Drawing of shaft vs flattened shaft

Drawing of shaft vs flattened shaft

Initially I thought that because there were two grub screws on the motors that I would not need to flatten the motor shafts due to the fact that there supposedly was 2x the grip. However what I didn’t know what that the metal used in motor shafts is purposely softer to prevent damage to the motor when under high torque, which I soon found out when my prints kept coming out shifted in either the x or y axis.┬áThe drawings above show in general why motor shafts need to be flat. The problem was that the grub screws were made of a harder metal than the motor shaft so when under torque the grub screws would bore through the motor shaft.

Tantalized by the steady pace of progression, I decided that the only way to remedy this situation was to flatten the motor shafts. The results were nonetheless spectacular as since the event, my prints have not shifted at all and the pulleys hold quite well to the shaft.

For a video on how to flatten the motor shafts with a dremel please refer to the video below:

[youtube=https://www.youtube.com/watch?v=h4S9gxzQ39g&w=320&h=240&rel=0]