Parts needed are:
Access to a 3D printer.
Clear silicone caulk
Step 1: Download and 3D Print the Mold.
Step 2: Make Your Homemade Sugru.
and added some water, lets say 2% at the end.
You can follow the steps in the https://m.instructables.com/id/How-To-Make-Your-Own-Sugru-Substitute/ instructable.
Step 3: Final Step
Shape the homemade sugru into a ball slightly bigger then the mold, put it in and leave the mold closed under pressure for two hours. After the time has passed take the ball out and leave it somewhere to cure for a few more hours. And thats it, you now own a DIYS Deathstar.