Ticket To Ride Tray for Small Printer

My Printrbot has a small bed -- 100mm x 100mm x 100mm, so I couldn't print the original tray. This has been separated into two trays -- one with three columns and one with two columns, instead of one tray with five columns.
I cut the original with netfabb basic, but it doesn't allow merging parts (that I could find) without paying for the pro version, so I just positioned the "right side" STL on my bed so it's adjacent to the 2- or 3-column piece, merging them for the print. If someone wants