my models are bending and coming off the bed

jbz

is there a slicer / repetier setting , that will prevent bending--> bij the way it lays the infil pattern ??

as example print the infil outside to center, shape following from the outline

one line skippig and filling in later the keep the heat distributed ?

Repetier

What you have is called warping, so for more informations search for warping.

This depends on material. Slicers have a feature called brim that adds more filament next to your print for first layer, so it helps preventing warping. Later on it can be taken off quite easily because it is so thin.

You could make a heated chamber which also helps - or use material that warps less or a bed that sticks better e.g. with special glues for abs prints.