Mechanical Parts
Screw Generator by Koolm
Metric and inch screws, nuts and washers with real thread specs, made on MakerWorld
Mechanical Parts · 142 generators · 118 free
Gear, knob and part generators
A gear generator turns a tooth count, a module and a bore size into a printable STL, and the same approach works for knobs, screws, springs, pulleys, hinges and jar lids. You type in numbers from the part you need to replace or fit, and the tool draws the geometry.
The 20 most popular gear, knob and mechanical part generators compared
Browse all 142 by type| Generator | Best for | Price | Account | Exports | Multicolor |
|---|---|---|---|---|---|
| Screw Generator by Koolm | Replacement and custom fasteners | Free | Needed | STL, 3MF | No |
| Gear Generator by Koolm | Replacement gears and gear trains | Free | Needed | STL, 3MF | No |
| Underware 2.0 Cable Management Customizer | Hiding cables under desks and on Multiboard | Free | Needed | STL, 3MF | Yes |
| Duplicate Your Keys | A backup or reference copy of your own Kwikset or Yale house key | Free | Needed | STL, 3MF | No |
| Gear Generator 3 | Designing and testing gear trains | Paid | Not needed | STL, OBJ, SVG | No |
| Spring Generator by Koolm | Light-duty custom springs | Free | Needed | STL, 3MF | No |
| Bearing Generator by Koolm | Printed bearings for toys, spinners and prototypes | Free | Needed | STL, 3MF | No |
| Ultimate Gear Parametric Generator (ZJUN_3D) | Replacement gears and small gear drives | Free | Needed | STL, 3MF | No |
| 10 Inch Mini Rack Generator | Homelab mini rack shelves | Free | Needed | STL, 3MF | No |
| Universal Smartphone Case Generator | Cases for phones with no ready-made options | Free | Needed | STL, 3MF | No |
| Grille Generator by Koolm | Replacement vent covers, drain covers and pipe caps | Free | Needed | STL, 3MF | No |
| Pulley Generator by Koolm | Belt-driven builds and printer repairs | Free | Needed | STL, 3MF | No |
| Customisable Propeller Generator | Custom props for RC planes, boats and drones | Free | Needed | STL, 3MF | No |
| Cable Raceway Cover & Channel System (Parametric) | Hiding cords along walls and desks | Free | Needed | 3MF | No |
| CADAM | Functional printed parts from a plain-English description | Freemium | Needed | STL, OBJ, GLB, FBX | No |
| Customizable Keycaps (AEKI) | Novelty emoji and letter keycaps for Cherry MX keyboards | Free | Needed | 3MF, STL | Yes |
| Thread Generator by Koolm | Custom threaded rods and lead screws | Free | Needed | STL, 3MF | No |
| Cosmos Keyboards | DIY ergonomic split keyboards shaped to your hands | Freemium | Not needed | STL, STEP, GLB | No |
| Vacuum Nozzle - Round or Flat Tip (John_M) | Replacement and narrow crevice tools for home, car and shop vacuums | Free | Needed | STL, 3MF | No |
| Propeller Generator by Koolm | RC props, fan blades and spinning toys | Free | Needed | STL, 3MF | No |
All 142 gear, knob and mechanical part generators
Mechanical Parts
Gear Generator by Koolm
Spur, ring, bevel, crown and worm gears plus racks, all from one MakerWorld form
Mechanical Parts
Duplicate Your Keys
Printable backup copies of Kwikset and Yale house keys made from the key code
Mechanical Parts
Bearing Generator by Koolm
Print-in-place ball, roller or dumbbell bearings in 60+ standard sizes or your own dimensions
Mechanical Parts
Gear Generator 3
Gear designer and simulator in the browser or as a desktop app; exports need a pass or a 45 EUR lifetime license
Mechanical Parts
Spring Generator by Koolm
Compression springs with variable pitch, dead coils and flat ends, ready to print
Mechanical Parts
Ultimate Gear Parametric Generator (ZJUN_3D)
Spur, helical, bevel, crown, worm, rack and ring gears from one MakerWorld form
Mechanical Parts
Grille Generator by Koolm
Vent grilles, drain covers and pipe caps sized to your opening in MakerWorld's customizer
Mechanical Parts
Pulley Generator by Koolm
Timing belt pulleys for GT2, HTD, MXL, XL and T-series belts with custom bores
Mechanical Parts
Customisable Propeller Generator
Propellers for RC planes, boats and drones, shaped from NACA airfoil profiles
Mechanical Parts
Customizable Keycaps (AEKI)
Up to nine Cherry MX style keycaps, each with its own letter, emoji or symbol in a second color
Mechanical Parts
Thread Generator by Koolm
Threaded rods and nuts in ISO, trapezoidal, ACME, buttress or square profiles
Mechanical Parts
Vacuum Nozzle - Round or Flat Tip (John_M)
Slip-on vacuum nozzles with a round or flat crevice tip, sized to your own vacuum pipe
Mechanical Parts
Cosmos Keyboards
Curved split keyboard cases you can fit to a scan of your hand, with free STL export
Mechanical Parts
Propeller Generator by Koolm
Propellers, fans and rotors with NACA airfoil blades, set by size, pitch and blade count
Mechanical Parts
End Plug Generator (WardCons)
Push-in end plugs for round, oval, square and rectangular tubes, sized to your tube
Mechanical Parts
Hinge Generator (Maochen)
Print-in-place screw-on hinges in your own size, set from eight measurements on MakerWorld
Mechanical Parts
Connector Generator by Koolm
Multi-arm tube, pipe and rod connectors with custom sockets, angles and fit
Mechanical Parts
Hole Cover Cap - Customizable
Ribbed push-in caps and plugs sized to your rectangular, square, round or pill-shaped hole
Mechanical Parts
[FLAT] Articulated Finger Extensions
Wearable jointed finger extensions sized from your own finger measurements
Mechanical Parts
Flat Hinges Generator
Customizable flat hinges that open to 360 degrees and print without supports
Mechanical Parts
Bracket Generator by Koolm
Angle, flat, T and straight mounting brackets with your own screw hole grid
Mechanical Parts
Customizable Gasket/Seal Ring Generator
Custom flat gaskets and seal rings in round, oval, square or rectangular shapes
Mechanical Parts
Chainmail - Customizable Tool
Printable chainmail sheets set by rows, columns and layers, with the rings already linked
Mechanical Parts
Measuring Cup / Spoon (Matthew Ghost)
Measuring cups and scoops in the volume you type, with the size in raised letters on the handle
Mechanical Parts
Parametric Grommet Generator
Two-piece press-fit cable grommets sized to your panel hole, made in a MakerWorld customizer
Mechanical Parts
O-Ring Generator by Koolm
O-rings and seal rings from AS568 size presets or your own metric sizes, in five cross-sections
Mechanical Parts
Ostat Hose & Pipe Adapter Generators
Free browser generators for vacuum hose adapters, tool port fittings and funnels
Mechanical Parts
Parametric Electronics Panel Generator
Front panels with cutouts for switches, USB, fans and displays, plus labels
Mechanical Parts
Ruler Maker by Koolm
Custom metric or inch rulers with your own ticks, numbers, logo and keychain eyelet
Mechanical Parts
Threaded Lid Generator
Replacement screw-on caps for jars and bottles from four simple measurements
Mechanical Parts
VentForge - Parametric Vents, Covers & Diffusers
Vent grilles, insect mesh, covers and disc-valve diffusers sized to your wall opening
Mechanical Parts
Any Size Parametric 90 Degree Shelf Bracket
L-shaped shelf and corner brackets sized to your boards and your screws
Mechanical Parts
Measuring Cup / Measuring Spoon Generator (Maochen)
Measuring spoons and scoops in any milliliter size, with the volume on the handle
Mechanical Parts
Parametric Side-Release Buckle 10-60mm
Two-part side-release buckles for 10 to 60 mm straps, cords and paracord
Mechanical Parts
Wall Plug Generator (EBdesign)
Custom-size printable wall plugs, 4 to 18 mm wide and 25 to 100 mm long, with or without a collar
Mechanical Parts
Custom End Cap Generator for Square/Rectangle Tube
Press-in end caps for square and rectangular metal tubes, sized from four measurements
Mechanical Parts
Parametric Nut Caps & Knobs System
Nut caps, grip knobs, furniture feet and screw covers sized for M1 to M16 hardware
Mechanical Parts
The Ultimate Funnel Generator
Funnels sized to your bottle or tank, with an optional brim, loop and angled spout tip
Mechanical Parts
Drywall Anchor with Opening Wings
Printable drywall anchors with fold-out wings, sized to your screw and wall
Mechanical Parts
Cable Grommet Wall Pass-Through Cover (parametric)
Round wall cover for a cable hole, sized to your hole and cable in a MakerWorld customizer
Mechanical Parts
Parametric Removable Headrest Hook
Clip-on car headrest hook for 12.7 to 14.1 mm posts, with your own hook length and height
Mechanical Parts
bracket.engineer
Free power brick bracket sized to your adapter, to screw under a desk or on a wall, exported as 3MF
Mechanical Parts
Customizable Servo Horn
Servo horns with your choice of arm count, arm length, holes and spline fit
Mechanical Parts
Customizable Gasket / O-ring Maker
O-rings, rectangular enclosure seals and 2-bolt flange gaskets, with optional bolt holes
Mechanical Parts
D Shaft Knob Generator
Custom knobs for D-shaft potentiometers and encoders with an indicator line
Mechanical Parts
Button Generator (WardCons)
Replacement sewing buttons in the shape, size and hole layout you choose
Mechanical Parts
Evolvent Design 3D Gear Generator
Spur gear generator from a gear specialist; STL download unlocked via Patreon
Mechanical Parts
Keycap Generator (srwi)
Multi-color keyboard keycaps with your own letters or icons, saved as 3MF files
Mechanical Parts
Keycap Legend Generator (Vostok Labs)
Mechanical keyboard keycaps with your own icon, logo or letter as a two-color legend
Mechanical Parts
Meshcast Candle Mold Maker
Wraps a printable two-part box mold around your model for pouring wax, soap or resin
Mechanical Parts
MIKE - Bicycle Mount Generator (ETH Zurich)
Custom bike mounts for lights, cameras and bike computers, built from two parts you pick
Mechanical Parts
Parametric O-Ring Generator (Canale)
Simple O-ring maker: set the inside and outside diameter and the thickness
Mechanical Parts
PCB Forge
Turns an SVG circuit drawing into a printable two-part mold for copper-tape PCBs
Mechanical Parts
printastencil.com
Solder paste stencils for PCBs from KiCad Gerber or SVG files, as a printable STL
Mechanical Parts
solder-stencil.me
Free solder paste stencil maker: upload the Gerber paste and outline layers, get a printable STL, no account
Mechanical Parts
Stenchill
Solder paste stencils for your circuit board, printed from its Gerber files
Mechanical Parts
alpaco.it Gear Generator
Meshing spur, helical or herringbone gears set by module and teeth, with shaft fittings
Mechanical Parts
alpaco.it Hose Adapter Generator
Round hose and port adapters between any two diameters, with elbows up to 90 degrees
Mechanical Parts
Astromar Bahtinov Mask Generator
Free Bahtinov focusing mask sized to your telescope from four numbers, as an STL, no account
Mechanical Parts
Bearing Generator (osuushi)
Tiny free web form that makes print-in-place bearings with a clearance setting and a cross-section preview
Mechanical Parts
Cavity (Genform)
Turn any STL into printable rigid or silicone mold pieces with sprues and vents; Genform account and plan
Mechanical Parts
Clamp Generator for Pipe and Tube (OwlCAD)
A printable C-clamp or two-plate clamp with a V-jaw cut for a named pipe, conduit or tube size
Mechanical Parts
Compression Spring Generator (OwlCAD)
A printable coil spring from wire size, diameter, length and coil count, always one solid body
Mechanical Parts
Connector Foundry
Free browser library of 36 mounting parts for Gridfinity, openGrid, Skadis, GoPro and more, as STL, no account
Mechanical Parts
Washer and Spacer Generator (Vostok Labs)
Washers and spacers to any inner diameter, outer diameter and thickness, made in MakerWorld
Mechanical Parts
Cut Craft (3D PrintCraft)
Free tool that cuts a large model to fit your printer bed, with butterfly keys, pins or magnet joints, no account
Mechanical Parts
Designer Bee Clock Hands Generator
Custom hour, minute and second hands for a quartz clock movement, exported as a printable STL
Mechanical Parts
Eurorack Panel Designer
Eurorack synth front panels with datasheet-sized part holes, exported as STL
Mechanical Parts
Fit Test Coupon Generator (OwlCAD)
One test print that tells you how much clearance your printer really needs for a joint
Mechanical Parts
Focus Rings
Free follow focus gear for any camera lens, sized from its diameter, plus paid clamp rings and lens caps
Mechanical Parts
Follow Focus Gear Customizer by trinckle
Closed-ring follow focus gears sized to your camera lens, downloaded as an STL
Mechanical Parts
Follow Your Focus
Free follow focus ring gears sized to your camera lens, with chamfers and grub screw holes; STL, no account
Mechanical Parts
Gear Model For 3D Printer (knowhave)
Free browser tool for spur, rack, planetary, bevel and worm gear sets, exported as STL
Mechanical Parts
GearGen-3D
Free open-source browser generator for seven gear types, with involute teeth and STL, STEP and DXF export
Mechanical Parts
GenerateSTL
Gears, screws and nuts, print-in-place bearings, boxes, grilles and pegboards as STL
Mechanical Parts
Hose Adapter (ilove3d)
Free browser generator for hose adapters and elbows up to 135 degrees from measured diameters
Mechanical Parts
Lithium Pack Designer
Web calculator that plans an 18650 or 21700 battery pack and exports a printable cell holder
Mechanical Parts
Lovcad
AI text to CAD: describe a part in plain words and get a parametric model with real dimensions
Mechanical Parts
Modelador 3D Paper Embossing Roller Generator
Free kit for a hand-cranked paper embossing roller with your text, logo or motif on matched rolls
Mechanical Parts
Modelador 3D Part Generator
Portuguese-language hub of nearly 60 free part generators for bolts, gears, bearings, pulleys and more
Mechanical Parts
Modelador 3D Two-Part Mold Generator
Turn a closed STL into a printable two-part mold with a split plane, alignment pins, a pour funnel and vents
Mechanical Parts
Mold Craft (3D PrintCraft)
Upload a 3D model and get a printable two-part mold for soap, wax or plaster, as STL or 3MF; paid plan
Mechanical Parts
Mold Studio
Turns an STL into a printable two-part casting mold with alignment pins, a pour sprue and air vents
Mechanical Parts
Neo Gear
Free spur and helical gear generator with profile shift and keyed, D, hex or square bores, as STL or 3MF
Mechanical Parts
Open Mouthpiece
Free saxophone mouthpiece designer with real tip, facing and chamber settings, STL download, no account
Mechanical Parts
PartForge
Describe a part in words, a photo or a sketch and get parametric CAD with sliders, exported as STL, 3MF or STEP
Mechanical Parts
Paws & Parts Print-in-Place Chain Generator
Support-free print-in-place chains, from tiny jewelry links to heavy chunky ones
Mechanical Parts
PCB THT Holder
Turns a photo of your circuit board into a printable jig that holds through-hole parts while you solder
Mechanical Parts
PipeFitter
Adapters that join two pipes or hoses, with bends, barbs, flanges and slip joints
Mechanical Parts
Planetary Gearbox Generator (OwlCAD)
A printable planetary gearbox from tooth counts, with a live check that the planets will fit
Mechanical Parts
Platonic
Free browser generator for dowel connectors that build Platonic and star polyhedra frames, as STL, no account
Mechanical Parts
Print-in-Place Ball Bearing Generator (OwlCAD)
A ball bearing that prints already assembled, picked by trade size from 2 mm to 60 mm bore
Mechanical Parts
Print-in-Place Ball Joint Generator (OwlCAD)
A ball-and-socket joint that prints assembled, or a stack of them as a poseable arm
Mechanical Parts
Print-in-Place Pin Hinge Generator (OwlCAD)
A knuckle hinge with a captive pin that prints pre-assembled and moves straight off the plate
Mechanical Parts
PrintPal Mold Box Generator
Free two-part mold box for silicone or resin casting around your model, with keys, a pour spout and vents
Mechanical Parts
Rack and Pinion Generator (OwlCAD)
A straight gear rack with a meshing pinion, placed on the rack and ready to print
Mechanical Parts
RC Wheel Model Studio
Free RC car wheel generator with 14 car presets, hex hub, spokes and tire bead channels, as an STL, no account
Mechanical Parts
STL Playground Furniture Leveling Wedge Builder
Tapered shims sized to the exact gap under a table, cabinet or appliance, no supports
Mechanical Parts
Timing Belt Generator (OwlCAD)
A closed toothed belt as one seamless loop, sized to the two pulleys it runs on
Mechanical Parts
Timing Pulley and Sprocket Generator (OwlCAD)
A GT2 or HTD timing pulley or an ANSI #25 to #60 chain sprocket, picked by standard name
Mechanical Parts
Torque
Free browser generator for 3D printable metric screws, nuts and washers from M2 to M20
Mechanical Parts
Custom Spacer / Standoff Generator (nassworks)
Round, hex or square spacers and standoffs in sets, with flange, counterbore or nut trap
Mechanical Parts
Worm Drive Generator (OwlCAD)
A worm and worm wheel for a compact, high reduction, with the ratio and center distance worked out
Mechanical Parts
ZZ Mesh
Cut any model into sealed, printable pieces with pin, dovetail or magnet connectors, in the browser
Storage
Underware 2.0 Cable Management Customizer
Made-to-measure cable channels for under desks and Multiboard, built on MakerWorld
Storage
10 Inch Mini Rack Generator
Mini rack shelves sized to your switch, mini PC or NAS, for 10 and 6 inch racks
Boxes
Universal Smartphone Case Generator
Fitted TPU phone case for any phone you can measure, with your own port and button cutouts
Storage
Cable Raceway Cover & Channel System (Parametric)
Snap-together cable raceways and connectors sized to your cords on MakerWorld
Boxes
Parametric PCB Enclosure Generator
Enter your board size and holes, get a printable electronics case with lid
Storage
Under Desk Cable Clip
Print-in-place cable clips for under a desk, sized to your cables, with 0 to 5 screw holes
Storage
CageMaker PRCG (Parametric Rack Cage Generator)
Free rack-mount cage for any small device in 10 or 19 inch and mini racks, made in OpenSCAD Playground in the browser
Customizers
Iteration3D
Type your sizes to get tube adapters, O-rings, brackets, boxes and organizers as STL
AI to 3D
Loftsmith
Describe a functional part in a sentence and get an editable, print-checked parametric model
Puzzles & Games
Part Designer (LEGO Technic-compatible parts)
Build custom LEGO Technic-compatible beams and connectors from blocks and save an STL
AI to 3D
PrintPal CAD Agent
AI chat that turns a plain description or sketch into a functional part with size sliders
AI to 3D
Printytron
Describe a part in plain English and get a printable STL built to your measurements
AI to 3D
Prompt2CAD
Describe a functional part in plain words and get a dimensioned CAD model to print
AI to 3D
Zookeeper (Zoo Text-to-CAD)
Describe a part with its measurements and get an editable CAD model to export as STL
Boxes
3D Print Calcs
Free, ad-supported site with seven simple STL generators for lidded boxes, Gridfinity bins, pots and spacers
Customizers
3D Print Generator
Slider generators for boxes, fitted cases, gears, screws and vent grilles, plus text to CAD, with paid STL export
Customizers
3DGEN
Browser generators for casting molds, cutters, keychains and lithophanes, STL or 3MF; free tier with a small mark
Customizers
BuildYour3D
About 200 form-based configurators for workshop parts and adapters, with paid STL downloads
Customizers
Car Mount Phone Holder Generator
Free car phone holder fitted to your phone, case and charging plug, with Brodit and AMPS mounts; STL, no account
Boxes
EnclosureAI (3D MakerBench)
Free electronics enclosures built around a real board, with standoffs, port cutouts and vents, as STL or OBJ
Customizers
Forgent3D Generators
Eight free browser generators for Gridfinity, boxes, hose adapters, gears and washers
AI to 3D
Formo
Describe a part in a chat and get a checked STL, 3MF or STEP file, plus free parametric templates
Customizers
Genstrio
Free, open-source hub of 12 parametric generators for enclosures, gears, Gridfinity and more, as STL, 3MF or STEP
Keychains
Keychain Carabiner Set (Vostok Labs)
Snap-hook clip, chain and charm that print flat in one job, with a working swivel and print-in-place chain
Boxes
LittleBoxes.ai
Free browser designer for boxes, lids, brackets and holders sized to your measurements
Customizers
Lunar Prototypes
Fit-to-measure brackets, bins, repair parts and toys you size with a web form
Storage
openGrid Studio
Custom-shaped openGrid wall boards, cable channels and rails, built in the browser
AI to 3D
OwlCAD AI 3D Generator
Describe a part and get an editable parametric model where every dimension is still a number
Customizers
OwlCAD Customizers
35 free parametric generators in the browser, from gears and bearings to Gridfinity bins and jars
Storage
Pegboard Hook Generator (3D MakerBench)
Free hooks, shelves, tool holders and bins for pegboard, SKADIS-style boards and French cleats, as STL
Customizers
PILED 3D CAD Multi Tool
Paid desktop app on Steam with over 100 parametric generators and utilities, exporting STEP, 3MF, STL and DXF
Customizers
Printaro Tools
More than 360 free parametric generators, from name keychains and cryptexes to Gridfinity bins and brackets
Storage
Screw-On Power Strip Holder (Vostok Labs)
Under-desk holder for a power strip, sized to your strip and desk thickness in MakerWorld
Storage
Skadisgen (SKÅDIS Peg Generator)
Free tool that adds IKEA SKADIS pegs to your own STEP or STL model, in snug, normal or loose fit
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About gear, knob and mechanical part generators
For gears, STLGears and Gear Generator 3 run in the browser with no account. STLGears is free, while Gear Generator 3 lets you design for free and animate a whole gear train to check ratios, but needs a paid pass to export a file. Koolm's generators on MakerWorld cover spur, ring, bevel, crown and worm gears, timing belt pulleys, compression springs and metric or inch screws, nuts and washers. For household fixes, the Threaded Lid Generator makes a new cap for a jar or bottle from four caliper measurements, and the D Shaft Knob Generator fits the D-shaped shafts on potentiometers, encoders and appliance controls. The Parametric Electronics Panel Generator makes front plates with cutouts for switches, USB ports and displays.
Measure with calipers, print one test part and adjust the clearance before you print a batch. Print functional parts in PETG or PLA with extra walls, add heat-set inserts where screws go in and out, and keep loads light: printed threads and springs are much weaker than steel.
Mechanical Parts: what to buy
The generator does the design. These materials make the print look as good as the preview.
PETG for functional and outdoor prints
PETG handles heat, sunlight and repeated flexing better than PLA, so Gridfinity bins in a hot garage or signs mounted outdoors keep their shape.
- Bambu Lab PETG Basic (affiliate link) Upgraded formula that Bambu says matches PLA Basic for strength while staying impact-tough; low price per spool in multi-roll bundles.
- Polymaker PETG (affiliate link) High-flow replacement for PolyLite PETG: strong, low-odor and quick to print. In Europe? Buy from 3DJake (affiliate link)
Code gives 15% off your first order at Polymaker.
- Overture High Speed PETG (affiliate link) Good-value PETG in a large color range for functional parts in bulk.
M3 heat-set inserts and installation tips
Brass heat-set inserts give printed parts real metal threads that survive repeated screwing, and a dedicated insertion tip keeps each insert straight and flush.
- ruthex M3 threaded inserts RX-M3x5.7 (100 pcs) (affiliate link) Brass inserts made for 3D-printed plastic, with matching ruthex soldering-tip sets.
- CNC Kitchen Heat Set Insert M3 x 5.7 (100 pcs) (affiliate link) Double-knurled, lead-free brass; CNC Kitchen also sells an installation tip set for T18/900M irons.
- Bambu Lab Heat-Stake Nut Tool Tip Set Insertion tips with an optional USB-C soldering-iron bundle; pairs with Bambu's M3 brass inserts.
M3 screw assortment
M3 is the default fastener size for printed enclosures, hinges and mounts; a sorted kit of lengths saves a hardware-store trip whenever a model calls for bolts.
- Bambu Lab Fastener Kit Mixed self-tapping and machine screws with nuts, matched to Maker's Supply projects.
- Hilitchi M3 socket head cap screw assortment kit (affiliate link) Classic boxed M3 assortment with nuts and washers in many lengths.
Also handy
Digital calipers
Filament dryers and dry boxes
- SUNLU FilaDryer S4 (affiliate link) Amazon
- Polymaker PolyDryer (affiliate link) Polymaker
Some of these are affiliate links: we may earn a small commission, at no extra cost to you. More about that
Mechanical Parts: common questions
How do I 3D print a replacement gear?
Count the teeth and measure the outside diameter with calipers. For a standard metric spur gear, the module is that diameter divided by the tooth count plus 2. Enter those values and the bore in STLGears or Koolm's Gear Generator, both free, keep a 20° pressure angle unless the gear is an older design, and print a test gear.
Can I 3D print a replacement screw, nut or jar lid?
Yes, for light loads. Koolm's Screw Generator makes metric M2 to M24 and UTS #4 to 7/8 inch screws, nuts and washers to ISO, DIN and UTS dimensions, so a printed nut can fit a real bolt. For a lost cap, the Threaded Lid Generator works from four measurements: major and minor thread diameter, pitch and lid height.
What filament should I use for printed gears and mechanical parts?
PETG is a safe default. Prusa rates it for use below 80 °C, while PLA softens above about 60 °C. The author of Koolm's Spring Generator recommends PETG over brittle materials such as matte PLA, and the Flat Hinges Generator's author suggests PETG, ABS or ASA, or a fiber-filled PETG-CF for hinges that see heavy use.
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