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Comment Re:It can become mainstream, but not quite yet (Score 1) 143

They have fancy injection molding machines that rotate a bunch of molds under a single extruder like barrel. But I get the point.

But my point is that making a precise filament is not trivial. Neither is making mold set. But they are both similar in cost. One gets you an almost finished product, one gets you a feed stock for yet another machine.

Making my own filament would not strike me as a good use of time, especially if it's a solved problem. Uneven filaments have to lead to stuck screws and clogged nozzles.

Plastic is going to have been extruded multiple times by the time it hits the molding machine or extruder hopper. It extrudes out of the reactor where it's born.

Comment Re:It can become mainstream, but not quite yet (Score 1) 143

Printer filament will always be more expensive then a mass produced injection molded part. The filament has to be extruded, the part molded.

Also the printed part will suck, strength wise vs the molded part.

The only place it makes any sense to print 'plastic junk' is when you can print a part and extend the life of something valuable. 3d plastic printers are for prototyping.

Comment Re:Modern audiophiles are no different. (Score 1) 469

Tubes are inherently linear amplifiers (obvious restrictions, you can't be slamming the rails), transistors are inherently non-linear.

Not to get into the details of amplifier design, but much of the effort of designing a transistor amp is filtering out the hetero-dined frequencies. Filters cause their own problems.

I'm guessing your professor's Nobel was not in physics.

Tube amps have the potential to be much better then transistor amps. Real world differences are not so great.

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