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PET is known for being pretty hard to shred. My guess is that your shredder blades are no longer sharp and the edges of the knives got rounded. Plus, if the blades get too hot after running for an extended period of time, the heat will cause the plastic to bend instead of being cut.
My advice would be:
#1 – Let the shredder rest for a few min between shredding cycles to let the blades cool off
#2 – Dissasemble the shredder and grind the edge of all knives to make a 30° cutting edge, that way the shredder will cut easier through plastic. There was a tutorial somewhere around the forum with pictures of the end result but I can’t find it right now
@snowcode seems it looks like you are not very familiar with all the processes involved in filament extrusion, I suggest you to have a look at Werbewunder’s youtube channel, that will give you a better idea of what’s involved
You can find people selling shredder plastic at https://bazar.preciousplastic.com/?category=plastics
I also found several people near Wuppertal in the Bazar, you might want to contact them as well
Please have a look at this topic, its full of ideas for dealing with plastic bags and wrappers http://onearmy.world/community/forums/topic/working-with-plastic-bags/
Understood, just keep in mind that building the machines is not like playing with lego, you need to have knowledge on welding, metalworking, power tools, and if you are in charge of the camp, you will need to be accountable for any accidents (hope that never happens) that might occur if unskilled people get hurt during the build process.
Please have a look at the Precious Plastic Map, that’s the best place to find people near you who is willing to cooperate 🙂
You will have a pretty bad time trying to take your parts out of the wood mold without destroying the parts, or the mold.
You could try curing the wood with oil, or applying a layer of epoxy resin, but molten plastic might end up sticking to the resin or the quality could be affected by the oil in the wood.
@nkhwazi It pays off if you can make a product that has local demand.
For instance, it makes no sense to make spinning tops that kids don’t want, and that you would have to sell at a super high price to try to pay off your invesment, and it would not make sense either to make iphone X cases if your goal market is a rural place or full of people who only has Android phones.
In summary, you need to define your market first, then find a product that people needs and is willing to buy, then finally think about how to mass produce that product.
Did you already obtain all the parts needed to build the machines or is that still pending? If you haven’t obtained any parts yet, I would recommend buying the machines from our Bazar
I would also recommend getting a dual axle shredder, or wait for the V4 shredder to be released this month.
This is probably what you are looking for: https://bazar.preciousplastic.com/?category=moulds&q=iphone
I think the V3 shredder can shred 1/4″ plastic, but it would be pushing it too hard, I suggest to look for the V4 shredder or a semi-industrial shredder like https://www.amazon.com/INTBUYING-M%C3%A1quina-triturar-pl%C3%A1stico-resistente/dp/B07QF7ZF7R
Haven’t seen anyone mention it yet, but TPU and Silicone are perfect for sex toys 😉
Plus I don’t see anyone making these products yet in the bazar, and making moulds should be pretty easy with a 3D printer and plaster, so it would be a good business opportunity.
I recommend having a look at the Precious Plastic map and the Bazar, those are the best places to find builders around your area
Also, on regards of the new V4 machine, the files this time should be less complex and use the same steel thickness for all parts, so you could make the parts yourself with an angle grinder and/or a vertical band saw. I’ll try that myself to avoid spending more money on laser cutting.