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[Anders Logg <logg@xxxxxxxxx>]

Should be fixed now:

hmin = 1.73205 hmax = 1.73205
hmin = 0.866025 hmax = 0.866025
hmin = 0.433013 hmax = 0.433013
hmin = 0.216506 hmax = 0.216506
hmin = 0.108253 hmax = 0.108253
hmin = 0.0541266 hmax = 0.0541266
hmin = 0.0270633 hmax = 0.0270633
hmin = 0.0135316 hmax = 0.0135316

The problem was a missing check for how to partition the middle
octahedron to avoid increasingly bad aspect ratios.

** Changed in: dolfin
       Status: Confirmed => Fix Committed

-- 
3D mesh refinement gives strange mesh sizes
https://bugs.launchpad.net/bugs/663250
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Status in DOLFIN: Fix Committed

Bug description:
Something slightly peculiar seems to happen with 3d refinement. Refining
a 1 x 1 x 1 Unit Cube 3 times gives largest cell diameter that is
increasing (but smallest cell diameter  that is decreasing as expected).
It does not seem to (only) be a bug in hmax()/hmin(), odd convergence
rates are also observed. 
Example:

from dolfin import *

mesh = UnitCube(1, 1, 1)

for i in range(3):
    mesh = refine(mesh)

    print "Refinement level = ", i
    print "h_max = ", mesh.hmax()
    print "h_min = ", mesh.hmin()

gives:

Refinement level =  0
h_max =  1.65831239518
h_min =  0.866025403784
Refinement level =  1
h_max =  1.47901994577
h_min =  0.433012701892
Refinement level =  2
h_max =  1.7809758561
h_min =  0.216506350946