Stealthburner Fan cover for BTT EBB sb2209 (rp2040)

If you are using a BTT SB2209 toolboard, you will also have to print their Stealthburner motor plate, as it provides more room for the toolboard.  As such, they have made available a cover for this that fits perfectly with the new motor plate.  I wanted to have a fan on the cover, so I simply did some modeling work, and created this part.

As you can see, it will fit a 3010 fan, and most likely you will have to use “some” supports, but this depends on the filament you use, and how well your printer is tuned.  I printed this in ASA, with 30% fan for the overhangs, and did not use any support material, and it came out great.

The fan is friction fit, no need for any screws.  The SB2209 also provides a fan connection (if you are not using the probe connector) which you can connect this fan to.  You can then configure klipper to have it turn on with your hotend.

The inside has a little notch, this is where you align the fan to give you room for the fan power cables, so that you do not have to “unhook” them from the fan strain relief.

As you can also see, this is angled, so it blows air directly over the 2209 heatsink on the tool board, but also some of this air will go over the stepper motor as well, so all in all, it should keep everything nice and cool, especially in an enclosed printer….

Print this in regular Voron settings, but since it is a cover, no need to go crazy with walls and infill…. :-)

To wire the fan on the 2209, you can use the gpio6 pin on the toolboard (look at the build guide from BTT), and the jumper set to FAN.  Plus (+) wire goes to plus, and the ground (-) goes to the GPIO pin!  Then a config statement like this gives you control over the fan:

[controller_fan toolhead]
pin: EBBCan:gpio6
kick_start_time: 0.5
heater: extruder
max_power: 1

The fan will turn on with the extruder heater in the above example…you get the idea…

Hopes this helps out those who are using this great tool board from BTT!