Topic: I would like your opinion on this extruder.
I was doing a google search for schematics and stumbled on this link.
http://deltaprinter.co.za/filamentextruder/index.html
The particulars or the extruder are....
Steel tube length:200 mm (seamless stainless steel pipe)
OD:12.7 mm
ID: 10mm
Copper tube length: 80 mm - ordinary plumbers pipe
OD: 15 mm
ID: 13 mm
mm of overlapping between steel and copper tube: 10 mm
auger length: 300 mm - cut to size that will fit your setup
auger diameter: 10mm
Feed-window length: 25 mm
Feed-window width: 7.5 mm
Window distance from steel tube end: 50 mm
(auger) mm of exceeding the steel tubes end: 0 mm
Distance between the auger tip and the nozzles inner surface: 80-10 = 70 mm
Copper tube temperature at the end of warming up: not measured
Copper tube temperature during extruding: not measured
Aluminum heater block : 55 x 45 x 20 mm
Aluminum heatsink 65 OD ( I used a salvaged part from a motor found in an old tape recorder)
Motor RPM 30When you extrude for the first time feed the plastic into the heat chamber up to the nozzle and switch off the motor - wait for 15 - 30 minutes and then proceed.
Use a piece of wire through the nozzle to gauge the front of the plastic.
When you extrude and get a ripple effect on the filament your temperature is to low.
make sure that you allow enough time for the plastic to melt before you start the motor for extrusion. I lost a pipe and broke an auger bit when did not wait long enough and the motor distorted the stainless pipe at the feed window. I then made the feed window smaller to the current dimensions listed above.
What I am wondering is this.
Should I bother to get a PID controller for this as well?
Should I contemplate increasing the bore to the Lyman spec of 0.625?