23mm to 39mm Step Mandrels

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23mm_25mm_27mm_29mm_31mm_33mm_35mm_37mm_39mm - Step Mandrel Mandrel 4 starts at a 23mm Circumference, then steps up in even increments to a 25mm Circumference and ends with an 27mm Circumference.  Mandrel 5 starts at a 29mm Circumference, then steps up in even increments to a 31mm Circumference and ends with an 33mm Circumference.  Mandrel 6 starts at a 35mm Circumference, then steps up in even increments to a 37mm Circumference and ends with an 39mm Circumference.  Each Mandrel is 150mm High.   Perfect for Metal Model Building like Metal Earth, Piececool and other brands.  Print the even numbers one color and the odd numbers different color. Print them at a 50% infill  Keep checking back. I plan to make all kinds of tools for 3D Metal Model Building. So I will be adding more in the future.