Measured geometry of real objects.
150 objects. Dimension sheets free (CC BY 4.0). 1446 STEP/STL parts free, generated from the standards. Public CAD indexed with its license. Measured scans of devices on the way. How it's made · MCP + API for agents · Pricing
NASA and Sunpower free-piston Stirling references (public domain) and design numbers5 sizes★ freeStirling engine configurations: which type needs which parts on this shelf14 sizes★ free
Can-engine printed kit: can caps, diaphragm clamps, displacer guides, crank stands, CD/platter hubs, syringe cradles7 sizes★ 23 files
LTD (low-temperature differential, coffee-cup) Stirling kit: plates, chamber ring, displacer, top plate with syringe cylinder6 sizes★ 9 files
Alpha V-twin: 90° two-pin crank discs, V block, transfer tee3 sizes★ 5 files
Crank discs, connecting rods and flywheels for model engines3 sizes★ 15 files
Motion mechanisms: Scotch yoke, swash (wobble) plate, eccentric + strap, Geneva, four-bar links, bell crank, rack7 sizes★ 27 files
Ratchet wheels and pawl (anti-reverse / one-way drive)4 sizes★ 4 files
Rhombic drive kit (Philips beta Stirling): twin crank gears, links, yokes, frame7 sizes★ 10 files
Ross yoke kit (alpha Stirling with parallel cylinders)5 sizes★ 6 files
Free-piston Stirling core: displacer, power piston, liner, gas spring, stops, clearance-seal and tuning tables3 sizes★ 11 files
Moving-magnet linear alternator kit (free-piston Stirling power take-off)6 sizes★ 7 files
Planar spiral flexure bearings (Sunpower / NASA free-piston style): Ø40–120, DXF + STEP5 sizes★ 30 files
Axial-flux alternator kit: magnet rotor plates, 3-phase stator, coil bobbins, hall RPM pickup6 sizes★ 6 files
Instrumentation: DS18B20 and K-type probes, hall sensor, encoder disc, dial-indicator stems6 sizes★ 7 files
Printer calibration coupons: hole, pin, nut-trap, T-slot tongue and bearing-pocket gauges7 sizes★ 8 files
Regenerator and heat materials: stainless mesh counts, steel wool, scrubbers, mica, fiberglass, ceramic, firebrick9 sizes★ 5 files
Tea lights, maxi tea lights and votives (heat sources)3 sizes★ 3 files
Thermoelectric (Peltier) modules: TEC1-12706, 12710, 30 mm4 sizes★ 3 files
Fluidyne (liquid-piston Stirling) manifold and tees for 1/2 in copper U-tubes4 sizes★ 2 files
Thermoacoustic stacks (slicer-infill blanks, spiral), resonator lengths and a speaker driver cap for tri-clamp spools3 sizes★ 16 files
Tri-clamp (Tri-Clover) sanitary ferrule, 1/2 to 4 inch8 sizes★ 8 files
Tri-clamp displacers and engine heads: 1.5, 2 and 3 in spools9 sizes★ 46 files
Tri-clamp end cap and gasket, 1.5 and 2 inch2 sizes★ 4 files
Tri-clamp spool (two ferrules on a tube), 1.5 and 2 inch7 sizes★ 7 files
Button head socket screws, M2–M8 (ISO 7380)7 sizes★ 35 files
Countersunk socket screws, M2–M8 (ISO 10642 / DIN 7991)7 sizes★ 35 files
Dowel pins, 2–6 mm (ISO 2338 / DIN 6325)5 sizes★ 23 files
Flat washers, M2–M8 (ISO 7089)7 sizes★ 7 files
Heat-set threaded inserts, M2–M6 (for 3D prints)6 sizes★ 6 files
Hex nuts, M2–M8 (ISO 4032)7 sizes★ 7 files
Imperial machine screws: #4-40, #6-32, #8-32, 1/4-204 sizes★ 18 files
Nyloc lock nuts, M2.5–M8 (DIN 985)6 sizes★ 6 files
Set screws (grub screws), M3–M8 (ISO 4026)5 sizes★ 27 files
Socket head cap screws, M2–M8 (ISO 4762 / DIN 912)7 sizes★ 47 files
Threaded standoffs, M2.5 and M3 (hex and round)2 sizes★ 16 files
Aluminium beverage cans: 12 oz standard, 16 oz, 330/500 mL, sleek, slim, mini7 sizes★ 7 filesBalloons, gloves, inner tubes and silicone sheet as diaphragms5 sizes★ free
CDs, DVDs and hard-drive platters as flywheels4 sizes★ 4 files
Craft sticks, skewers, coat-hanger and paper-clip wire, BBs, marbles, ping-pong balls, zip ties9 sizes★ 10 files
Laboratory rubber stoppers #0–#13 and wine corks16 sizes★ 17 filesMason jars: regular (70 mm) and wide-mouth (86 mm), half-pint to half-gallon6 sizes★ freePET bottle necks: PCO 1881 (soda, 28 mm) and 38 mm (milk/juice)3 sizes★ free
Plastic syringes 1–60 mL as pistons and cylinders7 sizes★ 7 files
Steel food cans: soup, vegetable, tuna, #2, #2½, #10, coffee8 sizes★ 8 files2020 aluminum extrusion20×20 mm★ free
Aluminium T-slot extrusion: 2020, 2040, 2060, 2080, V-slot, 3030, 3060, 4040, 4080, 1010, 151516 sizes★ 16 files
DIN rail, 35 mm (TS35 × 7.5, EN 60715)6 sizes★ 2 files
T-slot attachments: slide-in and drop-in T-nuts, corner brackets, gussets, end caps, slot covers, feet, hole plates7 sizes★ 46 files
Neodymium disc magnets, common sizes6 sizes★ 6 filesO-rings, common metric sizes (ISO 3601)7 sizes★ free
608 ball bearing7×22×22 mm★ 2 files
Ball bearings, 683 to 6210 and flanged F6xx (ISO 15)44 sizes★ 44 files
Bearing housings and linear supports: KP08, KFL08, SK8, SC8UU, V-wheels, sleeve bushings6 sizes★ 13 files
Clevis pins, R-clips, cotter pins, clevises, universal joint, rod ends (heim joints)6 sizes★ 23 files
Compression, extension and torsion springs: sizes, rate formula, printed envelopes8 sizes★ 8 files
DC motors: 775, N20 gearmotor, TT gearmotor3 sizes★ 3 files
Flexible shaft couplers, 5–10 mm bores6 sizes★ 6 files
GT2 timing pulleys, 16T–60T (2 mm pitch)7 sizes★ 7 files
LM8UU linear bearing and 8 mm rod24×15×15 mm★ 2 files
MGN9 / MGN12 / MGN15 miniature linear rails and carriages8 sizes★ 17 files
NEMA 17 stepper motor42.3×42.3 mm★ 3 files
NEMA 8, 11, 14, 23 and 34 stepper motors6 sizes★ 10 files
Roller chain sprockets: #25 (6.35 mm) and #35 (9.525 mm), 10–40 T12 sizes★ 12 files
Shafts, D-flats, set-screw collars, E-clips (DIN 6799) and circlips (DIN 471)22 sizes★ 32 files
T8 lead screw and brass nut (Tr8×8, 2 mm pitch 4-start)3 sizes★ 7 files
19-inch rack units and mounting ears (EIA-310)7 sizes★ 2 filesGoPro-style three-finger mountsheet pending★ free
VESA mount hole patterns: 75, 100, 200×100, 200×200, 400×2005 sizes★ 5 files16 mm and 19 mm panel-mount push buttons6 sizes★ free
Panel cutouts: IEC inlet, rockers, barrel jack, USB-C, HDMI, LEDs, Neutrik D11 sizes★ 10 filesUSB-C receptacle (16/24-pin, mid-mount)8.94×3.26 mm★ free
Schedule 40 pipe and PVC fittings, 1/2 to 2 inch6 sizes★ 6 files
Silicone and PU tube, hose barbs and push-fit fittings (the transfer port)13 sizes★ 22 filesMilwaukee M18 battery interfacesheet pending★ sheetscan soon
Borosilicate test tubes, 10×75 to 30×200 mm11 sizes★ 11 files
Copper pipe (ASTM B88 Type L and M), 1/4 to 2 inch8 sizes★ 8 files
Hobby brass tube (K&S), 1/16–21/32 in and 1–12 mm, telescoping32 sizes★ 32 files
Pipe thread envelopes: NPT (ANSI B1.20.1) and BSP (ISO 228 / 7), 1/8 to 1 inch6 sizes★ 12 files
Spur gears, involute 20°: module 0.5, 1 and 2, 12–60 teeth21 sizes★ 21 files
Adafruit LiPo batteries, battery holders, chargers and boost converters26 sizes★ 26 files
2.54 mm pin headers, 1×2 to 2×20, vertical and right-angle30 sizes★ 30 files
Board connectors: USB Micro-B, Mini-B, RJ45 jack, microSD socket, barrel jacks6 sizes★ 6 files
JST PH, XH, EH and GH connectors, 2–8 pin41 sizes★ 41 files
Pluggable terminal block headers: Phoenix MSTBA / MSTBVA 2,5 (5.0 / 5.08 mm), 2–6 positions20 sizes★ 20 files
Screw terminal blocks: Phoenix MKDS 1,5 and MKDS 3 (5.0 / 5.08 mm), 2–6 positions15 sizes★ 15 files
USB-C / micro-USB breakouts, panel-mount USB, DC jack, magnetic connectors, microSD breakout, Perma-Proto and breadboards27 sizes★ 27 files
Adafruit handhelds and kits: Circuit Playground, PyBadge, PyGamer, PyPortal, CLUE, MagTag, Funhouse, Monster M4sk, HalloWing, Matrix Portal, Qualia, Fruit Jam22 sizes★ 22 filesAmazon Echo Dot (5th gen)100×100×89 mm★ sheetscan soonApple TV 4K (3rd gen, 2022)93×93×31 mm★ sheetscan soonDualSense (PS5), Xbox Wireless Controller, Switch Pro Controller, Joy-Con, Switch 2 Joy-Con 25 sizes★ sheetscan soonEcho (4th gen), Echo Pop, Echo Show 5, Google Nest Mini, Nest Hub, HomePod mini, HomePod (2nd gen)7 sizes★ sheetscan soonFlipper Zero100×40×25 mm★ freeNintendo Switch 2, Switch OLED, Switch (2019), Switch Lite4 sizes★ sheetscan soonRing Video Doorbell (2nd gen, 2020)126×62×28 mm★ sheetscan soonValve Steam Deck (LCD)298×117×49 mm★ free
Buzzers and beepers: 12 mm, 15 mm magnetic; TDK PS1240 piezo7 sizes★ 7 files
NeoPixel rings, sticks, jewel, matrices and RGB LED matrix panels16 sizes★ 16 files
Speakers, amplifiers and microphones: 3 in, 40 mm, enclosed, STEMMA speaker, MAX98357, I2S/PDM mics17 sizes★ 17 files
Through-hole LEDs: 3, 5, 8, 10 mm, flat-top, rectangular, RGB28 sizes★ 28 files
Trimmer potentiometers: Bourns 3296, 3266, 3339, 300611 sizes★ 11 filesAdafruit Feather (standard form factor)50.8×22.86 mm★ free
Adafruit Feather boards and FeatherWings28 sizes★ 28 files
Adafruit Metro (Uno form factor), Metro Mini and Grand Central (Mega form factor)6 sizes★ 6 files
Adafruit PiCowbell boards and Pico cases10 sizes★ 10 files
Adafruit QT Py, ItsyBitsy, Trinket, GEMMA and Trinkey boards18 sizes★ 18 filesArduino Mega 2560 R3101.52×53.3 mm★ freeArduino Nano (classic and Nano Every)45×18 mm★ freeArduino Uno R368.6×53.4 mm★ freeEspressif ESP32-DevKitC55×28 mm★ freePJRC Teensy 4.035.6×17.8 mm★ freeRaspberry Pi Pico51×21×1 mm★ freeRaspberry Pi Pico 251×21×1 mm★ freeSeeed Studio XIAO (all variants)21×17.5 mm★ free
Adafruit Raspberry Pi HATs and Bonnets (PiTFT, Motor HAT, RGB Matrix, BrainCraft, Speaker, Joy, CRICKIT…)20 sizes★ 20 files
Adafruit STEMMA QT sensor breakouts (BME280, BNO055/085, VL53, SCD-40, AHT20, SHT40, IMUs, light, magnet, RTC…)33 sizes★ 33 files
Adafruit displays: OLED, TFT, e-ink, 7-segment and matrix backpacks20 sizes★ 20 files
Character LCDs (1602, 2004), 128×64 graphic LCD, 0.96 in OLED, 7-segment displays12 sizes★ 12 filesFlipper Zero Wi-Fi Developer Boardsheet pending★ freeFramework Expansion Card32×30×6.8 mm★ freeRaspberry Pi Camera Module 325×24 mm★ free
Servos, DC and stepper motors, solenoid, motor drivers (Adafruit-sold parts)22 sizes★ 22 filesGoogle Pixel 10, 10 Pro, 10 Pro XL, 9 series, 9a, 8 series10 sizes★ sheetscan soonSamsung Galaxy S25, S25+, S25 Ultra, S25 Edge, S25 FE, S24 and S23 series11 sizes★ sheetscan sooniPhone 14, 13, 12 series, SE (3rd gen) and 1114 sizes★ freeiPhone 15, 15 Plus, 15 Pro, 15 Pro Max (2023)4 sizes★ freeiPhone 16, 16 Plus, 16 Pro, 16 Pro Max (2024)4 sizes★ freeiPhone 17, iPhone Air, iPhone 17 Pro, 17 Pro Max, iPhone 16e (2025)5 sizes★ sheetscan soon
PCB relays: Songle/SANYOU SRD, Omron G5V, G2RL, G6K, Finder 40, Schrack RT14 sizes★ 14 filesNVIDIA Jetson Orin Nano Developer Kit103×90.5×34.77 mm★ freeRaspberry Pi 4 Model B85×56 mm★ freeRaspberry Pi 585×56 mm★ freeRaspberry Pi Compute Module 455×40 mm★ freeRaspberry Pi Zero 2 W65×30 mm★ free2.5-inch drive (SATA SSD / HDD)100×69.85×9.5 mm★ free
Arcade buttons, tactile and metal buttons, toggles, joysticks, thumbsticks, potentiometers, rotary encoders22 sizes★ 22 files
Tactile buttons (6 mm), DIP switches and small slide switches21 sizes★ 21 filesiPad Pro (M4), iPad Air (M3), iPad (A16), iPad mini (A17 Pro)6 sizes★ freeAirPods Pro 2 / Pro 3, AirPods 4 and AirPods 3 charging cases4 sizes★ freeApple Watch Series 10/11 (42, 46 mm), Ultra 2/3 (49 mm), SE (40, 44 mm)5 sizes★ free
18650 lithium cell65×18×18 mm★ 1 files
21700 lithium cell70×21×21 mm★ 1 files
AA and AAA cells50.5×14.5×14.5 mm★ 2 files
CR2032 coin cell3.2×20×20 mm★ 3 files
Lithium cells: 14500, 16340, 18350, 26650, 326507 sizes★ 5 files120 mm axial fan120×120×25 mm★ free40 mm axial fan40×40×10 mm★ free
Axial fans, 25 to 140 mm: frames and hole patterns10 sizes★ 12 files1950s tabletop tube radio (form library)sheet pending★ sheetscan soonVintage radio and hi-fi knob setsheet pending★ sheetscan soon


































































































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