Shimano derailleur lock

I made this as a lock is the only thing that Shimano should add to their derailleurs.

This is for the 1x12 XT derailleur but looking at the pictures af the other Shimano 1x12 derailleurs it should fit those too.

This makes it easier to remove and install a chain or taking out the rear wheel during maintenance.

Simply move the derailleur cage forward and hook in the tool like on the picture.

I have printed this in PEGT with the default Prusament settings at 0.3mm layerheight.