Rectangular Pattern: Repeats chosen options or bodies a provided amount of periods in rows and/or columns. Autodesk 123D: A group of cost-free applications and packages intended to make 3D structure effortless Tinkercad: A very simple, free of charge on-line CAD software meant to produce and print 3D content SketchUp: https://brooksumzkv.luwebs.com/20730251/the-2-minute-rule-for-3d-modeling-tutorials