FlashForge Creator Pro bottom slot plug

Not an original idea, I saw one on Thingiverse but the description made the fit sound iffy. This one fits great (at least it does my Creator Pro) and accommodates the electrical connectors nicely; keeps most filament scrap, etc. from going through to the bottom.

Essential? Well, you've gotten by without it so far, but it just seems like a good idea to me. Anyway, shouldn't your printer have an opportunity to make something nice for itself?