Separate STL files for each part plus a 3MF ready for Bambu Studio and OrcaSlicer, with colors assigned and printing instructions included. Open formats only: no proprietary project file.

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Free 3D print generators. Type the dimensions, print the part.

Thirty-six parametric generators for 3D printing. Enter the numbers your project needs, watch the model update live, and download STL and 3MF files any slicer opens. No wizards, no cloud lock-in.

Pick a generator Browse 645 ready models

36generators
645ready-made sizes
STL + 3MFopen formats
0sign-ups needed

Generators

Pick a generator

Each one does a single thing properly. Open it, type your numbers, download. Most take under a minute from first click to files.

Rugged box with snap latches and a printed ball-joint hinge

Storage Rugged Box A tough box with a lid, described in numbers instead of drawn. You type the dimensions; the generator works out the fit, the snap-together hinge and the latches.

Gridfinity bin with two compartments, scoop fronts and a stacking lip

Storage Gridfinity Bins and baseplates on the open 42 mm standard: exactly the size your drawer of parts needs, mating with every Gridfinity print out there.

Electronics enclosure with USB-C, HDMI and RJ45 cutouts, lid lifted above the standoffs

Electronics Electronics Enclosure A project box that fits your board instead of the other way round: pick the board, place the port cutouts on the walls, add vents: done.

Twisted star-section vase generated for spiral vase mode

Home Vase & Planter Vases and planters built from a silhouette and a cross-section (circle, polygon or star) with a shape guarantee that spiral/vase mode cannot fail on.

Layer-swap 3D print of an alpaca artwork on a card

Art & signs 3D Image Turns 2D artwork into a multicolor 3D print using the layer swap trick: the picture sits in the bottom layers and the base color covers it from above.

Drawer organizer tray with six compartments and finger notches in the dividers

Storage Drawer Organizer Measure the drawer, type the numbers, divide the space your way: a tray that drops in with no slack, because it was made for YOUR drawer.

Herringbone gear pair: a 24-tooth gear and a 12-tooth pinion with bores

Workshop Gear Real involute gears: module, tooth count, pressure angle and helix are yours to set. Spur, helical or herringbone, with bore, keyway, hub and a matching pinion.

Printed M8 hex bolt standing on its head next to a matching hex nut

Workshop Bolt & Nut Printable fasteners in any size: metric bolts with hex or thumb heads, matching nuts, washers and threaded rods. ISO presets M3 to M24, custom pitch, left-hand option.

Electronics Keycap Mechanical keycaps with an MX mount: pick a size and profile, put text or an SVG on top as a flush multicolor inlay, print without supports.

J coat hook with mounting bar and reinforcing web

Home Wall Hook A hook that fits your wall: J, U cradle, L shelf or peg, with the mounting holes exactly where your studs are: shaped like the classics, printed the smart way.

45-degree hose adapter elbow with grip ribs inside the mouth

Workshop Hose Adapter The adapter that exists nowhere: YOUR vacuum to YOUR sander, any diameter to any diameter: the search that used to end in an hour of Thingiverse takes a minute.

Curved lithophane plate unlit next to its backlit preview showing the photo

Art & signs Lithophane A photo told in wall thickness: thin glows, thick shades. Classic white, or full colour with cyan, magenta and yellow layers for an AMS or MMU. Looks like a ghost on the shelf: until you put a light behind it.

Two-color nameplate with flush inlay letters, border and screw holes

Art & signs Sign Type the text, pick the finish, print the sign: the plate sizes itself and the letters can be a perfectly flat second color.

Name keychain with fused letters, split-ring hole and flush two-color inlay

Art & signs Keychain A name, a ring, five minutes of printing: fused-letter contour or a neat tag, with flush two-color letters if you have an AMS.

3D-printed stamp with a knob handle, printed face down

Art & signs Stamp Text or a logo becomes a stamp: the face-down print mirrors the die for you, and the live preview shows the imprint before you commit.

Paint stencil plate with the word GARAZ and automatic bridges holding the letter centers

Art & signs Stencil Text or a logo becomes a spray stencil: every island bridged automatically, sprayed result previewed before you print.

Round coaster with a flush two-color monogram and accent rim

Home Coaster A monogram, a name or a logo on a coaster with a genuinely FLAT two-color face: the glass sits level, the rim catches the condensation.

Threaded storage jar with a knurled lid screwed on

Storage Threaded Jar A jar whose lid actually screws on: coarse multi-start threads that print without supports and open in two-thirds of a turn, like a real food jar.

Knurled PET bottle coupler with internal threads at both ends

Home PET Cap Caps that fit real bottles: PCO-1881, PCO-1810 and 38 mm necks: spare caps, hanging eyelets, and a coupler that screws two bottles into one container.

SKÅDIS pen cup and buttressed tool hook with drop-lock tabs

Storage Pegboard Accessory Hooks, cups, shelves and tool racks that click into IKEA SKÅDIS or classic US 1/4″ pegboard: support-free connectors sized to the real boards.

Cable saddle clamp, four-channel desk comb and snap clip

Workshop Cable Clip Clips sized to YOUR cable: screwed saddles, snap clips, desk combs and clamp-on edge clips: printed flat so the snap flexes where FDM is strong.

Star, wing and knurled knobs with hex pockets for metric hardware

Workshop Knob Star, wing and knurled knobs over real M3–M10 hex hardware: the pocket swallows a store-bought bolt or nut and any screw becomes tool-free.

Slatted rectangular vent cover and round honeycomb fan grille

Workshop Vent Grille Vent covers and fan grilles sized to your opening: hex, slats, holes or rings, with the open-area percentage computed so the fan behind it can breathe.

Batch of hex standoffs, round spacers and washers

Workshop Spacer Spacers, standoffs and washers for M2–M8 screws: round or hex, any height, the whole batch laid out in one file. The part you need the night before.

Purple TCG deck box with magnet pockets and its cap

Tabletop TCG Deck Box Deck boxes sized to your sleeves and card count (unsleeved to double-sleeved Commander) with a sliding lid, a click cap or a magnet cap.

Print-in-place hinged box lying open with barrel knuckles and snap tab

Storage Hinge Box Boxes that print in ONE piece, flat and open: a barrel hinge with a printed-in pin or a living-film clamshell, plus a snap latch. Fold shut off the bed.

Sorting tray with twelve scooped compartments and a stacking rim

Storage Parts Tray Sorting trays for screws, beads and bench chaos: every compartment has a scooped front edge so parts roll out under a fingertip, and the trays stack.

Case insert plate with a traced wrench pocket, slots and finger notches

Storage Case Insert Kaizen foam, printed: type a pocket recipe or photograph the tool on white paper: pockets pack themselves, every one with a finger notch.

Fluted windowsill planter trough standing on its dark drip tray

Home Planter Windowsill troughs sized in liters, not guesses: tapered fluted walls, drainage holes and a ribbed drip tray that keeps roots out of the puddle.

Funnel with a hanging eyelet on the rim and a long spout

Workshop Funnel Funnels sized to the actual jar, tank or bottle: inlet, outlet bore, cone angle and spout length, with an optional throat filter and a hook to hang it by.

Assembled spool stand: two A-frames, axle and cone hubs

Workshop Spool Holder Desktop spool stands in five parts: A-frames with drop-in cradles and cone hubs that self-center ANY bore you type in, with optional 608 bearing seats.

French cleat rail with a hanging bracket and tool cup

Workshop French Cleat The whole french cleat system: 45° wall rails plus brackets, cups, shelves and racks whose wedge grips TIGHTER the more you load it. Lift to rearrange.

Batch of round, square and oval miniature bases with beveled edges

Tabletop Miniature Base Wargaming bases in the canon sizes: round, square or oval, beveled edges, a magnet pocket underneath, and the whole unit batched in one file.

Honeycomb storage wall panel with a hook and tool cup clicked into the hex cells

Workshop Honeycomb Wall The Honeycomb Storage Wall, parametric: panels on the community-standard 20 mm hex grid plus hooks, cups, shelves and racks whose hex plugs click into any HSW.

Phone and tablet stands: folded ribbon, curled arch and truss frame, smooth or rippled

Home Phone & Tablet Stand Measure your phone WITH the case, pick an angle and a shape: a light folded ribbon, a curled arch, a truss frame or the classic block, smooth or rippled, and raise any of them for charging. Prints on its side with no support.

Two U-brackets holding a router, and a 10 inch rack panel with keystone ports

Electronics Device Mount & Rack Panel Type a router, power brick or mini PC's size: brackets, rails, a sleeve or a VESA plate for under the desk, the wall or the TV. Or a 10 or 19 inch rack panel with keystones or a device cage.

Window vent insert panel with two hose ports, cut into numbered tiles

Home Window Vent Insert Type the gap your sliding or sash window leaves, pick the hose (portable AC 150 mm, dual hose, 100 mm printer exhaust) and get a panel cut into numbered tiles for your bed, with ports, rim and bug mesh. Prints flat, no supports.

Black 3D printed lens cap with 50mm f/1.8 inlaid in white and a leash eyelet

Electronics Lens Cap Type the filter size printed on your lens (52, 58, 77 mm) and get a push-in cap that snaps into the thread like the original. Lenses without a thread get a slip-over cup. Add a strap holder for up to three caps and put your text or logo on the front in a second color.

Light teal 3D printed drain hair catcher basket with radial slots in the floor, slots in the wall and a centre knob

Home Drain Hair Catcher Measure the drain hole and get a basket that sits in it on a 45° seat, or a slotted cover for a shower drain or a square grate. Slots are 1.5 mm by default, wide enough for water, too narrow for hair. A centre hole takes the stem of a pop-up stopper.

3D printed T-handle for a 5 mm hex key with the size engraved and a groove for the short arm along the crossbar

Workshop Hex Key Handle Pick the size stamped on your L-shaped hex key and get a T-handle, a screwdriver grip or a lever sleeve that fits it. Metric keys from 1.5 to 10 mm and inch keys from 1/16 to 3/8, with arm lengths from ISO 2936 and ASME B18.3. The key snaps, pins or sticks in with a magnet, and the size is on the handle.

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How it works

Three steps, no install

Choose a generator

A box, a Gridfinity bin, a hose adapter, a lithophane. Each page is one tool with sensible defaults already filled in.

Type your dimensions

Millimetres go in, the 3D preview updates as you type. Walls and clearances are checked so what you see will actually print.

Download and slice

One STL per part plus a 3MF with colours and print notes, ready for Bambu Studio, OrcaSlicer or PrusaSlicer.

Principles

Built the way a tool should be

Open formats only

STL per part and a 3MF carrying colours and instructions. No project file that only works here.

No account, no profiling

No sign-up, no tracking cookies. Rate limits count a hash of your address, never the address itself.

Defaults that print

Walls never go below what a 0.4 mm nozzle can make watertight. Override anything, but the defaults come off the printer.

AI only where it helps

Filament matching is an offline algorithm; a language model only adds hints on top, and everything works without it.

Model library

645 ready-made sizes, zero clicks to adjust

Popular hose adapters, Gridfinity plates, vases and organizers. Each opens in its generator with the dimensions already filled in, most with a ZIP one click away.

Browse the library

About

Who makes this

Hi, I'm ramzess. Twenty years of writing software, and somewhere along the way the code started coming out of a nozzle. alpaco.it is where the two habits meet: small parametric tools that turn numbers and pictures into things you can hold.

Every generator here scratches an itch I had first. They run on hardware in a private workshop in Poland, with no ads and no paywall; if one of them saves you an afternoon, that is the whole point.

☕ Buy me a coffee Keeps the generators free and online.

FAQ

Common questions

Are the generators free?

Yes. All of them run in the browser with no account and no payment. The only restriction is a request rate limit so a single looping browser cannot take the machine down; it counts a hash of your IP address, never the address itself.

What files do I get?

Separate STL files for each part plus a 3MF ready for Bambu Studio and OrcaSlicer, with colours assigned and print instructions included. In the box generator the base and the lid are two independent objects on the plate.

Do my files stay on the server?

No. Uploaded artwork and generated models go to a temporary directory that is swept automatically. The dimensions you type are used to build your model and are not stored.

What is the Google sign-in for?

It is entirely optional. If you sign in, alpaco.it receives only your basic profile (name, e-mail, avatar) and uses it for one thing: saving your model configurations so you can reopen them on another device. You can delete a project, all projects or the whole account from your account page.

What does it cost to run, and who pays?

There are no ads, no paywalls and no cross-site tracking. The generators run on hardware in a private workshop in Poland; people who want to help keep them online can do so through Buy me a coffee. Details are in the Privacy Policy and the Terms of Use.