Always had issues with the flatnesss of my K2 Plus bed. It came with a *w* shape with a delta of over 1.3. Got it down to . 5 with manual leveling. That, coupled with z offset issues, made my first layer a difficult time. It was unreliable at best, even after manually leveling. My best result was a frowny face. Enter r3men graphite bed. It is, very, flat. Before and after attached. Now I get a solid foundation for the work I'm doing. They include a sanding block of you really want to chase flatnesss. If you have the means, and need more precision (me for abs lab equipment).. I suggest this bed for sure.