ERA 3.5" Mini O4 Frame Kit

⚠️ 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 DDP. All duties and taxes included in shipping. 🌍 Non-EU: Price excludes VAT/tax. Import duties may apply. details[open] summary span:last-child { content: "−"; } details summary::-webkit-details-marker { display: none; } details summary::marker { display: none; } 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 Coming 2026: The 3.5-Inch Standard We didn't just build a frame. We partnered with T-Motor and Gemfan to make 3.5-inch freestyle work the way 5-inch works. T-Hobby x it's FPV 1604.5 Motors Proven bell design, but with a brand new 3mm shaft. The scaled-down equivalent of proper 5-inch motors. Lighter than 1604 designs with oversized shafts, more durable than T-mount alternatives. No C-clip to swap bells, just a small M2 screw. Prop swaps feel like 5-inch again. Gemfan Custom 3.5" Props 3mm shaft hole, a purpose-built prop for this motor standard. Our goal: establish the new 3.5-inch standard. We hope other manufacturers adopt these specs so 3.5-inch freestyle becomes genuinely viable, not a compromise. 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