I have had great problems with this sticking to the bed, I contacted YDSIGN and they were prompt to reply, I was given instructions and different printing parameters to what is in the box, I still couldn't get it to stick, clean bed with alcohol used Magigoo and PVA glue stick on a coated glass bed, no joy. I now print with a raft, first layer PLA as it sticks fine to PLA, it prints very nicely and is supposed to be durable for outside use, not as brittle as PLA, looking good for what I want to use it for.