Hey! This thing is still a Work in Progress. Files, instructions, and other stuff might change!


by LoialOtter, published

NerfTank by LoialOtter Dec 1, 2012




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This is a work in progress of an RC nerf tank I'm working on. It uses some advanced gear designs, printed tracks, mainly printed components overall, will look cool and should be very functional.

This was printed on Tiny, my overly large 3d printer. More info available at https://ottersoft.ca/

Oh, and the gear is supposed to run backwards to push the treads forwards. That is by design... I think it looks cooler that way.

I've got a video on it running now thanks to Marginally Clever (Dan) at Vancouver Hackspace - https://www.youtube.com/watch?v=JJc0kGrgPCs


I use a numbering system with the format so I'll be referring to everything by number.

What you will need (so far):

M4x30mm bolts - socket head x6

M5x25mm bolts - socket head x14

624ZZ bearings - 13ODx4IDx5mm x12

2 sections of treads (http://www.thingiverse.com/thing:35668)

 - you'll need 84 links in total  

Print (please note that some parts may need to be rotated or flipped):

8021-P02 x8 (note that these are different from my other release sprockets)

8021-G01-P01 x2*

8021-G01-P02 x6*

8021-G01-P03 x2*

8021-G01-P04A x2 (mirror one)

8021-G01-P04B x2 (mirror one) - Updated Dec 9th

8021-G01-P05 x2

8021-G01-P06 x2

  • means they can optionally be printed half mirrored but if one is mirrored, all must be (herringbone gears)

Assembly is a bit of a pain but can be done. Make sure all parts are free of stuff first.

To assemble the planetary gear:

1) screw the bearings onto the narrow (straight toothed) end of the planets

2) start with the planets loose with the sun and output ring (the one that engages the track)

3) Place the ring smooth side down and hold the sun around the center of it but up a little

4) angle the planets in so they match up with the centers of both the sun and ring

5) press down so they go flat

6) check against the planet holder, if the teeth are off adjust by twisting needle nose pliers so one point is grabbing the sun and the other the planet that's off (yes, it's a little annoying)

7) Place the bearings into the inside planet holder

8) press the planet holders in on both sides using a flat vice if necessary

9) screw planet holder together

10) Slide gear assembly onto the outside fixed ring with body

The drive may require some wear-in using a drill or other high torque motor.

Assemble the tracks, you'll need 42 links per side.

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how many tread i have to print for one track?

NEED This for Scorpion tank from Halo. Brilliant Idea.

Hi There,

I am a bit of a noob at 3d printing and assessing suitable models / items to print. You mention a 0.5 nozzle for printing this. I have a 0.4mm would i be able to print this okay?

Thanks in advance for both any advice and the upload of your work.



I'm trying to rebuild this myself, and just from looking at your solid work files I don't get how your out put ring meshes with the treads in order to drive the tread around. Do the teeth on the out put ring fit into the spaces between the treads? or how does it work?

Does this automatically fit with your tread design? What scales should I use?

im buildn this for my rc crawlers and was wandering where u got the print for the track. i am very new to this and would love to see this completed. thank you


What size bearings did you use, do you have a drawing of how the drive ring goes together..
Better still do you have a BOM??
I'm printing all the parts now.


All the bearings are 624ZZ. The idlers just run on some screws I found at the hackspace, I do believe they're #10 x 1.5". The gear uses six 624ZZ's held on either side by M4x12 screws. The sun gear is sized to take the gear that came with the motors pressed into it but I don't know their specs at all.

How well do you think this would work at a smaller scale, say 75% or even 50%?

It should work. The gear itself is the only difficult part. If you can cut it out switching it for a different type would work better.

The problem is that the teeth are scaled so they'll work with a 0.5mm nozzle, if you drop the size even a 0.35mm nozzle will have troubles with it. Try it though as you might have better luck than me.

To let everyone else know, I'll still be working on this soon once I get my 3d printers out. They're taking the highest priority for now.

Love it. Which software did you use? If SCAD, could you upload the sources? I'd like to print it at 150% but then would have to modify the wheels etc. for bearing and so on...

I designed all this in Solidworks (sorry)... I've attached a zip of the source files.


Could you upload a zip/rar with all the files in one bunch? Would make it easier to store in HD for later use.

I've attached a zip of all the STLs in one file. As this is in progress I'll try to keep it updated along side or at very least list the changed items so you can download 'em separately.