This is a work in Progress still.

Update - 20 Jul 22 - Some feedback has shown that some of the "Firework adapters" can clash on the inside , and overtightening them can cause difficultly in holding the two halves of the sphere together. I have increased the size of the sphere by a few mm, latest is 106mm diameter, to overcome this.

I have left the 103mm version in this thingi if you wish to continue to use it.

This build here will give a sphere about 103mm or 106mm diameter (choose the right files) with 32 of M18 x2.5mm threaded holes for an adapter to create a spikey lighting decorations. I suggest running a 18mm tap through the holes once assembled.

I have included an adapter that will take a standard 12mm pixel bullet. You just need to print out 32 adapters and slide the bullet pixels in from behind..all the wiring is inside the sphere. Use one of the holes as a feed/ hanging/fixing point.

As I have said you can also use it as a Firework Star and linked to
https://www.thingiverse.com/thing:5200407. That page will also give the adapters that screw into the sphere for fitting the firework spokes. The firework star is a great visual prop developed by Charles Comiskey using bullet pixels. He also has done a lot of work developing fantastic Xlight models for his creation. His build video is here : https://youtu.be/p4HX2L3gwCg but visit his Thing above for the latest links.

I have printed this without supports (a bit stringy in places, but it was ok)
4mm x 10mm long pegs are uses to align the two halves. There is also an addition 3mmx10mm peg to ensure consistent alignment of the same (semi) holes.

The plastic clips keeps the two halves together. It makes for a solid fit especially when the adapters around the centre line are also screwed in.

You must print the clips with them standing vertical on their end. this ensures the clips are stronger in the director of pull across the centre line. If you do it in differently the "clip" part is not strong enough to clip into the grooves in the sphere. See Picture that shows the clip in yellow!!

Being standard metric threads I am sure there are many more adapters that can be developed to fit the same concept.