I’m assuming this issue can be a problem with any device that moves or vibrates.  You put it through heat cycles, and vibration, and things loosen up, and fall out.  Just ask anyone who rides a Harley.  Here is a recommendation for anybody who buys a FlashForge printer.

The pulley grub screws should be removed on the X and Y Axes and secured with low/medium strength threadlocker before being screwed back in.  I also took the x-axis motor out and filed a flat spot on the shaft for the screw to bite against. They tend to work themselves loose over time, resulting in a print that translates itself laterally across the bed during a print.  It will also grind itself slowly into the rod hanger for the X-Axis carriage. Worse, it fails all together, and pukes an entire print’s worth of plastic while moving in only one axis.  The result usually gets all up in the ceramic tape around the heater block, and makes a general mess of things.

Grub screw loosening

Grub screw loosening

loose X-Axis drive pulley grinds into rod hanger.

loose X-Axis drive pulley grinds into rod hanger.

What happens when the X-axis pulley grub screw loosens completely

What happens when the X-axis pulley grub screw loosens completely

What happens when the X-axis pulley grub screw loosens completely

What happens when the X-axis pulley grub screw loosens completely

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