Dremel Model 395 Flexible coupler

My well used dremel tool stopped working and after taking it apart I found that the flexible rubber coupler between the motor and the output shaft had disintegrated. I took some rough measurements with some calipers designed a replacement.

This is the first thing I have printed with flexible filament and the the splines didn't come out well with a lot of detail, but it went together and seems to do the job.

UPDATE:
I have found that this part also works in the Craftsman brand clone of th