Cool thanks. I had seen something similar and had a hunch (this was on a much thinner part and was higher in the Crucible than the upa).
I’ve been experimenting with using wood chips (BBQ kind, the garage smells pretty good after this) and I have tried charcoal that I crushed. Piling on the wood chips seems to do a pretty good job though and a good bit safer of a fume (windows are definitely open either way).
I’ve also been toying with castable refractory. Made a “kiln coaster” to try and set my Crucible on to avoid sticking to the brick (lesson learned there…). A lid definitely could be cast and used though, but I’ve been trying to do everything without stopping the fire (aka opening the kiln after debind).
My thought process there is just to have enough on top not to worry about it so I can let it do it’s thing over night (this might not be 100% the best way, but my “set it & forget it” gene is forcing me to try).
My other use that hopefully will pan out is casting a large rectangular “Crucible” which can take up more of the volume of my kiln. Don’t know the downsides to this, so I’m starting small and will work my way up in the hopes if making larger prints and parts.
Finally had some time to finish replacing the extruder on my ender with an all metal one (had slippage of gear and under extrusion) so shooting for the next few days to have a solid print/sinter and video edit after that