I have a M3D Micro and lately have been having a hell of a time getting larger prints to print correctly. Without a raft they tend to lift, with a raft... I can't get the raft OFF even with X-Acto knives if it has a large surface area on the bottom. Even when printing with PLA, I tend to get lifting no matter how low or high I set my temperature.

Even when I do manage to get it to print without lifting without a raft though.... the bottom is hardly flat, and sometimes even missing areas that should be filled in. Does the bottom later of a raftless printout look like this to anyone else? Is it normal that it has all these thick lines on the bottom layer when raftless instead of looking smooth?

http://i.imgur.com/9OdHWdv.jpg

http://i.imgur.com/LHBYCkc.jpg