This is a difficult print!  I strongly recommend verifying you get good bridge printing with your black and yellow filament before trying this.  

A single one of these scaled at 80% takes ~16 hours with AMS, or 20 hours for all 4 variants.  The more you print at once, the less waste there is per print!  These are all scaled to 80% in my print profile.  I feel that is a good desktop trinket size (87mm or 3.5 in tall)

Four versions of the Uranium Fuel Rod from Satisfactory.  The most game accurate is the 4x4 non-merged version.  Included is also a 4x4 merged option where the fuel rods are all merged together into one object to increase print reliability, a 3x3 option featuring bigger fuel rods which is better for smaller prints, and a 3x3 version with cutouts in the base plate to make them stackable.  Currently, their is only a 3x3 stackable variant.  If demand is high enough, I can merge those changes into the 4x4 version as well.

I used Polymaker Panchroma Matte charcoal black, Bambu Matte PLA Lemon Yellow, and Sunlu PLA Glow in the Dark - Green to Glow Green for all the prints you see in the pictures of this post.