RE: [CAD_CAM_EDM_DRO] reprap build started

Actually the easiest solution (now) is to use the maple/aluminum extruder body I have already made. Heat leakage (in the amounts we got) is no longer an issue.
If we had been able to print a new extruder body in ABS, we would not have had a problem to solve.

The filament we have is 3mm ABS, and we find that 200C is a bit cold. We found that one sign of overheated ABS is that the extruded plastic contained tiny bubbles. Underheated ABS gives opaque milky prints (we have transparent ABS) and poor layer bonding. As just the right temperature the prints are crystal clear, to the point where we're tempted to print optical elements.

DC extruders as implemented so far are obsolete, but nothing prevents someone from using a servo-controlled DC motor which would be just as reliable (if not more so) than the stepper feeders.

-Kevin Martin
the Papertrail Handmade Paper & Book Arts
New Dundee, Ontario
518-884-7123
www.papertrail.ca


-----Original Message-----
From: CAD_CAM_EDM_DRO@yahoogroups.com [mailto:CAD_CAM_EDM_DRO@yahoogroups.com] On Behalf Of Mike Payson
Sent: Sunday, October 09, 2011 4:38 PM
To: CAD_CAM_EDM_DRO@yahoogroups.com
Subject: Re: [CAD_CAM_EDM_DRO] reprap build started

[...]
The easiest solution would be to just print a new extruder body out of
ABS...
[...]
Also, you may well be printing too high... 230C was common wisdom, but in my
experience it is much hotter than is needed. I print 1.75mm ABS at 200c,
though 1.75 melts faster so the extra temp may be necessary to get 3mm
filament to melt.[...] Another way to tell you are
extruding too hot is the odor. Overheated ABS stinks badly[...]

DC extruders are completely obsolete,
[...]