Topic: My 3DPrint Adhesion No-Warp Solution
So I was having consistent problems with my prints warping. I have a da Vinci Mini. I print fairly large boxes, so the bottom covers a lot of bed space, and the corners were warping up. No Z-Offset variation was helping. I use blue painters tape and glue stick, and I was doing it in my upstairs office. And, BTW, it's summer here in Nashville. I mean, REALLY summer. 
I did a lot of research on bed heaters, because really my understanding was that no matter what, the problem is that the edges cool faster than the inside, and since my boxes cover a lot of bed space, the edges are very prone. My 3D printer was in a corner, and when I printed there were no fans going and I shut the AC off (I printed mostly at night, still 75 degrees upstairs). I also covered the printer to isolate it from cool air, although I couldn't completely do that because of the design of the Mini. Still too much warping, although minimum, for my taste.
Maybe hairspray or a glass/aluminum bed could have solved the issue, but then there's a lot of hacking around with the printer, and I didn't feel like experimenting blindly. Besides, I know what the issue is - inconsistent cooling, so any of those solutions really doesn't fix things - except a bed heater, and the mods I saw on that were way to complicated for me to venture into (yet).
Well, Invention is the Mother of Necessity (my version, hi Mom!) - so I invented a Occum's Razor simple solution. My garage is VERY hot these days - probably around minimum 85 in the day time. My wife (thanks honey) cleaned some of it out. So I put a small desk down there, relocated my da Vinci Mini there with a laptop, ran a print, and it looks FANTASTIC! No warping. The heat in the garage helps keep the model from too much cooling, thus it cools consistently. My surfaces are FLAT and the blue painters tape works wonderfully in getting the right blend of adhesion and ease of taking the model off the bed (love that putty knife). It's possible that the glue stick isn't necessary anymore, which I didn't mind but I didn't like the discoloration it left on my models. But even that's gone.
So, lesson learned - if you are having printing issues, stick your printer in a hot room.
I'm a happy man. I do find it curious that the Mini (and migosh, other more expensive models) don't have heated beds. I'm sure it's to bring down the cost, but that's like selling a car for cheaper by omitting the brake pedal. But, really, in the end, it's really the da Vinci folks own recommendations that helped more than the Internet - in a way. I like this forum but there's too much talk and not enough information. Still, though, thanks for those who helped me.
