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Well, in this tutorial, we are going to use another program, which is called SketchUp, by Google, to do a 3D design.

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so to open the sketchup I recommend you this sketchup make because it's free and you have

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to choose a template and the more I recommend you the millimeter template because our pieces

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are always very small in order to save some money and time. Then you can see a woman,

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a person that is very easy to delete. Just click and select it and then press

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super and you can delete the person well you have a little you have in the in the upper of

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your screen a lot of tools to draw so you have to choose the rectangle tool

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and then which is here if you push here you can open rectangle and then you you

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You should click in the coordinates origin and, without clicking again, type 30 semicolon

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40 and it draws this rectangle.

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It is very easy.

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can use different tools for example this one is orbit so you can see the draw

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from different point of view also you can use zoom and also other other things

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for example here this is another tool which let you change the point of view

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then you can do this this tool which is called extruder to push pull pull the

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rectangle up and create a 3D figure like this, so pull until 10 mm.

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Now you can use again rectangle and create a rectangle in the upper side of your figure,

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create a rectangle of 40 semicolon 10 and then using extruder you can

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give the 3d dimensions pulling this rectangle until 20 millimeters and finally you can use line

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which is here. You can use line and draw a line from this point which is the medium point of this

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this line to this this point and after that again pull to create this this last

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surface if you at the end if you select this line you can easily delete you

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should save your feature just only clicking file and save as. It is very

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often that the format is the native format which is the .skp format but it is

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possible sometimes that you can export to other other formats such as STL

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format it depends the sketchbook app you you have got and it's very easy as you

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see this is the end and it's very easy and I hope it will help you to do the exercise