5mm to 21mm Step Mandrels

5mm_7mm_9mm_11mm_13mm_15m_17mm_19mm_21mm - Step Mandrel

Mandrel 1 starts at a 5mm Circumference, then steps up in even increments to a 7mm Circumference and ends with an 9mm Circumference.  Mandrel 2 starts at a 11mm Circumference, then steps up in even increments to a 13mm Circumference and ends with an 15mm Circumference.  Mandrel 3 starts at a 17mm Circumference, then steps up in even increments to a 19mm Circumference and ends with an 21mm 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.