SoliForum - 3D Printing Community — Heat degradtion of plastic from the start up and stop cycle.

Re: Heat degradtion of plastic from the start up and stop cycle.

2014-12-05T18:26:44Z

elmoret wrote:

Nnnn wrote:
Industry extruders generally preheat for ~2hrs before loading pellets and commencing manufacturing.
And people complain about 30 minutes of preheat on a Filastruder!

An industrial extruder will also give you 2kg/minute or whatever after their 2 hour preheat

Re: Heat degradtion of plastic from the start up and stop cycle.

2014-12-03T17:38:06Z

Nnnn wrote:

Industry extruders generally preheat for ~2hrs before loading pellets and commencing manufacturing.

And people complain about 30 minutes of preheat on a Filastruder!

Re: Heat degradtion of plastic from the start up and stop cycle.

2014-12-03T06:38:54Z

Ggalisky wrote:

elmoret wrote:
I don't run it to empty, ever - and I've never had layer bonding issues.
Is there any harm in running it to empty? I do it all the time when switching materials.

In the plastic extruding industry it is standard practice to completely empty an extruder after the work day has ended.

Having plastic left in the extruder will cause an increase in time required to preheat the extruder the next day. Industry extruders generally preheat for ~2hrs before loading pellets and commencing manufacturing.

Re: Heat degradtion of plastic from the start up and stop cycle.

2014-11-27T17:46:45Z

No harm, other than the last several feet of material will be less than normal diameter, and possibly inconsistent diameter.

Re: Heat degradtion of plastic from the start up and stop cycle.

2014-11-27T17:31:21Z

elmoret wrote:

I don't run it to empty, ever - and I've never had layer bonding issues.

Is there any harm in running it to empty? I do it all the time when switching materials.

Re: Heat degradtion of plastic from the start up and stop cycle.

2014-11-27T17:22:41Z

I don't run it to empty, ever - and I've never had layer bonding issues.

Re: Heat degradtion of plastic from the start up and stop cycle.

2014-11-27T17:16:58Z

So the moral of the story is the extrude as much as you can ABS at once, and at the end of each extrusion run let the Filastruder run until it extrudes everything.

Re: Heat degradtion of plastic from the start up and stop cycle.

2014-11-27T17:11:15Z

In theory, very slightly, yes. A Filastruder runs cooler than a hotend though, so it wouldn't be as bad as running it through a printer.

Heat degradtion of plastic from the start up and stop cycle.

2014-11-27T16:58:15Z

Lets say your running natural MG94 ABS on your v1.5 Filastruder. You start it up and extrude a pound, and then stop it. The next day you start it up again and extrude another pound. Would the plastic that was in the barrel at the end of the first extrusion run degrade from being heated up again when you start your second extrusion run?