E3D 0.6mm Nozzle Useless (Page 1 of 2)

Have you also increased temperature? Increasing flow rate means less time to absorb heat, so you need a higher heater block temp...

Also:

0.85*0.5=0.425sqmm * 80mm/sec = 34cumm/sec
0.42 (assumed) * 0.3 (assumed) * 150mm/sec = 18.9cumm/sec

So even with the linear speed limitation, a 0.6mm nozzle still nearly DOUBLES volumetric flow rate. On top of that, the difference is really larger as you won't spend much time if any at 150mm/sec due to accel limits. Not sure I'd call that "useless".

Math is awfully inconvenient sometimes.

Degrees C? Are you extruding jelly? I also doubt you are running the extruder motor at 300mm/sec. That would be a meter of filament every 3 seconds, and I would be very impressed.

I meant 225 - 250 C.  Whoops!

I  believe repetier says mm/min

Also, Elmoret's quote on math being inconvenient is great. Moreover, what he pointed out.

I think your layer height is too big as well.  Typically the maximum layer height you should run is 80% of your nozzle diameter which would be 0.48 but at high speed I would lower it to get a little more squish.

I am running everything at .4mm layer height and 0.7mm width for now.  I tried it at 100mm/s to see if I could run faster because of the lower layer height, but it just started blobbing again.  Back down at 80 mm/s and it worked fine.  Pictures attached.

When the widths are set to auto, it does seem to product a better print.  But the numbers seem funny.  The widths are all in the range of .60 to .65 mm and the first layer width is .52 mm.  That seems a little narrow for a .6 mm nozzle, doesn't it?

The first layer would be affected by your Z height calibration?. I assume you could lessen the gap to make up for the first layer width.

Unless you have something else strange going on?

Question - On what basis are you determining you are using 80mm/s ?
The setting in Slic3r's Speed tab (assuming you set them ALL to 80mm/s - which you shouldn't....)?
Or is it the Slider in Repetier?
Or have you run this through gcode-analyzer and determined the tool-path speeds and applied the Vector to it ?

Because its impossible to make a statement of 'I print at X-speedmm/s'.. as the 'print speed' changes depending on if its Interior perimeter, exterior perimeter, infill, top/bottom, first layer, bridge..

It also depends on tool-path length for that travel. At each transition of direction it will slow down to the 'x-y jerk' value (with caveats, too many to list here). It will then ramp back up to its relevant tool-path speed using the acceleration vectors in EEPROM.. It also depends on Direction - a movement in the Y direction alone will move faster than a Diagonal movement in the X/Y direction.. This is why often 0° offset rectilinear infill can be 4-5 times faster than hexagonal or even 45° offset rectilinear....

So in short - there really is no such thing as 'I print at X speed' - and if you actually average it all out its usually much slower than the numbers would infer due to complexity of movement screwing it all up. 

Now - regarding printing with a .6mm nozzle in general - You are moving a crapload (I believe thats the scientific term ) more volume of plastic than a .2/.3/.4mm .. Elmoret or someone smarter than me can give you the math I'm sure. You can't just expect to move a substantially increased volume of plastic at a faster physical speed - but instead you move more plastic for the same given speed which means you need to overall extrude less.  So you don't run it 'faster' in terms of linear speed - as you are already moving *more* plastic which is where the idea that you can print 'faster' with a .6mm nozzle comes from. Your axis dont move faster, but for each movement, you do move more plastic, requiring less *total* time... by exploiting techniques of printing 1x60mm perimeter which is faster than printing 2 x 40mm perimeters..etc etc

Then theres the whole other thing regarding the different back-pressure and its impact to flow-rate/speeds as a result in the change of nozzle size with a constant melt-zone... but that's beyond my ability to articulate.

To ensure quality prints on a Stock solidoodle (meaning the mechanics, not the hot end so much) you really shouldn't run the exterior perimeters over 55 - you can push it based on the particular shapes geometry but it's a loosing game above that. Internal perimeters, happily will go up to 80+ (even 100) without turning too ugly... Infill is usually best served at the same speed as interior. Bridges boil down to a magical combination of temperature and filament.. There is values that 'usually work' but the 'Best' speed/temp combo is fairly dynamic depending on filament etc.. And none of this needs to/should change based on Nozzle size beyond some minor tweakage knowing the cause-and-effect of that setting you tweak.

tl;dr - Theres no such thing as 'I print at X-speed' , and, you print 'faster' with bigger nozzles by virtue of moving more plastic, not physically increasing speed.

Yes, thank you for articulating this.  I've attached my Repetier speed settings.  It seems though that if I raise any of them over 80, whether it's perimeters, infill, or whatever, I get blobbing.

It is true that I am extruding a "crapload" more plastic than with a smaller nozzle, and I am quite happy that I am able to print faster.  No complaints there.  But my main point is that there is really no benefit to using a 0.6 mm nozzle over a 0.5 mm nozzle if you just have to run slower.  I would rather have the ability to get better detail when I want it while still being able to push the maximum volume of plastic when I want that.  In hindsight, I would have ordered a 0.5mm nozzle to get the best balance of both worlds.  Hopefully someone else who is dreaming of super fast printing by using a bigger nozzle can learn from my experience (that is assuming I am not doing something else horribly wrong).

It's not the kind of blobs related to retraction (look at the pic I posted above).  It can't extrude smoothly over a certain volume limit, even during a straight section.  I'm not talking about a decrease in quality.  This is an inability to print anything.