The abbreviation etc. comes from the Latin et cetera, meaning "and the like" or "and so forth." Since and is part of the meaning, and should not be used with etc.
For the needlepoint class, bring tapestry needles, Dublin linen, scissors, and etc.
Etc. should not end a listing that begins with one of the phrases for example, including, or such as. These phrases suggest the inclusion of other things in the same class, even though they are not identified.
The electronics store has everything you need, including coaxial cable, adapters, connector jacks, wire clips, (and) speaker wirelst/, etc.
When you cannot list all items in the class, use phrases such as and so on or and the like rather than etc.