<![CDATA[SoliForum - 3D Printing Community — Nozzle diameter and free-air extrusion]]> https://www.soliforum.com/topic/5686/nozzle-diameter-and-freeair-extrusion/ Wed, 26 Feb 2014 06:04:04 +0000 PunBB <![CDATA[Re: Nozzle diameter and free-air extrusion]]> https://www.soliforum.com/post/50898/#p50898 ggunners wrote:

Related question, when changing filament, what calibration steps are needed? Just extruder calibration and flow rate, or just flow rate?


I have always just calibrated flow rate. I dont see why extruder would be different per roll. Plus, flow rate will compensate if there was a difference.


smile

]]> Wed, 26 Feb 2014 06:04:04 +0000 https://www.soliforum.com/post/50898/#p50898 <![CDATA[Re: Nozzle diameter and free-air extrusion]]> https://www.soliforum.com/post/50835/#p50835 Related question, when changing filament, what calibration steps are needed? Just extruder calibration and flow rate, or just flow rate?

]]> Tue, 25 Feb 2014 16:34:49 +0000 https://www.soliforum.com/post/50835/#p50835 <![CDATA[Re: Nozzle diameter and free-air extrusion]]> https://www.soliforum.com/post/50833/#p50833 Thanks! Upon further Googling, it also seems that is not very relevant when extruding *not* in free air (where hot filament immediately makes contact with other filament and it's shape is constrained).

]]> Tue, 25 Feb 2014 16:10:37 +0000 https://www.soliforum.com/post/50833/#p50833 <![CDATA[Re: Nozzle diameter and free-air extrusion]]> https://www.soliforum.com/post/50741/#p50741 What elmoret said and linked to ... and yes it will be different between filaments based on their ingredient ratios and different based on the particular nozzle dimensions its shoved through and the speed you do that at ...

]]> Mon, 24 Feb 2014 21:47:57 +0000 https://www.soliforum.com/post/50741/#p50741 <![CDATA[Re: Nozzle diameter and free-air extrusion]]> https://www.soliforum.com/post/50718/#p50718 Yes, it is normal.

http://en.wikipedia.org/wiki/Die_swell

]]> Mon, 24 Feb 2014 15:54:56 +0000 https://www.soliforum.com/post/50718/#p50718 <![CDATA[Nozzle diameter and free-air extrusion]]> https://www.soliforum.com/post/50717/#p50717 Not sure why, but after swapping filament yesterday, I measured the diameter of the output.  My micrometer said .535mm (with zero variation axially, and just 3 microns radially), very consistent.  However, the nominal diameter of my nozzle is .4mm. 

What am I missing?  Is this expected?  This was free-air extrusion @100mm/min with filament that is very close to it's nominal diameter of 1.75mm (grey Octave ABS).  FWIW, my extrusion multiplier is .89 after calibration, which doesn't quite match either (.4/.535 = 0.75) -- this was manual extrusion, however, so multiplier is irrelevant.

]]> Mon, 24 Feb 2014 15:28:41 +0000 https://www.soliforum.com/post/50717/#p50717