I bought a sheet of BuildTak about the same time I bought my sheet of PEI. The BuildTak is adhesive-backed, so you’re kind of committing to it for a while when you use it, so I thought I’d try the PEI first. The PEI works very well, but I had a few long ABS objects that lifted and warped with the PEI. Maybe I needed more experience with the PEI, but I didn’t want to waste any more ABS, so I decided to install the BuildTak.
With BuildTak, it’s much easier to get a print to stick. In fact, it’s easy to get a print to stick so well that it’s difficult to remove. You need to follow the directions with zeroing the height, and practice a bit to get just the right amount of stick. Those long ABS parts stuck well and came out perfectly flat.
I used BuildTak for several weeks, and I wanted to see how long it would last, to see if I could justify the price. I put a few dents in it while removing some pieces, but I never tore it like I tended to do with the green PET. Also, the BuildTak is much easier to apply and remove than the PET. I carefully applied the BuildTak, and I didn’t get any air bubbles at all, so I didn’t even need to use a card to smooth it out, as suggested by the instructions.
After several weeks and maybe a few dozen prints, I noticed that there seemed to be a bit of ABS stuck on the surface that I couldn’t remove by scraping. So I dabbed at it with a rag with acetone to try to clean the surface. I totally forgot that you’re not supposed use acetone on BuildTak. I put a nice glossy shine on the surface where I was cleaning it, contrasting with the satin-like normal finish of the BuildTak. Then I remembered. OOPS.
So then I removed the BuildTak and went back to my PEI sheet. Removing the BuildTak was also much easier than removing the PET film.
I mentioned my PEI usage on a PEI thread here https://forum.lulzbot.com/t/additional-accessories/117/1 but the thing I like about it is that I have a thin 0.063 sheet that I hold down with binder clips. After printing I can easily remove the PEI and flex it a bit to break the part loose. This is a great advantage, and I’d like to try something similar with BuildTak. I’m thinking of getting another BuildTak sheet and maybe a 0.063 sheet of cheaper plexiglass, and adhere the BuildTak to the plexiglass. Then I can try removing and flexing the BuildTak to break parts loose. If/when I get to this I’ll update this thread.