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I would love to re-use my failed prints by re-extruding the plastic to be used int he 3d printer once again. One thing that stand in my way is finding a effective way to shred the plastic into smaller bits for the extrude to use. What is a good thing to look for to accomplish this? Maybe a really big 'paper' shredder?

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    $\begingroup$ LMGTFY produces several pages selling shredders and tools which re-extrude filament. $\endgroup$ – Carl Witthoft May 14 '18 at 13:44
  • $\begingroup$ form what i've seen in youtube/forums it's not worth it. Making filament is hard because you have to nail the temp, extrusion pressure+speed, support the soft hot wet filament without drooping (which warps it) or sliding (which flattens it). Any variations in temp or speed will screw up the diameter. Any variations in scrap density will affect the temp and pressure. It's as complicated as nailing prints. Then you need to consider the effect that skin grease, dust, and other debris has on layer adhesion and uniformity. All in all it's not worth the time, equipment, or labor, at least not yet. $\endgroup$ – dandavis May 22 '18 at 5:48
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    $\begingroup$ @dandavis You have a vary valid point, which is why I am still looking at doing this. I just watched some videos myself and it is indeed difficult from what I have seen. I just can't wait for something to come out that is simple to use and produces usable filament. I just hate not being able to re-use failed prints and knowing I could turn soda bottles into usually filament sounds great, but like you said its costly, time consuming, and difficult. $\endgroup$ – Ljk2000 May 24 '18 at 3:47
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there is a project called precious plastic and there is a plastic shredder, but it is a rather expensive solution.

As I am waiting for parts for my Lyman extruder, my plan is to hammer the parts and then process in old kitchen robot with steel working area, an example here

The paper shredder will be ok as long as you can feed it with plastic.

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  • $\begingroup$ I looked at the plastic shredder and darn it is rather pricey, but does look effective. I might do something similar to what your talking otherwise, for I don't make enough waste plastic to justify buying such a tool. But thank you for sharing that with me for it is a neat product. $\endgroup$ – Ljk2000 May 14 '18 at 14:12

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