Yes, I'd better go catch it!
Currently printing the 8th piece, which will be done early this afternoon. It would be more, but I had one failure when the filament spool fell over, and a long weekend out of town where I wasn't printing.
After a few tries I switched to 3D honeycomb infill at 3% instead of gyroid at 2%. It adds a bit to the filament budget, but not a lot, and the feel is much sturdier... and each block has a semi-comforting amount of infill in it. The gyroid prints make disconcerting creaking noises when you press on them. At full scale I think that's the least plastic I can get away with.
So far the fit with the pegs seems pretty good, I think the gaps between pieces won't be easily visible between wells, and it should be easy to fill / sand / paint the gaps on the outside. My current plan is to paint the outside faces and leave the rest white, since spray-painting 25 x 2.5 x 2.5 cm wells seems really difficult to do well.
The bad news: My wife realized that the diffuser is going to be very close to the door as you walk into the room, and objects to this on the grounds that it's in the way if you're trying to move about the house. OK, she's not entirely wrong...
Unfortunately this is the only place I can put it that is sufficiently far from the LP. I may end up needing to sell this one and print another, somewhat smaller QRD (or two) after this.
I think these things tend to sell for a pretty penny at this scale, so it's not the end of the world if it fails WAF compliance testing in the end.