28

There are a few options. Machines are available which grind the used plastic into fine pieces, melt it down, and extrude it as filament to be reused. Filabot is perhaps the most well known. Depending on where you live the local recycling programs may accept PLA or ABS. They will then shred it and melt it down for reuse. PLA is bio-degradable so you can put ...


8

Quality depends on 3 things: Quality of pellets (purity, fillers, color) Where/how they are stored before and during the extrusion (humidity, contaminants) Have a filter in your extruder to get rid of random junk and air bubbles ending up in your filament (250 micron wire mesh filter) There's no secret formula the filament producing companies have, they ...


7

In theory, making filament is easy. You take a 3 mm hotend with a 1.75 mm hole, and extrude the 3 mm (sometimes actually 2.85 mm) 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 ...


6

The normal way pigment is added to filament (or any other extruded plastic product) is by mixing "masterbatch" pellets containing a high concentration of dye with the raw resin pellets. (https://en.wikipedia.org/wiki/Masterbatch) This is significantly easier and more reliable than trying to mix raw pigments into the plastic -- the likelihood of clumping and ...


6

In principle, it should work fine as a filament, since it's used extensively in the plastic extrusion industry, but I don't think you'd get great material properties out of it. ABS and HIPS incorporate polybutadiene into a graft polymer structure for a very good reason: the butadiene sections in the long molecular chains kind of "stick together" as a ...


6

If you're more interested in the recycling and reuse aspect than the re-print aspect, you could melt all the scrap filament onto a cookie sheet or into a bar (like in a bread ban). You could then manually work the material, or use a CNC machine to carve out your next thing. This Youtube video refers to HDPE, but the same concept will apply to other ...


6

You can basically use any machine that pulverizes your pellets into small pieces. One guy on 3dhubs, explained it in details. My conclusion is that you can recycle everything using this data gathered from research up in link there. Also, you can use any plastic material and pulverize it into pellets (even from the bottles) and you can try to do this ...


5

Producing own filament is a challenging task. I see main pitfall in producing filament so it has same quality as you get in shop. You have to: constant round-shape diameter diameter tolerance ±0.05 mm avoid bubbles and other defects avoid object in filament (depends on pellets quality) store pellets properly (high humidity is a problem) Additionally you ...


5

The best option is to find somebody in need of 3 mm filament and trade them for it (either in exchange for 1.75 mm 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.


4

Some general comments about the process used (plastic extrusion): The plastic extrusion process is not simple- many textbooks dense with equations have been written about it. The lowest cost industrial extrusion processes do not use pellets at all- because pellets have already gone through an extrusion process so they are more expensive than powder resin. ...


3

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. There are some open designs for such machines you can build, or you could buy one, ...


2

OK, it just turned up on Thingiverse that someone has demonstrated a trivial machine to do exactly what I asked for: any FDM printer. Its sounds crazy, but it works! This technique will allow you to create one offs, and to color match your 3D-prints. It works by changing the filament (and the color) of your filament while printing, and this causes a multi ...


2

I do my own filaments and its pretty simple. The real key for quality is stability of everything. The temperature, the movement of the air around cooling part, the extrusion force, both internal and external. It is funny to watch how I have several atm pressure inside my extruder, yet the gust of wind outside the room changes the outside pressure enough to ...


2

Filament manufacturers (for example, Colorfabb) also sell pellets, price per kilo would be about 10 times less than the same plastic in filament form. Out of household garbage only ABS can be easily extruded into filament with Filabot-grade machine. PET AKA plastic bottles looks promising as well. You can also use certain products "off-label". For example, ...


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