3D-printable automotive, RC & hobby parts
Car inserts, RC bumpers, slot-car bodies, drone guards and hobby parts with real dimensions. Browse what makers built, or describe the exact part you need and Printy makes it.
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ArachnoLock — Terrarium Hatch
An ultra-secure, screw-to-seal hatch system designed for terrariums with a 50mm pre-drilled feed hole. The three-piece design sandwiches the 5mm glass top to stay permanently in place, offering a heavy-duty threaded plug that no occupant can muscle through. Features Captive Setup: A flanged collar and a locking nut clamp firmly across the glass thickness. Tapered Seal: The screw cap seats into a matching taper, ensuring a zero-play, gapless seal. Integrated Lid Handle: The 25mm high grip block provides enough purchase to unscrew the cap or lift the entire terrarium panel. Spider-Proof: Sturdy 3mm threads and a flush seal mean nothing pushes its way out. Dimensions Fits hole: Ø 50mm Clamps to plate thickness: 5mm Thread size: M49x2.5 (Collar), M40x3 (Cap)
StatQuad — Mechanical TTRPG Tracker
A compact, 4-row mechanical stat counter. This model features a fully integrated print-in-place leaf spring and cam system designed specifically for FDM limits. Features 4-Row Array: Eight numbered dials grouped into four rows, displaying double-digit values. Mechanical Detents: Leaf springs elevated off the baseplate by 0.5 mm ensure each dial clicks into position precisely and won't fuse to the floor during printing. Low Profile: The housing is optimized to sandwich the gears with just a fraction of a millimeter of Z clearance. Print notes Print without supports — the 0.5mm gap under the leaf springs will bridge cleanly. Fine layer height (0.12 - 0.16 mm) is recommended for the digits and detent nubs.
Glue-On Skewer Tunnel
Gluing a stick directly to a flat chassis usually snaps off instantly because there's just no surface area. This low-profile block provides a large flat footprint for chassis adhesion and a deep horizontal tunnel to keep the skewer locked perfectly straight. Fitment Skewer tunnel: 3.2 mm diameter, runs horizontally front-to-back. Footprint: 12 mm wide by 25 mm long, perfectly flat for double-sided tape or CA glue. Print ready: Prints flat as oriented, no supports needed.
Ember — Realistic Miniature Fire Helmet
A heavily detailed half-inch miniature fire helmet designed for dioramas or RC figures. Features Structural Details: Features radial dome ribs and a pronounced central crest reflecting classic firefighting gear. Badging: Includes a forward-tilted front shield bearing a 3D-embossed "10". Profile: Features a realistic rear-swept brim with a raised outer lip to channel water. Hollow Core: Built thin-walled with an open base to slide cleanly over a mounting post or miniature figure's head.
One piece Lego compatible fit roof for E44 style loco
A custom monolithic spanning piece built for standard interconnecting block systems. It features two continuous 26-stud curved roof sections (matching a 15068 profile) separated by a sunken two-stud central channel. The central channel is dropped by one standard plate height (3.2 mm), allowing the next layer of parts to sit flush below the curve peaks. The underside features a full 6x26 cavity equipped with 125 interlocking tubes. Integrated structural cross-ribs connect the entire undercarriage, providing genuine rigidity and ensuring a tight clutch across a massive 208 mm span.
Drone Landing Legs
What it's for A set of standalone tapered landing legs for a custom quadcopter or drone project, giving clearance for an under-slung battery or payload. Dimensions Height: 37 mm total ground clearance. Base Diameter: 12 mm resting footprint. Top Diameter: 6 mm where they meet the frame. Print notes Print flat on the build plate. No supports are needed for the tapered cylinders.
Micro Quadcopter Frame with Skids
A lightweight unibody quadcopter frame designed for micro builds. Central Chassis: Hollowed core with standard mounting clearances for electronics. Motor Mounts: Integrated cups sized for 7x16mm coreless motors. Landing Gear: Separate skid-style legs printed alongside the main frame. The frame sits flat on the plate for an easy print without supports.
Veloce — Differential Line Follower Chassis
Veloce is a purpose-built 3D-printable platform engineered for high-speed differential line following. To hit the aggressive 160×130mm envelope without compromising on handling, the architecture mounts the Arduino Mega and battery in a transverse layout right over the drive axle. This keeps rotational inertia extremely low, allowing the twin N20 gearmotors to snap the chassis through sharp 90-degree turns without oscillating. The front features a modular, underslung sensor bracket that drops the PCB down to track level while heavily protecting the leading edge. Wide slots allow you to mechanically dial in the RLS-08's asymmetry so the IR array sits dead-center on the robot's axis. Features Transverse Core: Mounts the Mega 2560 and 2S battery pack sideways to pull the mass closer to the axle. Modular Drive Mounts: Mirrored left/right N20 brackets hold the gearboxes rigidly by the faceplate, completely decoupling chassis stress from the motor bodies. Underslung Sensor Tray: Drops the RLS-08 directly into the 3mm sensing zone without exposing the PCB to front-impact damage. Wire Routing: Integrated zip-tie holes and defined component zones (BMS, Buck, Driver) keep high-current lines separated from signal paths. Compatibility The hole pattern and cutouts are specifically tailored for: Arduino Mega 2560 (Transverse) 2× N20 Geared DC Motors & 42mm Drive Wheels SmartElex RLS-08 Line Sensor 2S 18650 Battery Holder, 2S BMS, LM2596 Buck Converter, and TB6612FNG Driver 35mm Flanged Ball Caster
Terrarium-Deckel mit Futterluke
Vogelspinnen brauchen frische Luft, aber der Ausbruch beim Füttern muss verhindert werden. Normale Plastikboxen taugen dafür ab Werk wenig. Dieser Ersatzdeckel löst beide Probleme: Er bringt ein flächendeckendes Raster für maximale Belüftung mit und hat eine separate Futterluke, die per Pin sicher verschlossen wird. Die Klemmlippe an den Innenseiten sorgt dafür, dass der Deckel sauber in der Box einrastet. Außenmaß: 196 × 158,5 mm Wandstärke: 2,25 mm Futterluke: 30 mm Durchmesser Druck: Flach auf dem Druckbett liegend (Top-Down) für ein optimales Finish ohne Stützstrukturen. Der Pin wird ebenfalls ohne Support gedruckt.
Line Follower Chassis (N20/Mega)
A flat-printing, modular chassis designed specifically for high-speed line following. Engineered to accommodate an Arduino Mega 2560, dual N20 motors, and a Pololu QTR-8RC reflectance sensor, with priority placed on a low center of gravity and straightforward field maintenance. What it's for This frame carries the electronics and drive system for a 2WD differential steering robot. Components drop into dedicated regions rather than requiring complex brackets, and all sensitive electronics are kept clear of the track surface. The front sensor mount separates from the main plate to allow independent height tuning of the IR array. Dimensions Overall envelope (assembled): 180 mm (L) × 130 mm (W) × 55 mm (H) Track width: ~90 mm, providing clearance for 35–38 mm diameter wheels. Electronics rails: Slotted cross-members accept an Arduino Mega or similarly sized microcontrollers. Drive mounts: Drop-in snap/strap cradles for standard 12×10 mm N20 motors. Power bay: Sized for two parallel 18650 lithium cells (44 mm inner width) with integrated Velcro pass-throughs. Assembly All major features anchor with standard M2 or M3 hardware. The front skid and sensor bracket print flat independently and bolt into designated sliding rails on the chassis nose. The motor mounts include under-plate zip-tie channels to secure the gearboxes rigidly against torque. Use standoffs for the motor driver and buck converter pads to ensure proper wiring clearance above the deck.
Apex — Comp Line-Follower Chassis
Apex — Comp Line-Follower Chassis is a high-speed, 3D-printable robotic platform designed around the Arduino Mega 2560 and Pololu QTR-8RC. Built for aggressive track layouts and rapid differential steering, this design drops the center of gravity to the floor while tightly packaging the critical electronics. The front sensor array dictates the pacing, and the custom split-bracket mounting system allows micro-adjustments in both height and lead distance to optimize line acquisition. Features Adjustable QTR Mount: Two-axis bracket for fine-tuning the 8-channel array height and lead distance. Low-CG Differential Drive: Transverse 2S battery pocket and dual N20 saddles centered on a 3mm rigid base plate. Component-Mapped: Exact clearances for the Arduino Mega 2560, TB6612FNG driver, buck converter, and 35mm racing wheels. Wire Routing: Integrated chassis cutouts and zip-tie points to keep logic and power rails out of the wheels. Print notes Print the main chassis and brackets in PETG or rigid PLA+ at a 3mm shell thickness. The chassis is natively support-free. Use M2 hardware for the sensor array and M3 for the logic boards and motor saddles.
Retro TV Enclosure for No-Solder RP2040 Builds
A two-piece retro TV shell designed to house a no-solder RP2040 video player. The clamshell locks together with a built-in snap fit, offering exactly 150×80×50mm of internal space. Both halves print flat on the bed without supports. Front Bezel: Features a sloped CRT-style screen cutout with an internal ledge for a 2.8" display, twin 7mm dial holes, and integrated speaker vents. Back Shell: Includes a bottom-edge USB-C cutout and classic rear cooling vents. Snap Fit: A 4mm friction lip with interlocking bumps holds the enclosure securely together.
Bearings
A standalone print-in-place ball bearing inside a 22x22mm square housing. Designed originally to mount axles on a scratch-built mousetrap car chassis, the housing is completely flat on the back so you can glue or strap it exactly where you need it. Inside, the inner ring rides on twelve captured micro-spheres, keeping friction low without requiring external hardware. Tuning hooks Clearances: The internal track has a 0.4mm clearance gap. If your printer fuses them, try dropping the flow rate slightly. Axle bore: The center hole is 4mm — size it up to fit standard 1/4" or 6mm dowels if you're building heavier. Mounting: The 22x22mm block has plenty of meat around the edges if you want to drill through for M3 bolts.
Brompton Seatpost Bumper Cap
What it's for A custom TPU end cap for the seatpost of a Brompton folding bike. It acts as a resilient plug to prevent the folded bike from rolling, and pads the ground against scratches when the post is dropped. Dimensions Fitment: Engineered with 30.2 mm ribbed sections for a secure interference fit inside a 29.6 mm seat tube. Bumper Pad: 34.5 mm diameter to cleanly cover the 33 mm seatpost rim, featuring a 3 mm solid base section to take impact. Core: Deeply hollowed center for weight reduction and necessary wall flexibility, paired with a central pressure-relief hole to ensure clean seating without trapped air popping the plug loose. Print notes Intended for flexible materials like TPU. The thin-wall hollow structure allows the ribs to compress inwards on insertion, maintaining outward spring tension to hold the cap firmly in place.
Nautical Shield Speaker Guard
This rugged radial shield evokes the heavy-duty machinery of an old trawler, ready to protect delicate marine audio gear from stray knees, errant ropes, and the open elements. The design features a raised central dome to house protruding tweeters, flanked by deep structural spokes that provide rigid impact resistance across a 6.5-inch footprint. Design Notes Clearance: Central raised hull provides 12mm of breathing room for integrated tweeters. Mounting: Four 45-degree offset countersunk holes drop right onto a 155mm pitch circle. Structure: Two internal concentric rings tie the radial spokes together to prevent flexing under pressure. Printability: Lays flat on the build plate; print in ASA or PETG for outdoor UV and temperature resistance.
TrailCam — MTB Helmet Mount
A universal, strap-on action camera mount designed specifically for vented mountain bike helmets. The underside features a gentle spherical dish to sit stably against the curved crown of a helmet without wobbling, while wide side slots accept standard velcro loops or zip ties to lock it through the shell vents. Features Standard 3-Prong: Fits all standard action camera housings and thumbscrews. Captive Nut Boss: The right prong is thickened to hold a standard M5 hex nut, making field adjustments simple. Universal Base: The 48x40mm footprint spans most helmet ridges, and the strap slots are dimensioned for thick reusable zip-ties or standard 20mm velcro straps.
Space Command Console Toy
The keyboard belongs to you. The TV remote belongs to you. The oven dials are strictly off limits. But they still want to press buttons, and everything they reach for has a consequence. This console solves that. It’s a chunky, slanted control panel built to take a hammering. The throttle is a captive slider that prints fully in place—no assembly, just crack it loose and it glides. The giant red and green buttons sit on thin printed hinges, giving them enough flex to feel like a real press without needing actual springs or hardware. The dials and radar screen are solid topographic features that add tactile feedback without weak points. Printing Notes Dimensions: The base fits squarely on a 180x130mm footprint. Print-in-Place Clearance: The slider runs in an internal T-slot with a generous 0.5mm clearance on all sides, making it easy to free up on almost any FDM machine. Orientation: Designed to sit entirely flat on the build plate. The 13-degree slope of the panel is built into the geometry, so the internal bridges and tracks print parallel to the bed. Settings: Standard 0.2mm layer heights work beautifully. Three perimeters recommended to keep the compliant button hinges tough.
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A compact, print-in-place traveling nut mechanism designed to mount onto a 15mm diameter shaft. This stopper locks rotation exactly at 900 degrees (2.5 turns) in either direction. The inner blue sleeve slides over your 15mm shaft and secures with a standard M3 bolt and captive nut, while the outer orange traveler moves up and down the internal threads as the wheel turns. Fitment and Constraints Host Shaft: 15mm diameter. The bore is modeled at 15.2mm to allow for a snug fit. Rotation Limit: Exactly 900 degrees (2.5 turns), enforced by rigid top and bottom flanges. Assembly: Print-in-place. The mechanism prints fully assembled with 0.4mm radial clearance in the threads, permanently capturing the traveler nut between the outer flanges so it cannot back off. Installation Requirements: You must have a fixed block or housing wall nearby for the traveler nut's side tab to ride against; this prevents the nut from simply spinning with the shaft and forces it to travel linearly.
Utilitarian Chassis Flight Skids
This lightweight hardware suite is designed for custom chassis builds, keeping the overall footprint low while providing a sturdy base. The components are arranged flat on the build plate for easy, support-free fabrication. Flight Hardware The Deck: A 50×55 mm central mounting plate. It features a solid 2 mm deck surrounded by a 3 mm retaining wall, ideal for corralling electronics or batteries. The Skids: Twin 50 mm long landing legs. They have been heavily cored out to reduce mass, leaving just a rugged 3 mm footprint and sturdy outer struts to handle hard landings.
1/24 Scale Linear Ramp
1/24 Scale Linear Ramp. A straight wedge built for indoor carpet use, featuring a 45mm rise over a 200mm run. The deck is cut with 1.5mm traction grooves to give foam or rubber tires something to bite on, and the underside is hollowed out around three longitudinal trusses to prevent deck deflection without wasting material. Fitment Checks Track Width: The ramp face is exactly 150mm wide. Check your chassis track width — anything over 130mm is going to struggle to stay completely on the deck. Scale: Designed for 1/24 or 1/28 scale chassis (SCX24, Mini-Z, etc.). It is generally too narrow for 1/16 scale and will absolutely not fit 1/10 scale. Clearance: Approach lip is 1.5mm thick.
Steel-Profile Tank Trap
A classic Czech hedgehog tank trap, scaled for RC crawler courses, tabletop dioramas, or just sitting on a desk. Built from three intersecting L-beams around a solid center block, it’s oriented to stand securely on three legs with the bottom tips sliced flat for better plate adhesion and stability on hard surfaces. Remix & Scale Hooks Dimensions: Currently set to a 75mm span with 8mm wide, 1.5mm thick beams. This is a great sweet spot for 1/24 scale crawlers. Beam Profile: Uses standard angle-iron (L-beam) shapes. You could swap these for I-beams or square tubes if you want a different structural look. Pairings: Scale it up 200% for 1/10 scale RC rigs, or print a handful at the default size to scatter across a gravel pit or desk mat.
Solid Core Quadcopter Frame
A solid unibody quadcopter frame designed to hold four micro drone motors. Features: Solid central chassis block Swept structural arms Motor mounts with clearance for 8.5mm motors Unified 8mm frame thickness with 7.5mm arms
160mm Wheelbase Truck Chassis
Base structure for the Moroccan Unity Day modular parade truck. Built to carry standard 6mm axle rods and accept top-deck cabin and cargo payloads. This is a specific-fit frame, not a universal runner. Check the axle bore and mounting distances before committing filament: Axle Bores: 6.3mm teardrop channels, printed horizontally. Fits 6mm rod axles with 0.3mm clearance. Wheelbase: 160mm exactly. Deck Mounts: Eight 5.3mm bores spaced for the matching Unity Day cabin and cargo blocks (5mm locating pegs). Overall Footprint: 270mm x 105mm x 25mm. Prints top-down or bottom-up depending on your preference for bridging, but the internal grid is fully pocketed to drop weight while keeping the deck rigid. Minimum wall thickness is locked at 2.5mm for an easy two-wall pass on a 0.4mm nozzle.
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