I can't see it being viable, as hobby printers are very slow. I'd be more inclined to machine a simpler aluminium version without the rounded edges, and an inserted ball.
But even that is a waste of time because a cast resin adjuster using an inserted ball is already available for less than a tenner.
Also, even ignoring speed, current 3D printers aren't really suited to mass production due to printing costs.
At the moment, their primary use would be prototyping before getting an item mass produced.
Like everything there are compromises to be made. One thing we should stress is that 3D printers are
not the universal replicator beloved of sci-fi, and are nowhere near becoming such a thing. Nor are they going to replace CNC or even manual machine tools. As you say, 3D printers are good for prototyping and poor for mass production. Where they really score is for plastic objects, which using traditional methods like casting/moulding/vacuum forming/machining are not suited to small scale production. The only snag I see with that is that plastic is already used for all sorts of things that would be better in metal; headlight adjusters are a particularly relevant example.
Small 3D printers are only going to get better though; they are about where DIY CNC mills were 20 years ago, and look at how those have changed.
Then there is the combined CAD/Cam software, which as I previously mentioned is where the real improvements have been made. There are lots available from good free programs through to expensive industrial ones which make small scale and one-off use of all types of CNC machines simple. You don't even need to own the machines yourself, things like laser and water-jet cutters are huge time and cost savers for even small sheet items. I had a couple of 6mm plates for a rolling machine cut for little more than the cost of the material, and after some deburring were ready to use with the slots and bolt holes accurately formed. I wouldn't do that any other way now.
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Topic: 3D Printing (Read 2498 times)