This is a parametric spiked surface designed for area denial so you can create your own hostile architecture.

You can change the sizes of the spikes and the base platform by editing the SCAD file and regenerating the STL file using OpenSCAD.

I originally designed this model to prevent my cat from using certain surfaces as a staging ground to misbehave. The pre-generated STL is designed to be used on an iRobot Combo MAX base; just print four of them and stick them on the top surface.