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
• Sections
• 3D view
• Toolbox: Scale, Flatten, Etch, Shaft, 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.

Sections

The bottom-left drawing: the canal split lengthwise into sections, entry on the left, tip on the right, in mm, drawn over a faint copy of the profile so the sections line up with the shape. Every section has its own cross-section, texture and etch.

• Bands. Each section is a band with a small icon of its own shape and a dot per texture layer. Click a band to select it: the Cross-section editor, and the Shaft and Etch popovers, all then act on it.
• Drag a boundary (the line between two bands) to move it: both neighbouring sections resize, the canal's total length stays fixed, and neither section may go under 10 mm.
• + splits the selected section into two copies of itself (same shape, twist, blend, texture and etch), each half the width. Delete merges the selected section into the previous one, keeping the previous section's own shape and layers; it is disabled with only one section.

Cross-section editor

The panel at the top right of Sections, larger than the small oval it replaced: the selected section's shape, drawn end on with the round outline in grey.

• Drawing. Click on the curve to add a point; drag a point to move it (angle and radius factor are clamped so points stay in strictly increasing order round the shape); Corner or Smooth sets the selected point's type; Delete removes it. One drag is one Undo step, exactly like the Profile drawing.
• Presets loads a starting shape: Round, Oval, Slit, Square, Triangle, Star 5, Star 6, Lobed 4, Lobed 6. Edit the points afterwards as you like.
• Symmetry (None, Mirror, Repeat with a count) repeats the drawn points round the shape. Keep area (on by default) rescales the shape so a star or square keeps the canal's own effective size; off, the radius factors are absolute.
• Twist (degrees per mm) turns the shape steadily along the section, for a spiral star or square. Blend (mm) is how far this section's shape blends into the next one.

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, 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, 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. Shaft and Etch act on the section currently selected in the Sections panel, and their title says which ("Section 2 of 4").

Flatten

Cuts a flat chord into one or more sides of the otherwise round cross-section, over the whole canal (it is not per 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 texture reliefs on the selected section only. A section holds a list of texture layers (up to four), each independent, summed on top of one another — pick a body pattern and a second one for a ridge or crease, both on the same section. Carried into the object files and into the mould, so the finished mould reproduces it.

• Layer list. The select box lists the section's layers; + Add appends a new one (starting from the Pimples default) and selects it, Remove deletes the selected layer. Pick a layer in the list, then edit its pattern and settings below; each layer keeps its own.
• 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 selected section's own length: Start/End as a percent of the section, 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. 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. For a tip pattern, split off a short last section in the Sections panel and give that section its own texture layer.

Entry

Reshapes the first section, so it only affects the canal near the entry face.

• Shape. Round leaves the first section's shape untouched. 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. Lobed pinches the opening into a number of petals. Choosing Round again merges the entry back into the canal's second section; Slit or Lobed splits it off, or resizes it if it is already split.
• Length (5-40 mm) is where the first section ends: how far from the entry face the shape runs before the canal's own section takes over. It is kept at least 10 mm short of the next section boundary.
• Ratio (slit only, 15-100%) is the out-of-plane width over the in-plane width at the face.
• Lobes (lobed only, 3-8) is the number of petals; Depth (0.5-6 mm) is how far each one pushes into the opening.

The panel always opens on Round: the first section's shape may already hold anything drawn by hand in the Cross-section editor, which these three presets cannot read back, so Apply always starts from a clean slate rather than guessing.

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.