So how does a usb stick stop you using different filament ?
It doesnt. Just counts down from "150 hours" when you run out, you cannot operate the printer anylonger other than to home, and level.

OR does it disable the printer after 150 hours.
Yes

Either one doesn't sound like ctc. They're usually pretty decent.

Very odd.

This may be a daft question - but have you actually tried to load some filament without the dongle inserted ?
Yes, I have used 4 colors now, and they all work great. Today I got a replacement ATmega1280 Board no issues without sending out the old first ( make sure it works ) and ill return the USB+ one tomorrow. New "old style" board is printing well. No issues. So I would suggest asking and VERIFYING that the one you intend on purchasing is indeed NOT USB+

Seller ctc3dprinter2014 Was A+ In Resolving the issue. Went from furious to happy. Back to making mods!