0.8mm vs 0.25mm nozzle

@Marquis Johnson, did you replace the couplers on both your Robo's, just the original, or just the newer R1?

 

The difference in quality/resolution between the two is much finer than I would have thought.
I know when I tested 0.8 against 0.4 it was not terribly noticeable. You could see it if you really looked hard.

 

OK, @Frankn which if these it 0.8?
The other is 0.4

Good test because both of these are less than 1 inch across.

 

and they are un-tocuhed up -- straight off of the printer

I keep test samples around for comparisons.

One is PLA, 170C 0.8 volcano
other is PLA 195C, 0.4

(same spool)

 

Actually, that is sort of a cheat since if I flipped them over to expose the first layer you can see the width difference easier
Once it gets flowing though, it is really hard.

 

You can see from the bottom side. Same arrangement, just upside down. This gives it away. The first layer is the 'tell'

These were done as part of tuning the nozzles a while back. I always test a spool to find my best settings with a small model like this.
I have way too many of these floating around
But is is a nice material compare sometimes. The Stainless one came out looking awesome.



Once 'dialed in' you seriously can't easily tell the difference (and 0.4mm is a tiny difference).
You do have to get it calibrated.

 

This is a better test model for various reasons. It stresses a lot more of the calibration edges for the printer. Too hot, too cold, too fast, too slow, not enough retraction, etc... easier to tell with the fine details. True, if all you want is to see that you can print then the cube is good enough. This is a small enough object that it prints quick which makes testing easy.

 

http://www.thingiverse.com/thing:66175

It is a 15 minute or less print. Sort of depends on speed and nozzle size
But yes, quick.

 

The more you tune it the better/closer it will look
I think it looks good.