How to solve problems with gaps and overlaps in bad imported CAD geometry in Fidesys

reset
brick x 10 y 100 z 1000
brick x 100 y 10 z 1000
move Volume 2  y 54.9 include_merged 
brick x 100 y 10 z 1000
move Volume 3  y -55.1 include_merged 
undo group begin
volume all size auto factor 3
mesh volume all
undo group end
create material 1
modify material 1 name 'mat1'
modify material 1 set property 'MODULUS' value 200000
modify material 1 set property 'POISSON' value 0.3
set duplicate block elements off
block 1 add volume all
block 'Block 1' material 1 cs 1 element solid order 1
create displacement  on surface 8 2 14  dof all fix  
create force  on surface 1  force value 1000 direction 0 1 0
create contact autoselect tolerance 0.1 type tied method auto
analysis type static elasticity dim3
calculation start path 'C:/Users/User/Documents/CAE-Fidesys-4.0/fidesys01.pvd'
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