The drive gears are designed to be cleaned easily. First, unplug your Palette™/Palette+™ and ensure that it is powered off. Once you've removed the lid to your Palette/Palette+, you can carefully clean the drive gears with a pair of tweezers or a wire brush. This will help the gears grip the filament better to drive in and out of your Palette/Palette+.
Cleaning the ingoing drive gears:
Cleaning the outgoing drive gears: