I see you have made a 3dp spindle clamp. Is this made from ABS fillament? If not then do keep in mind when you run the spindle for long periods of time the heat it generates could affect the tightness of the mount blots thereby introducing inaccuracy in the cutting..
Is actually PLA but I'm aware of it, it was mostly a test to check part fit and assembly. I have a new idea to design, where the part will be simplified, the spindle will sit flush against the metal slider table. That will bring back the spindle close to the axis and will help to dissipate heat. (I'll loose on Z travel as the spindle fan hits the top but is a minor issue for now)