The tall tower calibration piece I tried did not work at all and just turned into a gooey mess. I think that I need a fan. I have found an x carriage and a fan attachment that I will try printing soon. It uses a 40mm fan to cool the print quickly so they layers stay where there meant to. I chose the carriage designed by Greg Frost. Greg seems to be someone with a reputation in the reprap community, and lives in Australia.