Nerf Stryfe (UltraStryfe) Brushless Motor Cage & Wheels

by Ultrasonic2, published

Nerf Stryfe (UltraStryfe) Brushless Motor Cage & Wheels by Ultrasonic2 Jul 31, 2017
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Built for the stryfe and RaceStar 3000KV 2205 Brushless motors ONLY ..For more info sit back and relax while you watch the videos :)


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Worker on AliExpress

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Nerf Blasters on Amazon

FYI you do not need to cut the stryfe to fit the motors in so NO "Motor cover" is required.. Mine has motor covers because previously i was running 180's. This means your blaster can look completely stock if you wish. HOWEVER Since "Gen 2" the end of the Flywheel motor bolts will grind against the inside of the Shell. You can drill the Shell this and cover the holes OR Grind 2mm off the top of the Bolts and thus it wont grind on the Shell. (Watch Gen 2 Video)

Printed on Tronxy X3A 3D Printer

The Licnence you agree to when downloading this thing prevents you from making a profit from MY thing. This means you CAN NOT sell this or any of my other things on places like Ebay, Facebook, Forums or Etsy. You also may Not sell My parts as Part of a complete blaster. I don't profit from putting this thing us as a Free download and therefore no one else should too.

Due to the specific print requirements required to print a successful Ultra cage and Wheels we have now opened a Etsy store. Purchasing from this store you can be assured a HIGH quality product .. Not some cheap disappointing rubbish.
Also a complete drop in kits including the cage and wheels are also available to those who are looking for a simple drop in kit.
Another option is this APPROVED user.

Please consider Leaving me a TIP for this Free Nerf Mod ...Thanks


Ultrasonic2 Stryfe Cage Gen x.x.STL
3D Printed Stryfe motor cage (Does not Fit Rapidstrike)

Wheels are now maintained at this link.

Arduino Code
There are 2 options
Brake time setting
FallToTime = 0 for no brake ESC, 4000ms or greater for Braked ESC's
Accelerate time setting
RiseToTime = 0ms for 3s batteries .. 4s 50 to 1000ms MAYBE required.
Optional Trimpot to adjust RPM
int EnablePot =0 ; // 1 = yes 0 = no
int InveretPotDirection = 0; // 1 = yes 0 =no

NO Brake BLHeli_Noname - EMAX_Ltng_20A - Rev. 14.9 - Multi_171206.ini
BLheli Flash code for EMAX lightning 30amp ESC

Ultra-Nerf.ino (Not recomended)
Arduino Code Brake
Used for people buying BlHeli_S or BlHeli_32 ESC where you can't turn the brake off. The Arduino code slowly reduces the RPM AFTER the trigger pull to reduce the braking effect ... The braking effect causes extreme heating. Even with this code 4s operation results in extreme heating of the cage leading to melting.

Parts List
Arduino Nano 3.0 With CABLE & Pre-Soldered Pins
AliExpress http://s.click.aliexpress.com/e/Eu7QRnm
Amazon http://amzn.to/2FZJCJy

Rectifier Diode
Aliexpress http://s.click.aliexpress.com/e/MFeUrJ2
Amazon http://amzn.to/2FVT2G5

28V To 5V FIXED Buck
Amazon http://amzn.to/2u7P0Jo

RaceStar 3000KV Brushless Motors (3000KV RECOMENDED)
Aliexpress http://s.click.aliexpress.com/e/uJ2vnEy
You need one Clockwise Motor and One Counter Clockwise. Use thread lock on the M3 bolts, otherwise they may come loose.
Amazon http://amzn.to/2pvluZd

EMAX BLHeli lightning 30A ESC
Aliexpress http://s.click.aliexpress.com/e/fQBiaYv
Two ESC's are required.

ESC BLHeli USB Programmer
Aliexpress http://s.click.aliexpress.com/e/3RRby3B
Amazon http://amzn.to/2pxozY7

ESC signal Y extension
Must be twisted. Straight wires can lead to glitchy operation.(Seriously)

2x 3M 18 Gauge AWG Silicone Rubber Wire Cable
For extending ESC input power (one cable per ESC)

20 AWG Flexible Silicone Wire Cable 20AWG
(Used between the ESC's to Motors)

28AWG Flexible Silicone Wire Cable
Used for connecting everything other than the the motors' / ESC's

10k Pot
This is OPTIONAL (can be used to adjust the max RPM/FPS)

ESC Servo Tester (This will require 5v input voltage.)
This is OPTIONAL (Not actually Required for the mod But useful for testing)

DO NOT power these motors with low cost low frequency ESC's. ONLY power them with high frequency ESC with F396 CPUs @ 48mhz. Otherwise the ESC's will be unable to spin the HIGH pole count motors at the expected speed of 37800 and results will be poorer.
Also ensure the firmware on the ESC is update (very simple to do with the BLHelli app) As improvements in topend rotations have been made ( FYI mine were 3 revisions behind out of the box).

Suggested battery
ZOP Power Lipo Battery 11.1V 2200Mah 3S 30C

Suggested Charger
Lipo Balance Charger iMAX B6 charger + 12v 5A Power Adapter + Charging Cables

Update 27/Oct/2017
Change ESC flash code to prevent it from resting its self up Please ensure you've updated your ESC to this.

Update 28/Oct/2017
Gen 2.0 Cage And wheels are released. This is a COMPETE redesign from the ground up

Update 31/Oct/2017
Gen 2.1 reduced the OD of the barrel

Update 4/Nov/2017
ESC Code .. Reduced acceleration due to d-sync issues, Particularly bad with super high quality batteries.
Gen 2.2 Improved entry to the barrel

Update 4/Nov/2017
ESC Code .. Reduced acceleration due to d-sync issues, Particularly bad with super high quality batteries.
Gen 2.2 Improved entry to the barrel

Update 16/Nov/2017
Reverted most of the change made in ..."Gen 2.1 reduced the OD of the barrel" It is still smaller that G2.0 though....

Update 1/Dec/2017
Gen 2.5 Removed short barrel to allow of larger ID though the cage.

Update 4/Dec/2017
Added code to support A trimpot to allow the adjustment of MAX RPM/FPS

Update 6/Dec/2017
Updated wiring diagram to reduce interference.
Re-added No brake code and ESC Flash for 4s operation. (To keep it cooler)

Update 10/Feb/2018
Updated wiring diagram. Changed buck to 5V and wiring.


Print Settings


Ttronxy 3A


0.1 For the Cage. 0.1 or lower for the wheels




Was printed in PLA HOWEVER a higher temp plastic would be better.
The wheels NEED each layers start to be randomized to PREVENT a seam !

How I Designed This

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I wanna go ahead and build this too, but I wonder about some things.

  1. does the darts fly straight? high fps is fine but I am afraid that the darts will not be able to fly good with that amount of power
  2. what are the ranges?
  3. will I be able to print it over on i3 pursa mk3 what materials are recommended ? (planning to order one soon)

thank you very very much you have made an awesome work

Hats off to you for prividing such a thorough resource for the next level of flywheel modification. This is fantastic mate, WELL DONE!

I plan on doing this mod using RCX h2205 2950kv motors, since I have a few of those laying around. Link: http://0.klet.st/RCX2205-2950kv Would you minde sharing the original files you designed the cagewheel with? Diameter of the RCX motors is 26.6mm.

Hello i believe we have discussed these motors on the FB page

Hello, can anybody tell me the size of the screws to fix the motors to the flywheel cage ? thanks

I think you'll find the long ones are m3 8mm

okay, let's hope those are given with the motors ! I have a nice build coming, I'll post pics when it's finished ;)

Yeah use the bolts that come with the motors

These are M5 nuts. Be aware that the motors suggested have one with CW threading and one with CCW threating.

I'm a little new to all this but I'm collecting a rapidstrike this evening and wondered whether this mod would fit it?

HI No unfortunately it dose not even come close to fitting... im intending on doing one though... sub scribe to my thingiverse page to receive updates

take a look at this : https://www.thingiverse.com/thing:2561650 he finally released it !

Nerf Rapidstrike Brushless Motor Setup

I've already seen it! Hoping to get a version which suits the motors I have to see how well that turns out

Hi! Do you have recommendations for higher-torque motors (at same RPM or better) without shell cutting still?

Also i could not find any motors at the same or More RPM KV... it is these ones or nothing

The recommended motors are crazy high torque .. instant on..thats why we use out runners and not shell cutting is required

where can I have the code for arduino?

Hi it is part of the Thing files.. i have updated the description to make it all a bit clearer

got it , thanks

How much of a difference did printing in 100 micron vs 200 micron make for the flywheels?

Great designs printed the whole stryfe front end & fits like a glove printing the flywheel cage nxt what do you need to run the motors never used these before always used stock or rhinos

The video was actually longer but i ran out of space on the camera and i didn't notice... Im going to make another video and upload the code here .. but in short emax lightning ESC's and controlled via Arduino .. I haven't done this yet i'll let you know..

Can you upload some pics of your creations as Makes please..

Right new Files and Video Added

hi boss, can i get the stl file for the cage? :D wonderful work btw~

Sorry my bad i have uploaded the wrong file.. I will sorry that out soon

The cage is there, though has the original name of 41.5mm but it is narrower than that

nice :D but i can only see the wheel in the 'thing file' section

yip getting there.. im still at work ..

haha ok boss. thanks for the quick respond :)

Ive uploaded it now... sorry about that

Built something similar a while ago: https://www.youtube.com/watch?v=MxKUhkKXHo8
What kind of electronics did you use? I used 2 ESCs, reflashed them and an extra attiny to supply the pwm signal - very crude but it works good enough that suddenly peace broke out at the office ;)