It seems like you have to stick these breadboards onto something or else the power rails eventually want to fall off or you push the contacts out the bottom.

Instead of cutting a raft to size from a piece of plastic or wood, it was easier to just print one the right size.

I also decided to would minimize stress on the connector pins and circuit board if I could add support for the part of the power supply module that extends out over the edge of the board.

The raft works great with the power supply module that I have (I did nip the leads on the underside shorter) but there are several types/designs of the module so if you have one of those then this print will only serve as an example.

I had to print the raft standing vertically to fit on my PrintrBot Play so I used a brim but it will print without if you print it horizontally.

The 123d Design file is included.

Power Supply Module: http://www.ebay.com/itm/321913830338
Half-Size Solderless Breadboard: http://www.ebay.com/itm/121839629869