Menus explained

Every panel, button and slider on the design page, in the order they sit on screen. For the steps after Render (printing, pouring, curing), see the casting guide instead.

The screenshot in the in-app help (the ? button, top right) numbers the same thirteen areas this page walks through. Use that for a quick refresher, use this page for what each control actually does.

• Header: name, length, templates, save
• Profile
• Surface
• Path
• 3D view
• Toolbox: Scale, Flatten, Etch, Shaft, Tip, Entry, End
• Sleeve
• Checks
• Print it for me
• Render and Download
• Printer
• Quantities
• Gallery, Publish and Share link

Header: name, length, templates, save

• Name. Type a name for the design. Empty, the template name shows as a grey hint.
• Randomizer. Builds a new random design: a random template family, size, bend and a texture on about half of them. Undo brings your design back.
• Length and Fix length. Length is the total length of the shape, base to tip. With Fix length ticked, dragging the path keeps this length; untick it to let a path edit change the length instead.
• Templates. Opens a gallery of the built-in starters, each with a picture, and below them any design you saved in this browser. Click a card to load it; the gallery stays open so you can try several, and only its ✕ closes it. Drag it by its title bar. A saved design has its own small ✕ to delete it. Loading replaces the current design, but Undo brings it back.
• Save. Keeps the current design under its name, in this browser only. It then shows in Templates.
• Export JSON, Import JSON. Export downloads the design as a .json file, a way to back it up or hand it to someone else. Import loads one back in.
• Undo, Redo. Step back and forward through edits: profile changes, Surface, Flatten, Shaft/Tip texture, Etch, Entry, End, Scale, template loads and Randomizer all count as one step each.
• Help (?) and Guide. The ? button opens a numbered screenshot of this same page. Guide opens the casting guide in a new tab.
• Gallery. Opens the public gallery of designs other people published, in a new tab.

Profile

The top-left drawing: thickness (radius) against distance from the base along the centreline. The solid curve is one side; the dotted curve is the other side, mirrored until you break it.

• Point type buttons (Corner, Smooth, Even, Asym) set how a selected point's handles behave: Corner has none, Smooth eases through, Even mirrors both handles, Asym lets them differ (a sharper turn on one side). Pressing the active type again resets the handles.
• Break makes the dotted (mirrored) side of a point independent, so it can have a different radius from its solid twin. Used for an asymmetric profile, like a glans corona that sits differently front and back.
• Delete removes the selected point.
• Ø in the caption under the drawing is the diameter at the selected point: both sides added. Read only; change it by moving the point.
• Drawing. Drag a point or a handle to reshape the curve. Shift-click adds a point at that spot, or removes one you shift-click directly. Shift-drag on the background box-selects several points. Arrow keys move the current selection 2 mm. Zoom buttons (−, +, 0) sit at the bottom right of the drawing.

Surface

The Surface button, next to the Profile heading, opens a small popover that reshapes the whole profile in one pass, instead of dragging points by hand.

• Pattern picks the effect: Smooth (rounds the whole profile, Amplitude is how far a neck may thin), Waves, Ripples, Beads (rounded bumps pinched in at a narrow neck, like anal beads) or Sawtooth (repeating bumps along the length, with Amplitude, Period and Width), or Simplify (removes points within a tolerance and smooths what is left).
• Apply reshapes the profile as one Undo step. There is no live preview here; check the profile and 3D view after applying. The panel stays open, so you can Apply again with different settings. Revert undoes only the treatment just applied, and is enabled only right after an Apply. The ✕ closes the panel, and the title bar (☰) drags it out of the way.

Path

The bottom-left drawing: the line the canal follows, seen from the side. The canal is always straight, so this drawing is not editable: no point tools, no dragging points or handles. It shows the straight line the design already is. A later update replaces this panel with Sections, for shaping the canal along its length.

Section (the small circle)

The small panel at the top right of Path is the cross-section, seen end on. It starts round. Drag the pink handle sideways to stretch the section out of the path plane, up to 2 : 1 wide, or squash it down to 1 : 2 flat. The value shows under it. Double-click the panel for round again. The mould still splits in the path plane, so an oval section never locks in the mould. Randomizer makes about one design in three oval.

3D view

The centre panel: your object standing on its base, inside a wireframe box the size of your printer's build volume (set in Printer, below).

• Drag to turn the view, scroll or the pink +/- buttons to zoom, the pink 0 button puts the camera back.
• Colour swatches above the numbers pick a flat colour or one of fourteen base-to-tip gradients. This is for your eyes only: it is not baked into any exported file and does not change the print.
• The numbers under the view (canal length, canal diameter, sleeve OD, silicone volume, silicone weight) update live as you edit. Silicone weight is the amount to mix, waste included, the same figure as Quantities. The translucent shell round the canal is the sleeve's outer body: it previews the cast, it is not part of the canal design itself.
• mm / in switches those numbers to inches, fluid ounces and ounces. Only the readouts change; the design, the panels and the files stay metric.

Toolbox: Scale, Flatten, Etch, Shaft, Tip, Entry, End

A small floating toolbox sits near the bottom right of the 3D view, in that order: Scale, Flatten and Etch (the shape tools), a divider, then Shaft, Tip, Entry and End. Every tool shows its effect live in the preview; Apply keeps the change as one Undo step, Cancel (or Esc) puts the shape back as it was. A panel stays open until you press Apply, Cancel or Esc — clicking elsewhere never closes or loses it, so you can turn the 3D view to check the result before deciding. Drag a panel by its title bar (the "☰" handle) to move it out of the way of the model.

Flatten

Cuts a flat chord into one or more sides of the otherwise round cross-section. Runs before Shaft, so a relief such as the tentacle-sucker pattern sits on the flat bed instead of the round body.

• Top, Bottom, Left, Right. Tick any combination. Top and Bottom are the two sides in the plane of the path (front and back); Left and Right are the two sides out of it.
• Amount (mm) is how deep the cut goes, shared by every side ticked. It never cuts past a 5 mm radius, so a thin neck is never cut through.
• Start, End, Fade zone the flat along the length the same way Texture does: Start and End as a percent of the length, Fade as a length in mm over which the cut grows in at each edge of that zone.

Shaft

Lays a relief over part of the length. Carried into the object files and into the mould, so the finished mould reproduces it. The same panel is shared by two independent targets: the Shaft button in the toolbox (design.texture) and the Tip button below (design.tipTexture) — same controls throughout, only the target differs. Both pick from all twenty-two patterns.

• Pattern picks from twenty-two: pimples, spikes, bumps, balls, grooves, pyramids, diamonds, hexagons, woven, diagonal ridges, vertical lines, cross, veins, scales, wrinkles, leather, warts, coral, tentacle suckers, hairs, pores, creases.
• Height (0.2-6 mm) is how far the relief rises, or sinks for a groove-style pattern.
• Tile (up to 100 mm) is the size of one repeat.
• Start, End, Fade zone the texture along the length: Start/End as a percent of the length, Fade in mm at each edge of that zone.
• Stretch spreads the pattern wider round the body: fewer repeats, wider lines and veins. Pushed far enough, the pattern shows less than one full repeat round the body and a seam appears; Mask (below) can hide it.
• Twist leans the pattern so its lines run at an angle, or follow the shape's own curve.
• Spin turns the pattern's start point round the body.
• Mask hides a slice of the pattern, leaving 360 minus the Mask value showing, starting at the Spin point; the hidden slice turns and leans with the pattern. Mask fade softens both edges of that slice so the pattern blends out instead of cutting off sharply; it only does anything once Mask is above 0. Spin and Mask together isolate a single vein or line.
• Rotate is a slider that turns the whole pattern in 45° steps, 0 to 315. One control, shared identically by the shaft and the tip. Invert sinks a raised pattern (and raises a sunken one).

Fine detail is hard to print and to pull cleanly out of silicone: anything under 1 mm is flagged in Checks. Deep or sharp patterns (spikes, coral) are the ones to demould slowly.

Tip

A second, independent texture layer (design.tipTexture), summed on top of the shaft's own texture rather than replacing it — pick both a body pattern and a tip pattern and both show. Opens the same texture panel described above, preconfigured to the last 15% of the length near the tip (Start 85%, End 100%) with the Vertical lines pattern, but every field is adjustable exactly like the shaft's. Meant for a glans ridge or a crease: Vertical lines gives one ridge or groove running the length (Spin plus a narrow Mask isolates a single line at any angle round the tip), Cross gives a crossing pair. Counts toward the feature-size warning and the mould envelope the same way the shaft's texture does.

Entry

The section at the entry face (design.entry), absent or Round by default. Blends back to the canal's own section over Length, so it only reshapes the first part of the canal.

• Shape. Round leaves the canal's own section alone. Slit makes the entry an ellipse: the in-plane half width stays the profile radius, the out-of-plane half width narrows to Ratio times that (never under 1.5 mm). Lobed pinches the opening into a number of petals.
• Length (5-40 mm) is how far from the entry face the shape blends back to round.
• Ratio (slit only, 15-100%) is the out-of-plane width over the in-plane width at the face.
• Lobes (slit lobed only, 3-8) is the number of petals; Depth (0.5-6 mm) is how far each one pushes into the opening.

A wide entry wastes the grip: Checks warns when the entry radius runs over 1.2x the canal's own median radius. Templates and Randomizer keep the entry at or under the median; a hand-drawn profile can go wider, the warning just says so.

End

A tip bump (design.tipBump), off by default: a smooth dome of silicone rising from the closed end of the canal toward the entry, on the axis, to meet the tip. On the printed core it is a dimple in the core's own tip. Closed sleeves only.

• Tip bump checkbox turns it on.
• Diameter (4-20 mm) is the bump's width at its base. Height (0-6 mm) is how far it stands out of the canal's end wall.

Scale

Resizes the whole design by a percent, applied to both the profile and the path.

• Width, Height sliders, in percent; plus makes it larger, minus smaller.
• Lock keeps width and height moving together, so the shape's proportions do not change.

Sleeve

The top panel on the right. The design you draw in Profile and Path is the canal, the void running through the sleeve; this panel sets the plain outer body cast round it. It is always on: every design carries a sleeve, defaulting to OD 65, length 135 mm. Values snap to 0.5 mm and are clamped to their range; an out-of-range entry is set to the nearest allowed value and says so.

• OD (30 to 100 mm) is the outer diameter of the body. Length (60 to 260 mm) runs from the entry face to the closed tip, and must leave at least 8 mm past the canal's own tip for the core's tip spigot.
• Flange Ø (the OD up to OD + 30 mm) and flange height (4 to 25 mm) set the rim at the entry that the toy grips or rests against.
• Neck width (0 to 20 mm; 0 removes it) and neck depth (up to OD / 2 minus 10 mm) cut a grip groove right below the flange.
• Tip dome (10 to 50% of the OD) is how deep the closed tip domes in.
• Tip vent. On by default. The printed core carries a thin spigot through the tip, left as a small hole once the cast is pulled: it centres the tip in the mould and lets air in to break the suction when the core comes out. Off leaves the tip solid and the core without a spigot.

Checks

Lists problems that would break the mould, tear the silicone or leave the core too little to stand on, each with what to do about it. Fix everything flagged before you render.

• Sleeve wall. The thinnest silicone between the canal and the outer body. Warns under 8 mm, blocks under 6 mm: shrink the canal there, or grow the sleeve OD.
• Canal too long. Blocks when the canal's tip sits within 8 mm of the sleeve's own tip, leaving the core's tip spigot no room. Shorten the canal, or lengthen the sleeve.

Print it for me

The pink box under Checks. If you have no printer, the mould can be printed in PLA on a professional printer and shipped from Europe: Small $25, Medium $40, Large $60, plus $15 for an optional UV resin coating, plus shipping to your country. The box shows which size this mould is, from the filament estimate in Quantities; above Large it asks for a quote.

• Order by email publishes the design to the gallery, anonymously, so the link opens it in the tool, then opens your mail app with the order written: the link, the size, the tier and a line for your country. It is off while Checks blocks the mould.
• Order privately publishes nothing. It downloads the design file (the same as Export JSON) and opens your mail app with the order, asking you to attach that file. Mail links cannot attach files themselves, so attach it before sending.
• UV resin coating, +$15: the cavity and the core are sealed with UV resin and fully cured, for a smooth, glossy surface with no layer lines, so the cast comes out smooth. The price in the box and the e-mail include it when ticked.
• Silicone and pigment are not included; they are cheap on Amazon. See the silicone guide.

Render and Download

• Render builds the two-piece mould around the sleeve's outer body: a hexagonal block split along the centre line, with a tip socket and two foot sockets cut in for the core, registration pins so the halves only close one way, grooves for rubber bands, pry slots to open it after the cure, and vents where air could be trapped. It then builds the core: the canal shape, a stem, a bar with two feet that seat in the foot sockets, and the tip spigot when Tip vent is on. See mould basics for what each mould part is for.
• Mould STLs, Mould 3MF, Print sheet appear once Render has run. The STLs are three files: mould half A, half B and the core; the 3MF carries all three in one file, with Bambu Studio's ironing option checked for the parting faces and no supports needed for any piece (the core prints lying flat on its bar). The print sheet lists how much silicone and filament the design needs, how the halves close, and how the core seats in the mould.

Printer

Pick a printer from the list, or type X/Y/Z directly. Sizes the wireframe box in the 3D view and checks that both the mould halves and the core, standing on end, fit inside it.

Quantities

Silicone mass to mix (with the waste allowance), split into part A and part B by weight at the mix ratio you set, the size of one mould half, and an estimated filament use for the mould and the core together. Open Assumptions to change the mould wall thickness, silicone waste percent, mix ratio, silicone density or print infill that these figures are based on. See how much for the reasoning behind the defaults.

Gallery, Publish and Share link

• Gallery opens the public gallery of designs other people have published.
• Share link publishes the design the same way and copies a link to it. The link opens the design straight in the tool.
• Publish sends the current design's file (its shape, colour and texture, nothing else) to that gallery under a random two-word name. It cannot be edited or removed afterwards, so check the design first. See the guide's privacy and terms for what is and is not stored.