this is to complicated for me to understand. but i want to know more about 3D printing.

What made you not understand about 3D printing.? You may ask any questions about what you want to know, and later we the members here who know the answer to mean you'll try to answer it, because that's what we are in the forum, and help one another. Come on do not be shy to ask, cheers

...
My filament does vary from 1.68-1.78 and is set to 1.73, but I think I could be more accurate.
...

-    That's a bit heavy of a fluctuation, which can make tuning difficult. Another aspect to check is its circularity, this also has to be taken into consideration when setting the filament diameter variable. If your curious about my methods I wrote a short article detailing them.

My Printing Methods: goc3d.blogspot.com/2014/11/3d-printing-tips-strength-accuracy.html

-    When you switch over to the SainSmart I would be curious to hear about your results. I was using their PLA and wasn't having the greatest quality with it.

Tip: If this is going to be your first filament change, save out your 'hatchbox' settings/configs. When changing between suppliers and some colors you'll more than likely have to re-tweak the settings for each.

My Filament Experiences: goc3d.blogspot.com/2014/11/3d-printing-filament-basic-review.html

Let me know if I can be of any help.

The vase also looks awesome...It's probably got a lot to do with the material as well, but on that vase there's several areas where I don't even see the grain of the layers. Are you still using a print temp above 230 C?

These were both printed at .2mm layer height and I am pleased with the way they printed.  Considering the vase was 200mm high, it shows that the printer maintained precision pretty well up the Z axis.  There is a bit of a rough spot in the center of the picture that I can't explain.

So .2 and .3 are great, perhaps .1mm is just beyond my skills or beyond the printer.

There are also option in slic3r to increase brim size and skirt height which might help with warping issues too.

My filament does vary from 1.68-1.78 and is set to 1.73, but I think I could be more accurate.

For anyone considering Plastic Scribbler, they have been very helpful on the tech support side and answer emails quickly.  I'm sure the printer can be 'fixed' with software and/or screw driver.  I doubt there is anything wrong with the printer build.

Something else worth mentioning is to take the mean of your actual filament diameter and use that in slic3r.  Just measure the filament in several places 10-20 and take the average.  If the filament isn't consistent it maybe extruding too much plastic in areas and then going away in other areas.  That's one of the problems with cheap filament.

Hope this helps.