creaction of a very small cylinder
 

when creating a relatively big (r=1, L=20) in folder creating 3d grids with simple meshes (using cylindrical coordinates), there is a sort of plane between the 0 and 360 degreees, if i merge them the cylinder is perfect. However, I want to make a (r=0.00002 and L=0.0008) cylinder and when I merge the cylinder it collapses.

How can i make a small cylinder without any errors? Thanks

Re: creaction of a very small cylinder
 

There is a value "tolerance", which must be set smaller than the grid spacing

Re: creaction of a very small cylinder
 

...And the other way is to use different units when creating the model, not meters, and then speciying the geometry scale factor