Arrow storage rack - modular & extendable

I was in need of storing my out-of-season or training arrows somewhere and not have them everywhere spread around at my home. I normally would have done it using Wood, but since I underwent surgery just recently i opted to go with a 3D Printed variant. My focus was to cover both my indoor (Easton RX-7) as well as my outdoor arrows, which mostly are Easton A/C/E's, Avance's and some cheapo Pandarus full carbon arrows at ID 4.2mm. Further i wanted it to be extendable, should i ever need to