I made some cones to use as markers for a crawler course. These are hollow with Octogonal bases. The STL file is a single color. I used the paint tool to make them Orange with stripes and a black base. The 3MF file is for 64 cones and theyre pre colored. I left it at 64 so you can just add or remove however many you want to. 

I had some stringing between the cones on my prints so may need to adjust some settings if you want to prevent some cleanup.