Product image	Product	Total	Quantity
	ERA Mini Mounting Inserts (M3 - M2) $2.00	$2.00

ERA 3.5″ Mini Frame Kit, DJI O4 Pro

ERA 3.5″ Mini Frame Kit

$87.00 USD

Sale Sold out

Camera Cage Style Freestyle

Camera Cage Color: Black

14-day statutory right of withdrawal

⚠️ Before you order - read this +

Frame kit only: Electronics, ELRS antenna holder, and action cam mounts are not included.

O4 Pro version: This version fits the stock DJI O4 Pro plastic housing only.

⚠️ CNC Kit owners: If you've converted your O4 Pro to standard form factor with our 7075 CNC Conversion Kit, you need the standard ERA 3.5" Frame Kit, not this one.

Motor mounting: 12x12mm (M2). Not compatible with 9x9mm motors.

Action cam: The frame supports action cams but adds significant weight at 3.5". For action cam use, we recommend our extended 4" arm set.

🇺🇸 US: Ships duties paid. Duties are added at checkout, nothing is due on delivery.

🌍 Non-EU: Price excludes VAT/tax. Import duties may apply.

The World Opens Up

A basketball hoop. On a 5-inch, you fly around it. At 3.5 inches, you fly through it. FPV feels different when you're this small and this durable. Every gap becomes a line. Every line becomes possible.

This is the O4 Pro Version. Same ERA Mini. Same durability. Built specifically for the DJI O4 Pro camera with stock plastic housing. The larger O4 Pro camera required a redesigned cage and extended bottom plate front. Everything else stays the same.

Full ERA, Compressed

This isn't a stripped-down mini version. It's the complete ERA design philosophy: proven camera protection, compressed X geometry, split deck construction. Scaled to 3.5 inches with zero compromises. Everything that made ERA work, tightened up.

The Cage: Why Injection-Molded Nylon?

The visual signature of the ERA is also its functional core. We don't use aluminum (too rigid) or 3D printing (too weak) for our camera protection. We invested in high-pressure injection molding because our testing proved it superior to every other method. 3D printing creates layers, microscopic weak points where cracks eventually start. Injection molding creates a solid, uniform polymer structure with equal strength in all directions.

Why nylon? It's the same polymer family used in downhill mountain bike pedals and high-end snowboard bindings. Parts that survive thousands of vibration cycles and high-velocity impacts without snapping. TPU is more elastic, carbon is stiffer and can chip on sharp impacts. Nylon sits in between: structural memory to take a hit and keep your camera exactly where you set it. It absorbs impact energy, flexes, and bounces back. It sacrifices itself so your electronics don't have to.

Beyond protection, this solid cage acts as a structural bridge. Combined with our split deck construction, the entire chassis becomes one unified, stiff block that withstands abuse.

The worst cage we've ever seen. One year of bashing by team pilot @scarce_fpv. Still functional.

Action Camera Mounting System

We fly 20°. That's why it's the stock angle. Five mounts available from 10° to 30° in 5° steps. One M3 screw out, swap the mount, done. The cage stays untouched.

Your FPV camera is separate and fully adjustable from 0° to roughly 40°.

The cage supports action cams, but at 3.5" the extra weight changes the flight characteristics significantly. If you want to fly with an action cam, we recommend our extended 4" arm set for better balance and more thrust.

Built Like a Shrunken 5-Inch

Around 300g AUW fully built. Light enough for precision, heavy enough for momentum. The compressed X geometry that made ERA responsive feels even tighter at this scale. Same authority, smaller package.

Bonus: With arms this short, zero props in frame on O4 Pro. Clean footage, every flight.

Hardware You'd Spec Yourself

We build what we fly. That means T700/T800 carbon mix. 12.9 hardened YFS screws that won't strip. 7075 aluminum standoffs that won't bend. 22mm deck height (up from ERA's 20mm) for easier installation without sacrificing rigidity.

Small detail that matters: TPU strap holder locks your battery straps in place between packs. No more loose straps slipping during swaps.

Construction

Arms lock into the frame with a form fit. No slop, no play. The bottom plate is under tension from the center screw, adding stiffness without weight.

Need to access your stack? Leave the camera attached. Four screws out, top plate off, full access. Nothing to realign when you're done.

Every cage is checked by hand. Heat inserts installed with specialized equipment. No batch leaves without personal QA.

Choose Your Version

ERA 3.5" Mini Frame Kit - Analog and DJI V1/O3/O4 Pro CNC Kit
ERA 3.5" Mini Frame Kit O4 - DJI O4 Pro with standard camera housing

The 3.5-Inch Standard

We didn't just build a frame. We worked with T-Motor and Gemfan to make 3.5-inch freestyle work the way 5-inch works.

it's 1604.5 3650KV Motor

Proven bell design with a brand new 3mm shaft. The scaled-down equivalent of a proper 5-inch motor. Lighter than 1604 designs with oversized shafts, more durable than T-mount alternatives. No C-clip. One small M2 screw to swap the bell. Prop swaps feel like 5-inch again.

Gemfan Bash 3.5

Purpose-built for this motor standard. Native 3mm bore, M3 nut, no adapter. Screw on, hex out, fly.

We hope other manufacturers adopt these specs so 3.5-inch freestyle becomes the standard it should have been from the start.

What's Different on the O4 Version

O4 Nylon Camera Cage: Redesigned for the larger DJI O4 Pro camera. Same injection molding process, same durability.
Extended Bottom Plate Front O4: Longer carbon plate to match the O4 cage dimensions.
Updated 3D Prints: O4 VTX Dual Antenna Holder, new TPU camera inserts.

What You're Getting

A frame that won't break in normal freestyle. Camera protection that actually protects. Hardware that won't strip, bend, or fail. A build experience that doesn't fight you. A quad that flies like it should.

Developed by pilots who crash, rebuild, and fly the next day. Every detail comes from real sessions, real crashes, real frustration with how things used to work.

What's in the box +

Every part available as a spare in our store.

Injection-molded

1x Nylon Freestyle Camera Cage

Carbon fiber

1x O4 Mini Bottom Plate Front

1x Mini Bottom Plate Back

4x Mini Arm CF 4mm T700

1x Mini Top Plate CF 2mm T800

1x Mini Interlock CF T700

3D printed

4x O4 TPU Camera Inserts

1x AWG14 + 1x AWG16 Lead Holder

1x O4 Dual VTX Antenna Holder

1x Mini Battery Strap Holder

1x ERA VTX Antenna Holder

4x ERA Mini Mounting Inserts (M3 - M2)

All 3D printed parts available as free STL downloads on the product pages.

Hardware

2x 22mm Standoffs 7075

1x Hardware Set

Full screw list +

11x 8mm M3 Buttonhead 12.9

16x 7mm M2 Buttonhead 12.9

4x 20mm M3 Countersunk 12.9

4x 14mm M2 Countersunk 12.9

1x 22mm M3 Countersunk 12.9

5x M3 Pressnut

4x M3 Lock nut V2A

4x 18mm M2 Caphead 12.9

4x 7mm M2 Caphead 12.9

4x 6mm M2 Caphead 12.9

4x 4mm M2 Caphead 12.9

4x Lock nut M2 Aluminium

4x 9mm M1.6 Caphead 12.9

3x 6mm M2 Countersunk

Miscellaneous

1x Mini Ultra Sticky LiPo Pad

2x Nylon-kevlar Battery Straps

4x Mini Skids

Specs

What's inside.

Standoffs

7075 Aluminum

Frame geometry

Compressed X | 168mm wheelbase

Hardware

12.9 hardened steel

Prop clearance

Fits up to 3.6" props

Stack mounting

M2 25.5x25.5mm | M3/M2 20x20mm

Motor mounting

M2 12x12mm

Camera mounting

Up to 20x20mm

VTX mounting

20x20mm | 25.5x25.5mm

Frame

What makes ERA durable.

Carbon

T700/T800 | Up to 55% stronger than typical FPV frames

Camera cage

Injection-molded nylon | Impact absorbing

Battery straps

Nylon-kevlar | Won't snap on impact

LiPo pad

Super sticky | Keeps battery in place

Action camera angle

Fixed 20° (adjustable via mounts 10-30°) | One M3 screw

Bell protection

Three point motor bell protection

Skids

FDM printed | Protects arms on landing

Arm swap

One screw arm swap

Action cam swap

One screw action camera swap

View full details

Vastly more compact

ERA Mini opens up a new library of flight spots that are physically inaccessible or too dangerous for a full-sized rig. At this scale, the physics of flight change in your favor. By dropping the hazardous weight and volume, you remove the 'threat factor.' This allows for stress-free proximity flying in sensitive areas where a full-sized rig would be a liability.

Yet, unlike lighter micros, ERA Mini retains enough mass to carry momentum through the air. It avoids the floaty feeling of smaller copters, offering the locked-in trajectory of a big rig, just condensed. Every gap becomes wider, and every line becomes possible.