Sentinel - Kit  - Inspired by the movie Phantasm
The sphere is 3 inches in diameter, and over 5" including blades. 
The sphere  will ship cut in half for higher print quality.
In the movie/s the sphere was able to fly through the air, round corners and chase down its victims. 
It would pierce the skull with the blades, then the drill bit would do the rest.
Now, you can have one printed and shipped for you collection of movie props.
Printed @.15m and ready to be sanded (lightly), painted and put on display.
The Sphere comes with base, sphere, spikes and drill bit. These can be glue in or not as you prefer,
NOTE: 3D printing requires the object to be fixed to a print bed. I chose the bottom of the sphere to be the print mount point. This area will need a bit more sanding (lightly) to completely smooth it out. You may notice some roughing in this area.
Image is for reference only, and may not be exact.
Found this paint to be the best chrome/metal finish for a good price. 
Krylon K01010A07 Premium Metalic Original Chrome 8 Ounce
Krylon Silver Mirror Spray Paint (Actual Net Contents: 6 oz.)
Item # 851404 Model # K09033000

RUST-OLEUM 
Stops Rust® Metallic Spray Paint in Metallic Chrome for Metal, Paper, Plastic, Wood, 11 oz.
Item # 30RK24
Mfr. Model # 7718830
Note: I/we have no affiliation with the show, it's owners, creators, writers and or actors.
Strong Warning
These pieces may have sharp edges. Please keep out of the hands of children, injury is possible. 
Not meant to be a real weapon! 
Designed to be used as a prop for COSPLAY and or conventions.
These works are licensed under a Creative Commons Attribution-NonCommercial-NoDerivatives 4.0 International License.