Hello world Myself and a friend are considering building a duplicator, we'll post plans if we get it working. The frame itself seems simple enough, there's plenty of examples on youtube, but we're not too sure about about what to look for in a spindle. We want one that's decent quality and which will cut aluminium (we intend to use it to make injection moulds). Also, what should we be looking for in terms of milling cutters, chuck, power supply etc. If there's a post/guide already up here then I apologise, I did look but I couldn't see one. If not I'd appreciate any advice you guys might have.