What I did on my Anycubic was that I stuck the carriage spacers underneath and didn't worry about it. Worked fine. The carriage is rarely near either pulley unless homed; during prints it's usually much closer to the middle of the rails.
The smart effector is such a win that noone should hesitate to install it if possible.
Just rebuilt my kossel with larger frame and bed. Now the only parts left from the original Anycubic are the linear rails. Had to build my own effector arms due to not finding any long enough for the new size. (Thanks, David, for the pointer on your blog to the video on cutting carbon tubing!) Anyway, apparently I've gone over the limit of the inertia in the system with these new arms. Old arms were 288mm/4mm, these are 495mm/8mm so quite a bit larger. Using smart effector with mag balls, same as before. Now, when the motors are turned off, the effector falls down, where before it would not. Other than not turning the motors off at the end of a print, any good way to keep the effector from falling onto the print? Got a melted dent in a part from the nozzle falling onto it just now.
Anyone have suggestions on how to fix this?
Other than that, the Duet controller made the change pretty painless--just update a few values in config.g and recalibrate, ready to go!
Thanks in advance for any help or comments.