Most folks don't know that there have been two models of DC3300 Dust Collector sold by Shopsmith; The original was very successful but had two slight problems that SS was later able to address:

1. The unit was loud due to a metal body and metal diverters inside that all the dust and wood chips impacted on their way to the bag.
2. The second issue was the impeller was prone to breakage.
   

You can bear this out by looking at the list of "Most Frequently Purchased Service Parts" on SS's website. If you happen to have one of these older units and it begins to develop a Whump-Whump-Whump" roar, you should look into replacing the impeller. It's a quick install and the replacement part comes with excellent installation instructions.

Anyway, the newer (current) version of the DC330 has a plastic body and can be easily identified by the relocation of the on-off switch from the back of the unit to the top of one of the legs. Either way, this is a great Dust Collector.