yes, the ones that aren't symmetrical are still balanced. Parts are press-fit, but I suggest using glue. Depending on the quality of your 3D Printer, the internal pin may need scaling by +-1%. I suggest printing the "Tightest-Fit" core if you want your spinner to be disassembled! You do risk your spinner coming apart in battle though! 

This project contains: 24 tops, 47 spinners and 8 bottoms (that's 9024 unique spinners!)

There are large and small tops and bottoms (60mm diameter and 67mm diameter) - I suggest picking a top which matches the bottom! 

Print Advice:

6 walls, 95% (rectilinear) Infill for everything. Yep, even parts that don't experience much force. You want as much mass as possible to make the rotational inertia high. This helps your spinner stay up when hit, and also improves your offence too. You only get advantages from increasing mass with no down-sides (other than filament costs)

This model is 100% Printable with no hardware needed and no supports!

Spinner Part Selection:

For high defence - a "tank" build, use weapons which have a lot of mass, and small surface deviations. For example:

(I suggest using the wide top and bottom too)

For high-attack spinner, use weapons which protrude far from the core. For example:

Discs with more more points result in less attack power and improve defence

I suggest going for a more tanky build, as its safer and more reliable (but more boring)

Many spinners can be spun in 2 directions. Towards or against the direction of the weapons. This impacts how offensive/defensive the spinner becomes:

Some weapon discs have sharp corners, while others have them rounded. Sharp points are better for attacking, while rounded ones are better for deflecting.

The core comes in 2 varieties: I suggest printing the tighter fit piece. This core is large and not cylindrical to withstand as much force as possible. During harsh impacts, there is an immense rotational impulse (rapid deceleration in very little time). This creates large shear forces in the cores which can easily snap other design's cores in half. Cores susceptible to snapping are usually thin cylinders with screws. 

How to Print

1. Import the main .STL file into your slicer:

2. Split the single model into individual models:
    

3. keep the parts that you want and delete the rest. Then organise on the build plate. This is an example of all you need to make 1 spinner
    

4. Print the plate and good luck!