This listing is for a fan adapter that allows you to mount two 35mm or two 40mm fans on top of the heatsinks found on multiple ARRMA motors for the factory. These adapters use M3-P0.5 nuts in the bottom for securing the two fans to the adapter. We recommend the use of a small amount of blue loctite (medium strength) on all the screws when installing. Since they all have a metal-on-metal connection and the M3 nuts included are the not self-locking type. There is a chance for the screws to vibrate out, right into the fans, if you fail to use any thread locker. Use blue loctite or an equivalent 242 medium strength thread locker to avoid losing fan screws or damaging your fans.

Designed around a ARRMA Outcast 6s BLX motor heatsink 4074, #ARA390299. And it should fit any motor heatsink that has a 35mm fan hole pattern with M3-p0.5 threads centered on the heatsink. According to arrma-rc.com the 4074 #ARA390299 motor heatsink is a standard replacement part for the following ARRMA models; 1/7 Felony 6s BLX, 1/7 Fireteam 6s BLX, 1/7 Infraction 6s BLX V2, 1/7 Mojave 6s V2 BLX, 1/8 Outcast 6s BLX and 1/8 Talion 6s BLX. 

 Confirmed fitment on the 1/8 Outcast 6s BLX and the 1/7 Felony 6s BLX. If purchasing for a model listed above that is not yet confirmed, please let me know. If it doesn't fit, we can redesign an adapter for your ARRMA model or issue a refund upon return. 

This is a 3D Printed Part, except for the screws and nuts. This part is printed with 100% infill for the strongest possible strength.

Material Comparison:

PLA (Polylactic Acid): PLA is a widely used and popular material due to its ease of use and affordability. It has a low melting temperature and is ideal for low-stress applications. It has poor UV resistance and is not recommended for outdoor use.

PLA+ (Improved version of PLA): PLA+ offers improved properties over standard PLA, including increased strength and temperature resistance. It still has limited UV resistance, so it is best used for indoor applications.

CF-PLA (Carbon Fiber reinforced PLA): CF-PLA combines the benefits of PLA with the added strength and rigidity of carbon fiber. It has improved temperature resistance and UV resistance compared to standard PLA, making it a great choice for outdoor applications.

PETG (Glycol-modified Polyethylene Terephthalate): PETG is a strong and flexible material that is resistant to impact, chemicals, and UV light. It is easy to print and has a low tendency to warp, making it a popular choice for many applications.

CF-PETG (Carbon Fiber reinforced PETG): CF-PETG offers improved strength and stiffness compared to standard PETG, thanks to the addition of carbon fiber. It has excellent temperature and UV resistance, making it a great choice for outdoor and high-stress applications.

Polycarbonate: Polycarbonate is a strong and durable material that is resistant to impact and high temperatures. It has good UV resistance, making it a popular choice for outdoor applications.

CF-Polycarbonate (Carbon Fiber reinforced Polycarbonate): CF-Polycarbonate offers the highest strength and rigidity of all the materials, making it ideal for high-stress applications. It has excellent temperature and UV resistance, making it the perfect choice for outdoor and high-stress applications where strength and durability are critical.

Glass Transition Temperature (Tg):

PLA: 60-65°C
PLA+: 70-75°C
CF-PLA: 70-75°C
PETG: 80-85°C
CF-PETG: 80-85°C
Polycarbonate: 113°C
CF-Polycarbonate: 113°C

Note: The above values are general guidelines and may vary depending on specific formulation and manufacturing processes of different materials. The glass transition temperature is the temperature at which a material changes from a solid to a rubbery state. 

*Included with purchase:
1x Fan Adapter
8x Pre-Installed M3-p0.5 Nuts
4x M3-p0.5x10mm Countersink Screws for securing the fan adapter to the motor heatsink
8x M3x20mm Button Head Screws
1x Dual Fan Debris Cover in matching material and color

*Fans, heatsink and R/C vehicle are NOT included. 


Proudly designed and manufactured in the U.S.A. by Enigma 3D Prints. 


Orders ship USPS first class, typically shipped same day if paid by 10 A.M. C.S.T. 

Orders placed after 10 A.M. C.S.T. will ship next day guaranteed.

Returns Accepted within 30 days, Buyer pays for shipping. 

This is a 3D Printed Part. As such, it may have minor surface imperfections that in no way interfere with this products functionality.

If you need anything 3D printed, please contact me. As I am always willing to help with your 3D printing needs. And in most cases I can design to your measurements/details. Photos help. If it fit's, it print's.