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Page: technics-machines-3D-printer-Granule-Extruder_en.htm
Date: 2019.10.20 00:01:01 (UTC+1)
Name: Nezo

Comment:
I just discovered your granule extruder and whow ! I'm amazed ! Many thanks for sharing what you've found so far. I really like the idea of directly feed the printer with the granules, that way you theoretically increase the number of recycling cycles. I was wondering about the difficulty of keeping a constan flow, but it seems as you said that dirt is more a problem. Well I wonder if I should just leave my recycled filament extruder project and work on direct granule extrusion !!

Me: I am also working on a filament extruder that can be fed with either new granules or with recycled plastics. It works in principle, but it's in a very early state. A first prototype will hopefully run on the Hack & Make in Nuremberg on November 2+3, 2019.

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Page: technics-machines-3D-printer-Granule-Extruder_en.htm
Date: 2019.10.09 11:41:33 (UTC+1)
Name: Ruscin

Comment:
Great project!  I learned so much about the discrete parts of the extruder.  I am creating a large format [2m x 2m x 1m] printer for small furniture printing.  Detail is not as important as speed and strength, so I am going to use a larg[er] nozzle.  Have you tried printing with a 1mm or larger nozzle?  What's the largest layer height you've been able to achieve?  Total volume output?  Thanks again, small donation on the way!

Me: First and foremost my aim is to get the extruder print reliably with a 0.4mm nozzle and 0.2mm layer height which is the standard I am using for my prints. The trouble I run into is that reusing PLA from waste prints means dealing with impurities, so clogging is what I am fighting with - a 1mm nozzle could be a solution, however I want to get more details.
Besides the direct granules extruder I am working on a filament extruder to see if impurities are more easy to handle that way.
Since it all is still in an early prototype stage, I can't give you the information you asked for, but I will see where the limits are as soon as it works as it should.
Many thanks for your donation!

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Seite: technics-machines-3D-printer-Granule-Extruder_ge.htm
Datum: 2019.08.26 10:29:40 (UTC+1)
Name: Maria

Kommentar:
Hallo Norbert,
Vielleicht Mal mit einem Schlangenbohrer (auger bit) versuchen.
LG Maria

Me: Danke für's Mitdenken, aaaaber: Diese Schlangenbohrer haben eine wesentlich größere Steigung als die von mir verwendeten Schrauben und wie im Video gesagt, ist eine geringere Steigung besser, da somit die mechanische "Übersetzung" kleiner ausfällt. Nur so kann ich problemlos den drehmomentschwachen Schrittmotor des Zonestar Druckers als Antrieb für meinen Extruder verwenden.

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Page: technics-machines-3D-printer-Granule-Extruder_en.htm
Date: 2019.08.07 22:13:16 (UTC+1)
Name: blom

Comment:
Do you have any problems with "re-starting"? After cooling down, and heating again do you have clogs? Even if you ony have the screw in the "cold zone", some plastic will stick to the screw right? Have you meassured how many gramms per hour it does? Just try to extrude at maximum speed for 30 seconds and meassure on a micro-scale. Multiply by 120 and you know what it does per hour..

Me: The screw is only in the cold zone, so there is no molten (or partly molten) plastics on it after cooling down. From that part it also works after cooling down and restarting. However, my recycled plastics is never free from contamination and that what causes clogging over time. I am working on that problem, still I have no really good solution to that.
Since it is still in the prove of concept stage of development, the maximum flow rate is not on top of my list of things to work on - be patient.

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Page: technics-machines-3D-printer-Granule-Extruder_en.htm
Date: 2019.07.09 19:20:06 (UTC+1)
Name: Louis

Comment:
Amazing job man.

It will be awesome watching you on this project.
It could be interesting if you used a vacuum pipe system to pull resin from a larger container to the extruder funnel and checking the weight with some sort of load cell to fully automatize the system. It could lower the mass the extruder has to over come.
How often do you need to fill the funnel by hand?

Me: A flexible tube with a larger diameter on top of the frame will do the job. That's how it is done in industrial printers as well. Gravity is cheaper than a vacuum pump ;-)
With the small print jobs I have done so far, the hopper was more than large enough.

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Page: technics-machines-3D-printer-Granule-Extruder_en.htm
Date: 2019.07.08 18:40:53 (UTC+1)
Name: Jonathan Hicks

Comment:
Hey there Norbert,

First of all great project! I'm hoping to try it myself soon, but I did have one question about the extrusion multiplier. When you say 7.8 in the instructions do you mean 7.8% or 7.8 times the default multiplier? My slicer measues in percent, so I got a bit confused. Thanks for putting up such an awesome project!

Cheers,
Jonathan

Me: Its 7.8 times the normal feeding, thus 780%. However, considering the rule of thumb construction you will have to do some experimentation to get the best factor for your copy of that extruder.

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Seite: technics-machines-3D-printer-Granule-Extruder_ge.htm
Datum: 2019.07.03 10:19:48 (UTC+1)
Name: Thomas Martini

Kommentar:
Hallo Norbert,

vielen Dank für Deinen unermüdlichen Einsatz.
Ich finde es Toll in naher Zukunft meinen Plastikmüll zu schreddern und einer neuen Verwendung zuzuführen.

Danke mache weiter so.
Gruß
Thomas


Me: Bitte gerne und: Weitersagen!

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Page: technics-machines-3D-printer-Granule-Extruder_en.htm
Date: 2019.07.01 20:01:30 (UTC+1)
Name: Seamiki

Comment:
Hi Mr Norbert,
is there any specific advantage in choosing a screw over an old drill bit (those for metal)?

Me: The pitch of wood drill bits is much larger, thus you have a too high "transmission", meaning you forward a too high volume of granules per revolution. Since the pitch of normal metal drills is very high, you won't be able to press in the granules at all.

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Page: technics-machines-3D-printer-Granule-Extruder_en.htm
Date: 2019.06.29 18:36:51 (UTC+1)
Name: Seamiki

Comment:
I knew it was coming.
Great as always. Simple and genius as always.
Thanks for sharing

Me: If you knew what was coming, why haven't you told me how to do it, that would have shortened my development ;-)
You're welcome!