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Here is a video that explains how do we use a 3D printer.

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To 3d print you need to follow somo steps

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To design the figure you´ll need a program.
You  can use:
SketchUp
Tinkercard

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These are examples of easy figures:

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This is a very easy example of a 3d printed drawing.(SketchUp)

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The most common files recognised by the printer are STL and OBJ.
With the 3d designing software we save models in "stl" format.
Then we use slicing programs and generate th ".gcode" file.( recognised by the printer)