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Having a dedicated shredder is the main reason I can't fully recycle my failed prints. Hopefully I'll be able to build one some day. Great content as always guys! 👍

ok, so some suggestions from someone with millwright training here, take with a grain of salt but these may help a touch. First off, great work on the design, my main worry here is those standoffs will be a bit weak for that steel shaft coupler. The aluminum one should offer plenty of torque, while also helping with any shaft misalignment and providing a place for torque to go if the shredder ever jams. Think of it as a sacrificial part like a shaft key, as it's probably easier to source another coupler than a new shaft, motor, gearbox, or blades. This will be important if you ever want to try aluminum or other softer metals in the shredder, as having that thing bind up could grenade that gearbox or burn out your stepper. secondly, if you haven't, it may be worth it to try hardening the blades, then tempering them. There's a lot of videos on how to do this, and one of those 3d printed foundaries you made should be able to get up to temperature, but word of advice: if quenching with oil be extremely careful of flare ups. I've had a quench tank throw 4 feet of fire on me before because tom the 200 lb shop monkey decided to put some light oil in there thinking it was a dump tank. i'm glad i was wearing safety goggles, and remembered not to gasp at the fire in my face, because i had no facial hair for a while after that. after hardening you can temper the steel using a regular oven. If you take the time to sand down the cutting faces to have sharp, 90 degree corners on the edges that cut before hardening you'll also make the motor's job easier. Plus, then you can use this to shred softer metals for use in the foundary. Third, as a safety, convinience, and quality of life thing, I'd suggest building a stand, feed chute, and catch bin for the shreds. wood would work well for that, and save you some time/cash on materials. the reason for the feed chute is to keep things from flying out of the shredder, and with a chute you can pop a bunch of stuff in at once. the chute should also be longer than your arm is, because even that little shredder will turn your hand into ground beef if you don't have a real fast way to remove power from it that can be activated with one hand. I had a co-worker who lost fingers to an industrial shredder because he was faffing about testing it and had the feed chute off while doing repairs. a moment's inattention and suddenly he was in too much pain to locate the emergency shut off button. Don't pull a dave, he's constantly throwing up a shaka whenever he waves as he's missing all but the thumb and pinky on that hand. As for the catch bin, that's just there to make your life easier. just have a few bins for the various materials (could even just use rubbermaid containers or something like that here) so whenever you need to mold a part you can just grab the bin instead of having to set up the shredder. personally i'd run down to a kitchen supply shop and get some camwear food storage containers with lids, but that's just cause they are some reasonably tough clear containers, and the lids are pretty good at staying on unlike some of the junk you can find at walmart. depending on your printer's size you could even print some containers, but they'd probably not be clear. Lastly I cannot recommend some kind of e-stop or dead man's switch on this, as i said earlier a shredder will turn people parts into mincemeat with ease, and even one as small as yours probably has the torque to chew through bone. All industrial shredders require an e-stop or dead man's switch in the safety regs, and all safety regulations are written in blood. People have died to these things before, and running a hand or appendage through a shredder is an excellent way to require amputations. There's no way to save a hand/finger/etc that's been messed up by a shredder, and any clothing that catches in that thing WILL pull you into it. I watched a guy's tie almost drag him face first into a thickness planer because he wasn't paying attention around the woodshop, I'd hate to hear about an accident with this thing, and homebuilt tools like this still need the safety features as you're still taking the same risks running the thing. Remember: that thing will destroy anything put in it and it's gonna hurt the entire time it's happening. this thing doesn't run very fast, so it's gonna hurt. A lot.

The idea with the aluminum shaft coupler is that it uses a flexure to hold on to the shaft which is much stiffer and stronger than a set screw. Also, it allows for a bit of axial misalignment because otherwise any misalignment will force the shaft to flex at every turn and makes it harder to spin.

you may want to keep the aluminum coupler or make one that is weak enough so it would fail before the motor does because should the machine become overloaded by something too hard to shred you wont burn out the motor or more over the controller. you may want to build some kind of box on top so you can feed stuff in safely because there is nothing stopping the blades from tearing up a hand that gets in the way.

Place Shreddy 2.0 underneath Shreddy 1 and you have the best of both worlds :)

every project you made really inspiring me. This is what i need to recycling every plastic trash in my neighborhood. Your channel is really worth to follow. Thanks dude

Very nice design! Looks like it should now be combined with a filament extruder that actually works. But based on what you have shown so far, I'm pretty sure the filament extruder you are going to build would also work pretty well :)

Wait, you can 3D print molds for injection? THIS IS AWSOME!!

Having a personal shredder like this would be amazing to recycle failed 3d prints, just shred them back down and melt them back into filament! A personal self-sufficiency dream of mine

Good work! I would add a funnel on top of the blades for safety and also so bigger items wouldn't fall off. Also container below to collect the shreds. Amazing in combination with the injecto!

Being able to recycle any plastic on demand is going to be a blast!

This shredder looks awesome, I'm looking forward to parts becoming available!

This is incredibly well done and pretty much exactly what I want to make some day. How did you decide the diameter of cutters to use? It seems like there's extra metal there that doesn't really anything because the cutting is happening at the outside edge but maybe I'm missing something

I like your shreddy design, the One thing I'd change is to do what the majority of commercial shredders do, mirroring the orientation of the teeth at the halfway point, so that if you were adding them on one rotation point clockwise each time, once you're through half, add the rest on one point counter-clockwise from the last instead. Basically, you want your teeth to converge towards the middle as they rotate so that you have an area with concentrated force.

That Design Looks pretty Solid. Nice Job Guys!

Fun, I was looking for DIY shredder for a different application (creating smaller cuts for garden composting). Nice video, gave me a good idea!

This is exactly what I’ve been looking for to shred old prints and bottle caps to make recycled filament.

Definitely worth looking into ‘precious plastic’ movement if your into recycling your plastic prints / scrap .

this is a totally cool idea. too many wasted and failed prints in my life

Seems like this would work perfectly to shred a lot of cardboard as well.

You're announcing the giveaway on my birthday! How Exciting!

I really appreciate what you guys are doing, It's very inspiring!

Was about to comment about motor choice before you brought it up. I see so many people use stepper motors for things they aren't good for simply because it's the only motor they know how to work with already. But you actually gave a really cool reason for choosing a stepper. You got my like on that alone.

This is awesome! Been waiting for a plastic shredder to enter the market

Most underrated channel

This is a fantastic solution. Being able to recycle plastic is great thing to do.

This thing is pretty sweet. I’ve been wanting to make one of these for years. Thanks for making this !

Wow! Another impressive video from Action Box! With how much plastic waste there is in the world, this project is truly an inspiration, and I cannot wait to see how much recycled plastic can be used to make useful items in the future!

I don't have a printer, or a need for this but, I think it's really cool and I'm glad I watched! I'll be back for more! (Thanks KZfaq algorithm!)

When I can afford it I was planning to make a large version of this for shredding my households plastic waste, making it more compact and possibly preparing for hydrothermal liquification, gassification, recycling etc :D cool vid, happy to throw my name in the hat

Another great design from Action BOX! You're building an impressive portfolio for your brand. Looking forward to your next video about 3D printed molds.

That would be so handy for all my failed prints! would love to upcycle them

Shredii is awesome! Can't wait to see the results going forward.

I could use shreddy for many projects!

You guys keep making fantastic devices and YT content! If you end up making a device to 3D print using pellets that is better than other pellet extruders out there, that would be sweet! Thanks for sharing all your hard work with us!

Awesome! Would love to see if there's a way of sourcing used skilsaw blades and using them for this!

If you're just wanting to recycle HDPE using other molding methods, the bigger chunks from the first version are probably sufficient. But for what your goal is here, the smaller chunks are probably easier to deal with. Fun experiments! Thanks for sharing!

Poor Shreddy 😢. Runs for 5mins, and is made redundant when Shreddy2 comes along and steals his thunder.

I'm loving this channel! Fun, on point and useful

I think everyone with a 3D printer should have a shredder too!

Might be a good Idea to add a mech under the shredder to controll the chip Size. Stepper online also has real Servo Motors available. The downside of using Steppers is that they only have good Torque at low RPM. If you Chose a real servo Motor (which is Controlled exactly Like a Stepper) you get way More torque at Higher RPM thus using your 50/1 Reduktion gearbox More efficiently.

Having worked in injection molding for years, I can add a few tips here for shredding. Be sure when you are grinding bottles, to pull off the label, and also the small cap ring if you wish to reuse the plastic. Also make sure your bottles are clean, and that there is no dust or wood shavings or any other particles on the surface your shreds fall onto. You do not want any contamination in your regrind that would show up in your project. Try to grind the same kind of plastic in one grinding, and clean the grinder teeth after each type of plastic is ground. Some plastics will not mix with others, and it’s the same with colors. If you don’t care about the color of the extruded plastic, colors can be mixed, but if you want a dedicated color, try not to cross contaminate. Using 100% regrind is not really recommended. It can cause balling up of the material in the plunger or screw feed. Try to mix at least 30% virgin into the regrind. Plastic does degrade over time. HDPE and LDPE is not so bad, and can be used for quite a while, as long as not overly contaminated. Some specialty plastics lose integrity the more often they are heated. You can also add color concentrate pellets or dyes to the clear plastic if you want a specific color, and you should be able to find those at a mill supply store.

I would give Shreddy a good home :)

Awesome. It's far better than my document shredder.

This is so cool coming full circle on the making of stuff

Sweet project I like the shredder!! I do have an idea instead of the teeth spiraling off to one side offset them so that the spiral meets in the middle centering the pieces instead of pushing them to one side of the carriage.

Una maravilla de proyectos. ¡Felicidades!

Hey, Amazing Idea guys, and extremely well-executed, I'm one of the people who commented on the suggestion of using a plastic bottles (PET bottles) in the last video and I must say I'm impressed although I have a few suggestions as well, they are as follows: 1. Make a transparent top cover out of acrylic or plexiglass, mainly for protection from projectiles, and secondly to act as a hopper to shred material in bulk. 2. I think you might already know but still I would like to mention to not mix 2 different plastics together as they might degrade the performance of the material (eg: bottle cap and the bottle both are usually made of different materials hence their melting temperature would also be different) so just for ease shred and store plastics in different containers. 3. Just an addon to point 2, even 3D printing PLA might have different compositions and stuff so shred the same brand of plastic together. 4. you can use the aluminum shaft coupler for this purpose as the torque will be within tolerance (at least for plastics) and would be recommended as it would rectify any misalignment issues. for metal shedding, you can proceed with the custom coupler. Well apart from all these recommendations the project is pristine, and the quality of both the video and the product was outstanding I can make out these things are made to last so kudos for that. Overall the best looking forward to the SHREDII V3. Love from INDIA 😊👍

I’ve saved every bad part scrap and support piece since I started printing

Now I just want to watch it for 2 hrs shredding things

This has been on my to-do list for a few years, I'm just a few steps behind.

Once again guys sweet and brilliant. This is the best shredder that I have seen so far.

I need SHREDII got soooo many Platic bottles to deal with for him regularly... he will be well fed.

Nice design!

How have i survived without this Machine?

If you stack the blades onto the shaft in a V form they would funnel the parts into the center, instead of walking the parts to the left. Not as noticeable on the second version with smaller teeth, but might have helped with the first version.

Super cool this is one of the only "attainable" shredder I've seen.

wow... this is what i'm waiting for a long time ..... great job.

you guys are bringing the goods once again :) cant wait for the injection machine to be done

this is the type of thing that needs to be scaled up a remarkable set of possibilities can percolate from such things

Oh that's wicked! I so need a shreddie to handle all my 3d printer rubbish. I usually sit there with industrial scissors and cut as much as I can up to put into silicon coaster moulds and melt the different coloured plastic in the oven 😀 Shreddie would really speed things up 😂... Well done guys

Cool wish i could have one im experimenting with machinable wax at home rn

This one is much usefull for recycling ♻️

This is very resourceful. It’s cost effective and recycling is always a good thing. Reuse and no waste. Awesome.

Our Stem class at our small schoolcould really use a small shredder like this. We have a large moving box of failed prints.

Nice. Yeah a 3d print pellet extruder that does shreds would be sweet.

Yeah, the problem here as well is i dont have a dedicated shredder, and getting the parts and metal for it here in Arizona is almost next to non existent, OR 10x what it should cost honestly cause it is 'custom parts' IF i wanted to get it all done in a SHOP and WILL NOT SELL ME THE SHEET METAL ALONE...smh... horrible in this day and age. I appreciate you guys making this and giving ideas on how to complete a project like this, thank you.

It very well build

what a cool project! Had to be sweating it out before you had it assembled for the first time. We have come a super long way from the 70's when I started my first shop in my parents basement - I could not even dream that we would have 3D printers, lasers, home made shredders, and more all in out own homes and not for a ton of money... that is subjective but I got my first 3d printer for $100 so shoot, that is truly affordable for most of us.

Cool build!

Awesome invention guys

I find your videos very inspiring please keep it up! P.s If you want smaller pieces of plastic then put a sieve under the shredder.

Very nice and similar to the Precious Plastic one!! Keep up the good work

You guys make amazing videos, I always love seeing new ones in my feed :)

Brilliant Video and great build for the shredder. I wish that one day I have a machine park like you. Currently I'm working on my own injection machine so I can't wait for the video of the injecto 2.0.

congratulations for such an amazing creation

I love when DIY videos start with: "Let us begin by going to our handy dandy CNC machine, which of course, everyone everywhere has."

Wow, this is nice! :D I can see this being used to make your own 3d printer filament. also thanks for the small Arduino tutorial :). Also, you should try making an affordable 3d printer filament extruder to make your own printer filament. Great video 👍

Having a dedicated shredder and injection would be amazing to save on the kilos of failed prints I have

Brilliant idea! Excellent job guys !! Love your channel.

What a great project. You know there are lots of "green" sponsorships out there. If you could build this project to run of a renable source. Ect solar/wind. Your recycling without a carbon footprint for production of "usable mechanical parts" on a personal scale or more. I'd like to see that and see it sponsored. Have a good one.

물먹고 페트병 나오는게 상당한데 그걸 재활용하여 3D프린트를 하다니 아이디어가 상당히 좋네요.

Great idea and product

Gettind a shredder has to be the hardest thing. Making an injecting molder, making molds, 3D printing. All have their difficulty. But I can't solve the shredding issue. :(

A two stage shredder might also work with v1 on top and v2 below. The first one does the initial cut and the second one reduces it to fine material. You could run them with a chain so one motor could do both stages.

Amazing high quality content as always! Is all the shredded plastic usable in injekto or do you have to pick some pieces out? Would be great to have it feed straight in

This is super cool. It also seems very scalable.

Dang, this is so cool! perfect for gears!

i built one of these on paper several years ago. interesting similarities

Great work. Maybe consider adding an Estop button near the shredding area.

I've been slowly starting to save my 3D printed leftovers.

That is a beast!

Very impressive.

Looks great!

I want one.

the resin from shredi 2 looks a lot like what we get both from the grinders at work the the regrind we buy at work

Excellent work guys 👍, Love you!

love the shredder! great project, can't wait for plans to be uploaded. want to build one myself for all my wasted filament projects. also I working on building a filament re-cycle r to make my own filament.

Very, very interesting video. Thank you. Love the recycle idea.