Included are a couple of sizes that you can just pop in the slicer and get going. Also I have included a .blend file with the model for more tinkering, increase - if you want a custom size, just increse or decrese the array modifiers that are in the included photo.

I would suggest lowering your print speeds if it fails, and lowering the temperature if you have a lot of stringing between the spikes.

Enjoy the model :)