Timing pulleys, roller-chain sprockets, involute gears, worm drives, bevel gears and planetary sets, each built to the ISO, DIN and ASME standards. Set the numbers, let the app check them, and download a finished part: STL to print, STEP for your CAD, DXF or SVG to cut.
A general CAD package can draw anything, which is why a pulley takes an afternoon. Each of our tools makes one kind of part, with every option that part needs and nothing else.
GT2, HTD, T5, XL and 30+ more belt profiles. Hubs, set screws, spline and hex bores, spokes and flanges, as a single pulley or a two-pulley drive.
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Roller-chain sprockets for ANSI, ISO 606 and bicycle chains — single or multi-strand, with hubs, bores and spokes, as a two-sprocket drive.
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Involute spur, helical and herringbone gears by module or diametral pitch — single gears, pairs, internal rings and racks, checked against DIN 3960.
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A worm and the wheel it drives, by module or diametral pitch: 1 to 8 starts, ZA, ZN, ZI and ZK threads, the wheel cut by the worm itself.
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Straight, spiral and hypoid bevel pairs by module or diametral pitch: miter gears, right-angle drives and straight pairs at any shaft angle from 10° to 170°.
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A whole planetary gearbox in one design: sun, 1 to 8 planets, ring and carrier, with any member held, up to three stacked stages, and the carrier's pins and bearings.
Learn more & open it →Spur, helical and ring gears, worm drives, bevel pairs and planetary sets, all live. Not sure which you need? Start from how your shafts sit.
E-Box Designer — parametric 3D-printed enclosures for electronics: draw the box, place the boards, cut the holes, print it.
Pick the belt, chain or gear tooth system and the tooth count, then the bore, hub, set screws, spokes and flanges. The 3D view updates as you type, in mm or inches.
The Dimensions panel compares your part with the published standard and says which one. One click on Auto-fix applies the settings that clear the warnings.
STEP at true size for your CAD, STL with print compensation for your printer, DXF and SVG with true arcs for the laser or waterjet.
Ready-made drives for the most-searched belts, and 28 chain drives from BMX to industrial, and 25 gear sets from robot gearboxes to racks, and 18 worm drives, and 30 bevel pairs, and 31 planetary sets. Click one to open it in its generator, change what you need, and download — or take the pulley samples' STLs free.
Printed and run on an S5M 690 belt: a 1 : 5 reduction to a 100-tooth wheel on eight spokes, whose top flange prints as a separate ring and glues on over 40 nubs, while the 20-tooth pulley prints its flanges in place.
Printed and run on an HTD 315-3M belt: both 5 mm bores carry a D-flat under one M4 set screw in a captured nut, the 60-tooth pulley runs on six spokes, and both print their flanges in place.
Printed and run on a 150XL belt: two M5 set screws per hub thread straight into hex-shaped holes in the plastic, with no nut or insert, on 8 mm bores; the 45-tooth pulley has five spokes and both print their flanges in place.
Printed and run on a GT2 belt: the 45-tooth pulley is cut down to three spokes on a 1 mm web, both pulleys print their flanges in place on breakaway supports, and two M3 set screws per hub bite into captured nuts.
Tooth profiles, flange heights, keyways and retaining rings come from the published standards and the makers' own data — and the app tells you which.
No subscription and no seat licence. Buy a pack of tokens when you need them; every new account starts with 20 free tokens.
SVG and DXF with true lines and arcs, for laser, waterjet and CAD sketches.
STL with your print compensation applied, ready for the slicer.
STEP at true nominal size, for Fusion, SolidWorks, Onshape, FreeCAD and the rest.
No account needed to design. Open a generator and start typing.
