Part stretched vertically

The part I am printing is 9.95mm in height, and the print turned out perfectly (except for one instance of acceleration issues and filament missing the mark). The actual printed height is 15.58mm. This is 156% higher than original. All the other dimensions are the same. Could it be something with my steps/mm? Thanks
I am on a RepRap Prusa Mendel i3 w/ .4mm hotend
Files:
GCODE: [www.dropbox.com]
STL: [www.dropbox.com]
Slic3r Config: [www.dropbox.com]
PHOTO: [www.dropbox.com]

Edited 1 time(s). Last edit at 07/28/2015 07:34PM by hhbhagat.

What you got: 15.58
What you wanted: 9.95
So.. 15.58/9.95=1.56582914573
take your current Z esteps value and add that number to it.
But, there is an easier way!

What is driving your Z axis? lead screw? threaded rod?
If you have threaded rod, somewhere it should say "M(some number) 2000mm x 0.8" or something like that. In this case the pitch of the threads is 0.8mm per revolution. This will work with leadscrews too, but I don't know how they are labled.
go to prusaprinters.org and scroll own to where it says "Steps per millimeter - leadscrew driven systems". Input your motor pitch, microstepping, and everything else you know if it asks for it.

Quote
Montiey
What you got: 15.58
What you wanted: 9.95
So.. 15.58/9.95=1.56582914573
take your current Z esteps value and add that number to it.

I think you mean multiply by that.

I measured my rods and they are less than 8mm in diameter, like 7.8mm. Is that bad? I got this 3D printer preassembled so that's my source of confusion here. My current value for my Z Steps is 4000.

7.8mm when measured by calipers are common. If you're using conventional z-axis lead screw, 8mm diameter with 1.25mm pitch, z axis steps/mm should be around 2560