Image above created by commands below. Create a cylindrical ring and subtract a torus from it.
fini
/cle
/vie,1,1,1,1,1
/vup,1,z
a=0.100
r1=0.020
r2=0.025
r_fillet=0.005
/prep7
bloc,-a/2,a/2,-a/2,a/2,,-a
cyli,r1,r2,,a
cyli,r2,r2+r_fillet,,r_fillet
wpof,,,r_fillet
toru,r_fillet,r2+r_fillet
vsbv,3,4
vadd,all
vplo
Bill
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