Full details https://sudoroom.org/wiki/page/Just_enough_sketchup_to_pretend_you_can_3d_model_II_%26_Just_enough_slic3r_to_pretend_you_can_extrude_I
>From the first class.
Read the wrap up of the first class http://notconfusing.com/just-enough-sketchup-to-pretend-you-can-3d-print/