Hi,I have completed printing and assembly of SP11, but am having a problem with the second hand taking about 1 min 17 seconds to complete one revolution. Similarly, watching the stepper gear rotate, it rotates slower than the 6.9 rpm the manual indicates it should (by eye and a stopwatch it appears to be closer to 5.4rpm).I am using the cnc shield, with arduino nano. I purchased a 1.8deg stepper motor (model #17HS15-1504S-X1) , and have the pin setup on the cnc shield set to option 5  as indicated in the manual. When I look at the debug info in serial monitor, it does appear to recognize that I have set option 5 for speed, and when it counts the seconds and logs each minute, they seem accurate to my stopwatch at 1 minute per debug line. It just seems to be my motor is not running at the expected RPM for the setting, and I am unsure what else to troubleshoot.Any suggestions are welcome, if there's any other info I can provide, please let me know.-J.