Bottle Drying Rack - with separate arms

This is a remix of the segment and arms of the Bottle Drying Rack in this item: http://www.thingiverse.com/thing:33708.

I like the modular design of this rack, but I have had several arms break under load. I've concluded that this is due to the weight of the bottle producing a shear force trying to separate the print layers of the arms. The layer-layer bond of the 8mm square arms is not that strong, and it doesn't take much to snap them.

My solution is to have the arm layers perpend