Seems like you need to flush out the details more. Right now you have an extremely wide statement.
I think you need to take some products and really work out the logistics from there.
Some good examples of websites are:
etsy.com - for pretty much anything custom. From birthday invitations, to clothing, art and furniture.
Custom furniture, home decor, and unique jewelry made for you by the most talented makers in the world | CustomMade - Custom made furniture & decor. I cam across this one while researching outdoor patio furniture. THis may be your perfect product. I was tired of the cookie cutter patio sets at Lowes or Home Depot. The nicer sets at other stores were ususally 3-5x the cost. If looking for a wood patio set, you can hire a local wood worker/carpenter to make it for you…specially if its a modern design. Plenty of do-it-yourself plans out there. Best of all, if it’s somebody local…no shipping.
https://www.3dhubs.com/ - If it’s strictly 3D Printing then this is the place. Ability to search by region, material, etc.
https://www.ponoko.com/ - Designers & makers marketplace.
Good luck.