Homing error Y #12305 (MINI/MINI+)

This article is also available in following languages: 

What happened?

The Original Prusa MINI/+ displays the message: "Failed to home the Y-axis, make sure there is no obstacle on Y-axis".

Error name: Homing error Y

Error code: #12305 

The error is most likely caused by a bad movement of the Y-carriage along the Y-axis.

How to fix it? 

Y-axis movement

Make sure there are no obstructions in the path of the Y-axis. For example, there might be a piece of filament stuck around the belt, or on a smooth rod, from a previous print.

Y-axis belt tension

Check the Y-axis belt tension and adjust it, following our dedicated article on belt adjustment.

Y-axis motor pulley

The Y-axis motor pulley is attached to the Y-axis motor shaft. The motor shaft has one flat side. The pulley has two set screws, ensure that one of the two set screws is aligned with the flat part of the motor shaft. Make sure the other set screw is also tightened, not excessively, and that there is a small space between the pulley and the motor.