Better Ender 3 - Reverse Flow / Blowhole Board Cover
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This is a BLTouch-compatible board cover, meant to have the stock fan mounted upside-down to blow OUT from the top
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- Creative Commons — Attribution
This is a themed mainboard cover to match the rest of the Better Ender 3 series of parts I've made.
It's built to accommodate the higher height of the BLTouch chips and cabling.
It also mounts the fan backward, so air exhausts out the front of the printer in a “blowhole”, exiting airflow from the top of the case where the hot air is. There are rear intake slots for air to enter the enclosure and flow through the enclosure from the rear to the front.
The airflow in this design is many times higher than what it was going in on the stock or vented designs I've tried.
This uses existing hardware for the cover and fan. The rear screw for the cover will need a little pressure to attach solidly, but I didn't want to weaken the structure by thinning it.
You'll need supports everywhere, tree or other easily-removed recommended, and needle-nose pliers to rip the supports out of the exhaust tube. The holes on the front are oversized on purpose so that you can get at the supports from both directions.
You might be able to print it upright to avoid internal supports, but I have not tried this.