Spool Raiser for Wanhao i3 Plus
thingiverse
This is a custom version, but I think the standard design is only optimized for the i3, not the i3 plus so appears too far to the right. This custom design has cutouts that surround the recessed nuts, allowing the extender to sit more centrally and preventing it from shifting when changing filament.
Download Model from thingiverse
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