Overview:
This is my version of machine to recycle PET bottles to filament for 3D printer.

Here you can see my setup with two units in operation.

Bill of Material:

• Base
  • Plywood 150x600mm (one unit)
    
• Spooler
  • Body
    • 1x Spooler_Side_Right.stl
    • 1x Spooler_Side_Left.stl
    • 1x Distance_Top_Back.stl
    • 1x Distance_Top_Front.stl
    • 2x Distance_Bottom_Mount.stl
    • 2x Bearing 625ZZ
    • 5x Screw M5x100mm (flat head)
    • 4x Dome Nut M5
    • 1x Nylon Lock Nut M5
    • 5x Washer M5
    • 4x Screw 4x25mm
  • Motor
    • 1x Gear Reduction Motor with 8mm diameter and 25mm length D-shape shaft, 6 or 10 rpm, (i.e Gear Reduction Motor - Package A)
    • 1x Gear_17.stl
    • 1x Set screw M3x10mm
    • 1x Nylon Lock Nut M3
    • 1x Motor_Mount_Front.stl
    • 1x Motor_Mount_Back.stl
    • 4x Screw M3x10mm (flat head)
    • 1x Motor_Mount_Lever.stl
    • 1x Motor_Mount_Connection_Rod.stl
    • 2x Screw M3x6mm
    • 1x Screw M3x15mm
    • 6x Washer M3
    • 1x Nylon Lock Nut M3
    • 1x Motor_Cover.stl
    • 4x Screw M3x6mm (round head)
  • Spool
    • 1x Gear_55.stl
    • 1x Spool_Cylinder.stl
    • 1x Spool_Side.stl
    • 16x Screw 3.5x20mm
      
• Cooler
  • 1x Fan_Holder_5015.stl
  • 2x Nut M3
  • 2x Screw M3x25mm
  • 4x Washer M3
  • 1x Fan 5015 (i.e. 5015 Cooling Fan)
    
• Heater Block
  • 1x Al block 30x25x38mm (see Heater_Block.pdf)
  • 1x Al plate 30x70x8mm (see Heater_Block.pdf)
  • 1x Nozzle drilled 1.7mm
  • 2x Screw M6x90mm (M6x100 shortened to 90mm)
  • 4x Nut M6
  • 4x Screw 3.5x20mm
  • 1x 50W Cartridge Heater (i.e Cartridge Heater)
    
• Strip Director
  • PET_Strip_Director.stl
  • 2x Screw 3.5x20mm
    
• Control Box
  • 1x Control_Box.stl
  • 1x Control_Box_Back.stl
  • 1x Motor_Controler_Enclosure.stl
  • 4x Nut M3 Nut
  • 4x Screw M3x10mm
  • 4x Screw 3.5x20mm
  • 1x Thermostat with K type thermocouple (i.e. Thermostat). The termocouple should M6 mounting screw.
  • 1x DC Motor Speed Controller (i.e. Speed Controler 5A)
    
• Feet
  • 4x Foot.stl
  • 1x Foot_template.stl (if you want to predrill the holes for screws)
  • 4x Rubber pads 40mm diameter
  • 12x Screw 3.5x20mm
    
• Other (Optional)
  • 4x Corner_Protector.stl
  • 4x Screw 2.5x12mm
  • 1x Handle.stl
  • 4x Screw 4x25mm

Notes:
For the spooler I have used M5x100mm screws with flat head which were easily available in hobby market and I have designed the spooler moder for these screws. If you don't like these screws print Spooler_Side_Right_B.stl and use other screws or threaded rod.

If you don't have capability to manufacture heater block according to the drawing you can use for example V6 Heater Block mounted on L-shape holder from hobby market. In this case buy K type thermocouple in small package not with M6 mounting screw.

Electronics:
I use power supply voltage 24V thus thermostat, motor, cartrige heater and fan are 24V version. If you want to use supply voltage 12V order appropriate version of these component.

I use power supply which is cabable to deliver 10A current which is more than enough for two units. 3A current should be sufficient for one unit.

Accessories:
For cutting the PET strips from bottles you can use my Simple PET Bottle Cutter or PET Bottle Cutter with Bearings.
For storing PET strips you can use my PET Strip Spooler And Spool Holder.