ϵ=10.^-6;

RegionPlot3D[(y>(z^2) Sin[1/(z^2)]+1||y<(z^2) Sin[1/(z^2)]-1)∧x≤1∨(y>1||y<-1)∧x≥2,{x,0,3},{y,-2,2},{z,ϵ,1},PlotPoints->100,Mesh->None,Boxed->False,Axes->None]