Q. on layer thickness on FDM & building cylinders

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Hi All,
        I am working on developing a software tool to help a user
optimize the surface finish on a part to be built on a FDM RP m/c by
choosing proper orientation. I would like your thoughts on the following
2 questions:

1. what is the layer thickness that RP users most frequently use on the FDM
(ofcourse it depends on the application & surface detail required)?

2. How can I quantify that cylindrical surfaces are best built in
  vertical direction as compared to horizontal direction (cylindricity &
surface roughness?) ? If not, please specify why.

Thanks for your time.
Gautham

------------------------------------------------------------------------
 Gautham Kattethota Home : 950, South Terrace Road, #C349
 Grad. student, Tempe AZ 85281
 Dept. of MAE,Mail Code: 6106 Res Ph# : (602)967-4362
 Arizona State University, Off Ph# : (602)965-7830
 Tempe, AZ 85287 Email : gautham@asu.edu
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