I just got my first order via Etsy. Basically as far as I can tell, it is exactly the same as processing an order yourself, just with a separate billing and shipping address. The invoice lists the customer's name and address as the shipping address, and my name and address as the billing address. I can't tell if the customer gets my home address or not on their notification. Can someone provide an example of what the customer order notification looks like?
The taxes are effectively charged twice. Etsy charges taxes based on the retail price listed on Etsy, and then Shapeways charges you a second tax on the base price of your model.
Shipping seems to be handled by just crediting $4.99 under "Value". My credit card is charged for the item+taxes+shipping. What is going to be a big issues is your end of year taxes. You will have to ensure that all charges done via Etsy are subtracted from any profit listed on Etsy.
I have my Etsy linked to a card which gives me instant notifications on purchase, however 5 hours later, and nothing has actually been charged to the card yet. It isn't clear when that will occur, or what might happen if funds aren't available, as it isn't even listed a pending yet.
Etsy lists three separate types of translations related to this one sale. Each one is marked as "Fee & Tax". So it is very confusion to figure out what items are Etsy's Cut, what are actually taxes. This transaction for example has -$1.88, -$2.25, and -$0.25 as the three listed transactions. None of them work out to 5% of the item+shipping cost.
So plan on using a spreadsheet to keep track of profits and tax claims.