Z Axis Acting funny? Help!

Check your Z-axis — are the linear slides clean and well-lubricated?

See:

Are the Z-axis motor wiring and connectors all in good condition and securely connected?

Do you or a friend have a multimeter to check them for continuity through the full range of machine motion?

If you don’t find anything obvious to correct, let us know at support@carbide3d.com and we’ll do our best to assist.