Weird grinding sound

[OpRaider]

So I had a revo 3.3 and the nitro engine broke and there around 200 bucks for a new one. So I did some research and found electric conservation kit and I 3d printed the morter mount and I think the spur in grinding but i don't know I will get a clip of it the motor and esc are some cheap eBay ones
Youtube link-

 

[Tunedfrog]

Welcome in, sounds exactly like a smoked spur gear.

 

[OpRaider]

Welcome in, sounds exactly like a smoked spur gear.

I thought the same thing but it new

 

[nino]

If you didn't set the mesh properly, it could have stripped right away...

 

[OpRaider]

Maybe I will buy some more later and try

 

[ground_zero298]

Why don’t you pull the cover off and record the spur?

 

[OpRaider]

Why don’t you pull the cover off and record the spur?

I will try when I get home from work

 

[OpRaider]

So you guys are right the spur gear is bad but dose anybody know where to get a metal gear