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Oct 2015

I’ve researched this a bit, recycling is a very detailed process aparantly and not just that easy. Especially not PLA. To make things short. Big chunks need to be fully chopped up into a grinder. The cruncher is one of them found online. There are several available, all expensive for the only thing they do, grind stuff up.

Second of all, dust settles, filth settles on your old prints, and recycling a print gives lesser quality filament.

To keep things short, reheating filament breaks down the molecule structure more and more and reduces quality of the filament.

Apparanltly a ratio of 75 % new pellets and 25 % recycled parts gives a durable and stable new filament roll. But 100 % recycle into new filament is not yet done as far as i can find.

The filth is a big problem though, filtering it out seems to be a very hard process since you need to completely liquify the PLA then filter it , and then run it through an extruder.

There are so far for the moment, no good possibilities that exist today, several of the big companies are researching it though.

I had the same suspicions until I started actually doing it.(only ABS thus far)

Yes, a grinder like this is needed Mini shredder – Filamaker 2 and it is an expensive dedicated bit of hardware. I jumped right into the 90%+ better recycle ratio and I have been astounded by the 1.75mmish filament that has extruded from my Filabot. The dust is certainly present but does not effect the finished part aside from small bubbles that gas out during the moments after it is extruded from your printer nozzle. This slightly blemished finish is not a huge factor if the ABS part is meant to be functional/strong and can be fixed with some acetone vapor finish work (also strengthens) AND these bubble can be observed in some of the commercially available recycled filament I’ve used. The dust is an issue but not one worth trying to fix IMHO. Perhaps that blemished finish could become culturally accepted and sought after because of what it represents?

25 days later

Those DIY units are a good start and the most popular commercial units use the same heated screw method. However, IMHO, the main reason to recycle prints is to recycle prints. Turning “useless” plastic scraps or fails, or even single use items, back into filament with just a tiny amount of virgin pellets added. There is a potential benefit here beyond money and we are just starting to see what cultural ramifications that may have.

I have actually built a DIY one now and it seems to be working alright. The problem is i don’t have any way of grinding the prints back into pellets

1 year later

Hello everyone,

I am going to start a D.C Metro Business where all you have to do is deliver or ship me your waste filament and I will dispose of it in a responsible way. Let me know if there is interest. Please note your filament would have to be pre-sorted by ABS or PLA. My goal in the end is to make completely recycled filament for people to buy in stores and then we can keep buying recycled and keep reproducing recycled. Size of object does not matter. Hopefully this will lead to more responsible 3D printing. Please note the goal of this is not to make money but to help the environment it is Not for profit.

Jacob