You can't, at least, not natively...

A couple of things about ActiveX controls:

1) They work in Microsoft Internet Explorer only, so are no use at all for a
public web site.

2) You will almost certainly need to ramp the browser security right down
just to get them to work.

However, even if you were able to fill a combo with a list of local
printers, what would you do with this information? You certainly won't be
able to let the user select a printer and then somehow automatically print
to it - all modern browsers are designed specifically to prevent this type
of direct interaction between web sites and the client machine's hardware.

That's why many websites provide a "print version" of web pages which the
user can print manually if required...