Shapeways has some nice ductwork for roofs etc.Evergreen #199 is the perfect extension. I will use it on my industry building roofs.

https://www.shapeways.com/product/LUBCBJ...li=ostatus

[url=https://flic.kr/p/2h2cpmm][/url]

That's Neat!!!

Very cool. I can think of several places I can use t- if I ever get back to the train room.

Tom

IN US (and Canada?) is https://www.rustystumps.com/hvacfittings.asp a perfect alternative. In Europe/EU has Shapeways with a print hub in the Netherland the advantage of moderate shipping cost, no tax and fast shipping.