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03/08/2020 at 08:13

Hello everyone,
In case extrusion screws run out of stock in the bazar or unavailable in your country, I found a supplier who provides extrusion screws, barrels and other accessories.
They both have 588mm and 790mm sizes.

Here the links :
588mm set (screw+barrel+nozzle or just separately)

790mm set (screw+barrel+nozzle or just separately)

Also a nice post to make your own filament maker :

TO precious plastic team : You can delete my message if you think it is not appropriated to send it here. I don’t advertise anything, I just want to help people to find this famous screw so difficult to obtain.


18/09/2019 at 10:02

@thegreenengineers, thank you for your interest, hope to see some explanations about my questions A,B,C.
@s2019, thank you for your answer, if I understand well, you mean it is better to keep the bicycle rim empty inside and just put the weight around. Is that right?
If yes, for sure I can keep the original rim. Easier.
Then how should I put the weights ?
Distributed in a balanced or unbalanced manner?
If unbalanced i will not put the weights all around.
Continuously or discontinuously?
If continuously, I can fill the inner tube of the tire with concrete.
If discontinuously, I can fix some weights 1kg around following your way.
A quick sketch could be very useful for me.

Below a link to the new inertia flywheel using concrete (which is very good in compression and not good in traction) enclosed in a shell.

And a link to an interesting machine : the pedal powered mill

16/09/2019 at 13:57

Hi @thegreenengineers,
I would like to continue the idea Katharina started.
Hope you can see my message.

A- So you confirm that a flywheel with a gym 20kg cast iron lifting plate would be enough?

B- I also want to have the shredder in front of me so I can put some plastics during I do exercises. And also higher, so I will need to have a second set of sprocket and chain. Could you tell me which diameters should I use for the wheel sprockets 1,2,3? I know that there is some rule about small then big to get better torque. But with 3 sprockets I don’t know.

C- I will cut the rear frame and keep the whole shift mechanism to mount it to the front, so I could increase the speed progressively. Do you think it is necessary to keep the shift mechanism with all different diameters of sprockets?


09/08/2017 at 23:33

It’s seems to be extrusion, but steps behind i am not sure.
Anyone have an idea about how they keep a similar grey color each time?
Seps before extrusion?

09/08/2017 at 13:48

Conceptos plasticos already do this :
I am searching about the process

08/08/2017 at 10:43

To not waste time at keeping shavings, I saw my friend use a vaccum plugged on the cnc milling machine when is running 😉
A clean bag is better before start with a different material in order to separate materials.
Keep going,
Looking forward to hear news

In reply to: Surfboard fins

07/08/2017 at 04:58

Just before compression, you could try to add carbon or glass fiber stringers (in the same time as the bolt insert (depend of you mold))
I think it’s a nice idea, and it needed to be tried to be sure it doesn’t work.
One hard part is the mold, i would be interrested to help you as i work already with molds for others products and i like your concept.

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