A randomizer blueprint is a special type of Cubie Blueprint which has a single recipe but can generate one of multiple different cubies.
You won't know what cubie your blueprint will give until you place it into the Printshop.
As soon as you place it in the Printshop you will see "Currently Printing ____ Cubie" and at that point you will know which cubie you will receive once printing finishes.
List of Randomizer Blueprints
Cat Cubie Blueprint (9 Variations)
Tiki Warrior Cubie Blueprint (27 Vaariations)
Flight Attendant Cubie BP (3 Variations)
Pilot Cubie Blueprint (2 Variations)
Ghost Cubie Blueprint (2 Variations)
World Cup Cubie Blueprint (32 Variations)