It's the start of a new project to create a 3D-printable Furness Railway No.3 for OO gauge. This video covers the design process.

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0:00 Intro
1:10 Research
4:44 Getting Started
5:40 Mechanism 1
6:19 Bodywork 1
7:30 Mechanism 2
8:45 Bodywork 2
11:27 Creating a Prototype
13:51 Prototype Testing
17:21 Loco Detailing
19:55 Tender Design
22:41 Final Design