I have a few kg of 3mm filament when I only have use for 1.75mm.
How can I make 1.75mm from 3mm filament?
The best option is to find somebody in need of 3mm filament and trade them for it (either in exchange for 1.75mm filament or in exchange for legal tender with which to buy said filament).
The next best option would be to cut it into small pieces, and feed those into a filament extrusion system such as the filastruder.
In theory, making filament is easy. You take a 3mm hotend with a 1.75mm hole, and extrude the 3mm filament, let it cool, and then reel it up.
In reality there are a lot of pitfalls to making filament - if the pressure isn't even, the hole not perfect, the temperature uneven, you can end up with oval filament, filament with bubbles, or worse. If you are over temperature you may damage the filament and it could look good, but not melt correctly when used. If you reel it too fast you may thin it out more than the intended diameter, or too slow and you may thicken it. A lot of hotends use steppers, which may result in ripples in the filament, so you may end up building a nearly custom filament machine.
Resolving all these problems is probably not worth simply selling or giving away the filament to someone that can use it, and buying the right size for your machine.
If you are still interested, though, you might as well go all the way and build a full filament extruder that accepts raw plastic feedstock (usually pellets) as well as your filament, and convert it that way, then continue using it to create your own filament.
You could build a machine that has a nozzle with 3 mm input hole and 1.75 mm output hole, based on some designs for filament making machines. Or you could just cut the filament into little peaces and use them instead of the granulate in an original filament making machines.
However, as mentioned by kaine, this is very unlikely to be worth the cost/effort. Best option for you is to try to sell the 3 mm filament to someone who has a use for it, take the money and buy some 1.75 mm filament instead.
Most 3mm filament extruders have some kind of gear reduction. Many 1.75mm extruders are direct-drive / ungeared but some do use gears. What kinds of reduction ratios are suitable or optimal?
As an extension from this question, is there any reason that you would not be able to use 1.75mm filament in a printer that takes 3mm filament? I know you would have to change the filament size in the slicing of prints but would there be any other problems? Also, would using 1.75mm filament be possible if the nozzle diameter was greater than 1.75mm but less than 3mm?
Why do we have two standard filament sizes, 1.75mm and 3mm? Does it really make a difference when printing? Or is the 1.75mm just for smaller printers? In what situations should I be using 1.75mm? When should I be using 3mm?
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