1 Topic by Downeasta

  • Downeasta
  • Downeasta
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  • From: Near - Ellsworth Maine
  • Registered: 2013-06-16
  • Posts: 120

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 30

When 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?

I am an open book, write on my pages that I may learn the wisdom that you posses.

Downeasta's Website

2 Reply by AndersE

  • AndersE
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  • From: Sweden
  • Registered: 2014-07-20
  • Posts: 83

Re: I would like your opinion on this extruder.

How the heck could he break the auger and distort the barrel with a weak car windscreen wiper motor??

My first version of a extruder used a windscreenwiper motor, even geared further down to 5-6rpm it motor
had not enough power to turn with a cold barrel.

3 Reply by n2ri (edited by n2ri 2014-10-03 08:17:29)

  • n2ri
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  • From: St Louis MO USA area
  • Registered: 2013-02-03
  • Posts: 2,539

Re: I would like your opinion on this extruder.

some wiper motors are big gear reduction things lol also my new KIA would shake the car sitting at signal light with wipers on LMAO. plus his tubing is just that thin wall small dia SS/Copper rigid tubing. not half as strong as black iron pipe the Dia most use. and part of the inside dia is same as auger dia. then half the SS tube is cut away weakening it even more and no thermal sensors to prevent over heating so as not to anneal the metal tubes etc. its just a matter of when it self destructs. I have seen better tube used to feed cold shake mix to freeze drum of softserve machines with no torque at all applied to the tube. and looks like instructions on the site say he pushes melted plastic through a 1mm orifice 1st. why? to clog it? and look at size of plastic pellets compared to tube/auger they are trying to feed through. heck why use smallest tube possible for plastic chunks? LOL no way thats a good design. his auger/tubes are maybe 1/3rd the size they need to be for starters. but its in Europe using 220v with little safety codes so...
LOL dig that mounting/tension bracket setup too. I see tons of potential for twisting.

Solidoodle 2 with Deluxe kit cover & glass bed with heater. and 2nd board SD2 used not 3rd and alum platform not installed yet still wood. also need cooling fan installed to board. use Repetier Host couple vers. Slic3r also have all free ware STL programs