SummaryA set of numbers and rails to build a nice, durable number sign for your mailbox. You can combine the numbers side to side to print a single plaque if you wish. After you print your numbers measure the total width and print a top rail to the exact width and a bottom rail to the width plus 1/2" (12.7mm). The Rail Caps fit over the longer bottom rail and have holes for easy mounting. After assembly I used a piece of ultra bright plastic coated reflective tape on the backside. Now the numbers jump out at you at night, my previous mailbox numbers had a sprayed on reflective coating that had grown dim over time. Added a 'Flush Mount Cap' for mounting on the side of the mailbox or wall. Print two top rails 1/2" (12.7mm) longer than the total width of the numbers and two Flush Mount Caps for the set. EDIT 05/16: Updated Rail Cap so each end has the proper geometry. Print SettingsPrinter Brand: MakerBotPrinter: MakerBot Replicator Z18Rafts: Doesn't MatterSupports: NoResolution: .2mmInfill: 10%Post-PrintingAssemblyUse glue to lock the top and bottom rails to the assembled numbers. Use the rail caps to mount to the top of your mailbox.