring on top of the bowl (cleanable), then the ceramic bowl itself might have a smell when new (as well as the nichrome wire), then it's surrounded by a layer of cotton + polymide insulation (the yellow tape) and this one stinks a lot already in the FM5 (takes many many burn-ins to dissipate, they should find something else or source it from somewhere else), then you have the large silicone piece which smells like rubber and can out-gass some while curing (unfortunately you can't remove this one to clean it because the bowl wires pass inside it) then you have the stainless steel tube (can give a slight metallic taste) then the silicone elbow, then the plastic tunnel (I think it's mostly inert but could still have some detectable smell), then the mouthpiece holder silicone (this one can be cleaned/soaked if needed) and the glass mouthpiece (inert)
Overall we have a way more complex path than in the FM5, but there's nothing really unsafe here, provided they really use food-grade silicone and that the yellow tape is really polymide. My advice is to open the lid hole, then if you feel confident you can also open the top of the device to clean thoroughly the air tunnel and take the opportunity to clean the top silicone piece. The two silicone pieces next to the bowl are more delicate to clean, but you could at least use ISO to clean them in place.
KZ's ghetto FM8 log-style DIY mod
Seing my first sample was technically FUBAR due to the glue, and after the initial test I did using the device in "reversed flow" mode, I had an idea and engaged in a small DIY mod project... Please kids don't try this at home!
- First I opened the device and disassembled the bowl holder + lid part. I used scissors to cut the silicone piece below the bowl and threw it away (it was full of glue) Be careful not to damage the bowl wires in the process.
- Then I trimmed some of the insulation at the bottom of the bowl, removing bits of cotton and some of the polymide. Production devices are built a bit differently and it's not shown on the following picture, but in the end I removed the entire external layer of cotton+polymide (there are two layers sandwiched) But you want at least to remove the part protruding below the bowl. The ceramic must be flush with the border. Try to leave some cotton around the wires as I'm unsure of what will happen if they touch the hot ceramic!
- Now using a metal saw (or a sharp kitchen knife like I did!) cut a part of the plastic bowl housing as pictured. The cut must be above or at the location where the bottom of the now exposed bowl is. Note: I disassembled the hinge and lid with the two screws and rotating the part 180° to make working on the plastic easier.
- Then I used some cotton to seal the hole leading to the electronics section (where the wires pass) as well as plug the old air tunnel (not shown in picture but you get the idea) The goal of all these operations is to ensure that fresh air will be drawn directly from the exterior via the holes on the aluminimum body. This way with the cotton we make sure no air will be sucked from the internals and the path of least resistance will be coming from the side holes.
- Now let's put back the bowl housing assembly in place. As you can see we created a nice gap for fresh air to enter by the bottom of the bowl. Note that as I said I later trimmed the polymide better such that nothing is protruding anymore, unlike in the picture:
- Now you can close the device and put the shell back, it's ready to operate in reverse flow mode! This way it's between the classic FM5 and a log vape! I use the stainless steel metal tube that was below the bowl to make a screen/cover in which I plug the glass straw when I want to take a hit:
Note that it's far from perfect as the stainless tube while of correct diameter is only a loose fit and will fall if you tilt the device too much. Another solution would be to wrap a screen on the bottom of the glass straw, but without a cover vapor will be able to escape when you are not drawing.
I haven't tested and it will surely not work very well, but using some kind of log vape stem could be another idea. But log vapes are convection and this one is conduction... I have no such stem at hand but I'll try to experiment later.
But at least with this fix, the air and vapor paths are now minimal and devoid of most of the suspects. Air is sucked by the side holes, go through the bowl (with minimal polymide exposure) and it's out! Note that even the small silicone ring on top of the bowl is no longer exposed to the vapor path.