Premium, sim-to-real optimized 3D armor
for the Pollen Robotics Microduck. Transform your robot with lightweight, CAD-accurate aesthetic shells. Zero balance disruption. Engineered using public MuJoCo simulation meshes for flawless physical compatibility.
Instant digital deliverySigned 24-hour link
The armory
Every kit ships the same physics discipline: weighed parts, validated 5% infill profiles, and editable STEP sources. Pick a single shell for the shelf — or take the whole library and retrain your policy in MuJoCo before you print.
Aggressive sci-fi plating with zero balance tax.
One-time · Instant download
Community vibes, printed in about two hours.
One-time · Instant download
Every shell, every STEP body, plus the MuJoCo asset pack.
Save $26.98 · Instant download
One-time payment · no subscriptionSwipe to compare →
| Feature | Cyber-Mecha Tactical ShellPremium · $19.99 | Hugging Face Mascot KitPremium · $6.99 | Developer's VIP BundleDeveloper Kit · $19.99 |
|---|---|---|---|
| STL print files | ★ | ★ | ★ |
| Native STEP sources | ★ | ★ | ★ |
| MuJoCo .obj asset pack | — | — | ★ |
| Mass + center-of-mass sheet | ★ | ★ | ★ |
| 5% lightning infill profiles | ★ | ★ | ★ |
| Future drops included | — | — | ★ |
Files are delivered instantly. If a mount does not align with the stock frame, we refund or re-cut the part.
Secure checkout by Stripe
The physics problem
Aesthetics are easy. Aesthetics that survive contact with a policy trained at 240 Hz are not. Every design includes exact gram weights, recommended 5% lightning infill print profiles, and native STEP files so advanced devs can train their models inside MuJoCo before printing.
Every gram moves the center of mass
Bolt a 90 g aesthetic shell onto a 1.2 kg duck and your policy is now controlling a different dynamical system. It stumbles inside one gait cycle.
Infill roulette
A 20% gyroid print can weigh three times the geometry you validated in sim. With no baseline profile, every builder ends up with a different robot.
STL-only storefronts
No STEP source means mounts get reverse-engineered in a mesh editor at 2 a.m. — and the fit is still an approximation.
No bridge back to simulation
Without mass, inertia and collision hulls you cannot retrain before burning a spool of filament on a shell that never had a chance.
Gram-accurate mass budget
Every part ships with its measured mass and a center-of-mass sheet you can paste straight into your MuJoCo body definition.
5% lightning infill baseline
Each kit includes the exact 5% lightning profile we simulate against, so the printed mass matches the modelled mass instead of drifting away from it.
Native STEP with named bodies
Edit a mounting boss, re-export, reprint. Bodies are named to match the simulation model — not Shell_014, Shell_015, Shell_016.
MuJoCo assets in the box
The Developer Kit adds decimated .obj visual meshes, convex collision hulls and the inertial table you need to retrain your walking policy.
We model each shell as a mass-bearing body on the stock torso frame, then verify the bundled print profile reproduces the modelled mass within a few grams. If your policy is sensitive to a smaller delta than that, step down the infill — the sheet tells you the resulting mass.
Sim-to-real workflow
Aesthetic shells are usually authored as art, not as mass. DuckArmor kits are authored as bodies: measured grams, named STEP features and a collision hull you can validate before the first layer goes down.
Pull the assets
Download the STEP library and the MuJoCo .obj pack from your library. Bodies arrive named to match the simulation model.
Re-verify in sim
Drop the shell into your Microduck model, read the COM delta from the sheet, and retrain if your reward is sensitive to it.
Print the validated geometry
Slice with the bundled 5% lightning profile. No scaling, no supports on mating faces, no post-processing the frame.
Prefer a single shell? Every kit still ships its STEP source and gram sheet.
duckarmor_sim.xml
MuJoCo 3.x
<mujoco model="microduck_cybermecha"> <compiler meshdir="duckarmor/meshes" angle="radian"/> <asset> <mesh name="torso_shell" file="cybermecha_torso.obj"/> <mesh name="head_visor" file="cybermecha_visor.obj"/> <mesh name="shoulder_cap" file="cybermecha_shoulder.obj"/> </asset> <worldbody> <body name="torso" pos="0 0 0.24"> <freejoint/> <!-- measured kit mass at 5% lightning infill --> <geom name="shell_torso" type="mesh" mesh="torso_shell" mass="0.038"/> <geom name="shell_visor" type="mesh" mesh="head_visor" mass="0.006"/> <!-- stock XL330 harness, untouched --> </body> </worldbody></mujoco>From the community
Feedback from builders who measure their mods instead of eyeballing them.
Fits perfectly over the Dynamixel XL330 framework without throwing off the center of mass!
I retrained my policy with the VIP Bundle meshes before printing. First physical roll-out, zero stumbling. That never happens.
The STEP files are the actual product. I moved the IMU mount in 20 minutes instead of rebuilding a shell from scratch.
sim2real sam
@sim2real_sam · 2d
Printed the Cyber-Mecha shell at 5% lightning. 38 g on the scale, ~1 mm COM shift in my model. My walking policy genuinely did not notice. This is how robot mods should ship.
Maya builds robots
@mujoco_maya · 5d
The STEP source is the underrated part. Named bodies, no Shell_014 nonsense. Remounted the IMU before my coffee went cold.
duckbuilds
@duckbuilds · 1w
My Microduck has a personality now. Lab mate walked past and asked which render engine I used. It's PETG, my guy.
Objection handling
Still unsure? Message us before you buy — we would rather answer a fit question than process a refund.
Every kit is modelled against the public Microduck MuJoCo body meshes and mounts to the stock Dynamixel XL330 frame using the original fasteners. If a printed mount does not seat correctly, we refund the order or re-cut the part.
It can, which is why mass is documented instead of guessed. Full kits land between 12 g and 50 g depending on the shell and infill. The included sheet lists per-part grams and the modelled centre-of-mass delta, so you can decide — and the VIP Bundle ships the MuJoCo assets to retrain if your policy is sensitive.
Stripe confirms the payment, your access is granted immediately, and we email a signed, time-expiring download link (24 hours by default). The purchase is also pinned to your library permanently — sign in with the same email any time for a fresh link.
No. Files are standard STL and STEP, so you can send them to a print service, a local makerspace, or your own machine. The 5% lightning infill profile ships as both Cura and PrusaSlicer presets.
PETG for the tactical shells, matte PLA for the mascot kit. Both are validated at a 0.4 mm nozzle, 0.2 mm layers, three walls and 5% lightning infill. Anything hotter or denser changes the mass — check the sheet first.
Personal use plus small-batch commercial printing of physical parts. You may sell the parts you print. You may not resell, redistribute or republish the STL, STEP or simulation files.
Digital goods are generally non-refundable once downloaded, but if a file is corrupt, a mount misses, or you picked the wrong kit, email us within 30 days and we will make it right.
No. DuckArmor is an independent project. We design against publicly documented geometry and ship no proprietary Pollen Robotics or Hugging Face assets.
Pick a shell, or take the whole library with the MuJoCo asset pack. Files land in your inbox in seconds and stay in your library forever.