Difference between revisions of "Plastic recycling"

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(Progression)
(Progression)
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* 2014/01/30 - A more polished version of the metal parts will be made by [[User:noskill]]'s school polymecanics. The heated part and the nozzle will be removable.
 
* 2014/01/30 - A more polished version of the metal parts will be made by [[User:noskill]]'s school polymecanics. The heated part and the nozzle will be removable.
 
* 2014/03/10 - Received the stepper motor and the arduino motor shield. Now the mechanics will make a first prototype of the machine in a few days. Also tested the temperature sensor under "real" conditions (~200°c) and worked perfectly.
 
* 2014/03/10 - Received the stepper motor and the arduino motor shield. Now the mechanics will make a first prototype of the machine in a few days. Also tested the temperature sensor under "real" conditions (~200°c) and worked perfectly.
* 2014/04/01 - The prototype is done ! And it's not even an april fools joke !
+
* 2014/04/01 - The prototype is done ! And it's not even an April fools joke !
 +
* 2014/06/11 - The motor used is not powerful enough in the current setup. Next step is to try adding a screw trough the rotor to get more torque and eventually to buy a new motor (DC, stepper ?).
  
 
== See also ==
 
== See also ==

Revision as of 09:13, 11 June 2014

Description

Build a plastic recycling machine to make 3D printable filament for the Ultimaker and other people's printers.

First (optional) step of the process is to melt plastic parts (such as bottle caps, failed prints, packages) into plastic pellets. This can be done by putting parts inside a heating recipient having a hole at the bottom. An irregular thread of material will come out and be sliced into small pellets.

Next step is to transform pellets or plastic parts (if they are small enough) into 3D-printable filament. This is performed by the extruder. An extruder is constructed from essentially two parts: a feeding mechanism, and a heater - chopped plastic parts or pellets are fed from a container into the feeding mechanism, which then pushes the plastic slowly through the heater to create the filament.


Goal

  • Recycle failed/old prints and extruded plastic
  • Recycle other plastics, such as PET bottles (caps), etc
  • Experiment with new colors and materials

Obstacles

  • Get a filament of repeatable thickness
  • More complex = more difficult
  • Ventilation preferable for ABS

Parts needed

Part Name Description State
Tube Part where the material will flow trough. Which material should we use ? (Aluminium/ (Stainless) steel) ?

Also we will have to be able to dig holes to put the temp sensors inside.

Got ~1.5 m of dia. 20mm aluminum / 1.5mm thick
Auger Screw pushing the material Just bought one of those on Ebay
Motor Makes stuff move http://shop.boxtec.ch/stepper-motor-with-cable-p-40933.html
Heating element Gauge 28 nichrome wire

Find a way to attach this (high-temp resistant tape ?) and isolate from the outside.

Bought 3.048m of G28 nichrome wire.
Thermometers Get the internal temperature in different places of the tube (rear, middle and nose for example). PT1000
Extrusion nozzle Transforms the heated plastic into a regular filament suitable for the printer. Being machined

FilaWinder

Winder for extruded plastic. See this video for explanation.

Source files on Thingiverse, and assembly instructions here. They sell these for 159$ but seeing as we can 3D print many parts at fixme and laser cut other parts at PTL, total cost should be less than a 3rd of that.

Resources

Extruders

I'm guessing we should build something in between - not too simple but not too expensive either.

Misc

Progression

  • 2013/11/22 - Starting experiments :).
  • 2013/11/27 - Measure the temperature we can have with the current setup. Are there other ways to use the nichrome wire (on the extrusion head/on the tube/both) ? Also start experiments for the part that will transform HDPE into pellets (shattering vs melting i.e.). What's the best way to have both parts (recycling and filament making) in the same machine ? Also: plans, plans, plans - use a paper shredder to break used and new plastic into small bits.
  • 2014/01/17 - Added a metal top on the end with a 3mm brass extrusion nozzle soldered to it. Next step is adding motorization and automation (i.e. temperature regulation)
  • 2014/01/30 - A more polished version of the metal parts will be made by User:noskill's school polymecanics. The heated part and the nozzle will be removable.
  • 2014/03/10 - Received the stepper motor and the arduino motor shield. Now the mechanics will make a first prototype of the machine in a few days. Also tested the temperature sensor under "real" conditions (~200°c) and worked perfectly.
  • 2014/04/01 - The prototype is done ! And it's not even an April fools joke !
  • 2014/06/11 - The motor used is not powerful enough in the current setup. Next step is to try adding a screw trough the rotor to get more torque and eventually to buy a new motor (DC, stepper ?).

See also

Participants