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Why we didn't have 3d printers before?
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NiHaoMike:
Funny how the Pyramids were listed as an early example of additive manufacturing. That was featured in a video that just came up about the history of consumer 3D printing.

But weren't the Pyramids built by carving stones and then assembling them? I would say an early example of purely additive manufacturing would be adobe buildings.
langwadt:

--- Quote from: MadTux on February 16, 2020, 04:17:21 pm ---Because CNC controllers from 1980 could hardly do circular interpolation. CNC from 1985-1995 could do 2-1/2D, but got really slow doing real 3d contouring with fine step sizes.

--- End quote ---

doesn't most 3d printers do everything in layers so it only needs 2.5D?

MadTux:
With buildings, about everything apart from digging tunnels uses additive manufacturing techniques. But additive manufacturing technique != 3d printing. Otherwise you could consider welding, casting, pouring concrete, assembling a device and whatnot as 3d printing, since material is added in some way.

3D printing: Work head that moves and dispenses a liquid that solidifies and forms the final object. Maybe antique pottery with sausage laying method is closest to that:
MadTux:

--- Quote from: langwadt on February 16, 2020, 04:39:19 pm ---doesn't most 3d printers do everything in layers so it only needs 2.5D?

--- End quote ---
If enough layers are used, probably yes. Leaves steps though. No steps, 3d toolpath.
mikeselectricstuff:
1) Processing power was expensive
2) Open Source wasn't a thing, so what 3D software there was, was expensive
3) Mechanical parts like stepper motors were expensive
4) The electronics were expensive, both for production and development
5) Patents
6) no internet so no community wanting 3D printing, sharing models etc.
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