120 dpcm = 304.8dpi

3.5mm = 42px

y=42 /32 = 1.3125
1312*1.3125 = 1722=x

120*.3=36 pixels margin


42+36*2=114 x 1722+36*2=1794

114/120=9.5mm
1794/120=14.95mm

cut stroke: .25pt = 304.8/6/12/4=1px outside