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very impressed with your 3D work Bonesie.
I would love to have a play with some 3D printing ( by coincidence,I did research the Ender 3 machine) but I'm not sure I could cope with the CAD files/Slicer software, etc.
How easy is it to say e.g. draw/sketch a gizmo (cover, bracket,etc.) and then convert it to a file that the printer can work with?
Do you need to be able to juggle advanced Maths !?
How about a
' Bonesie's guide to 3D printing for idiots...." 
James