How to make body-safe silicone adult toys at home
This guide was drafted with AI assistance.
You 3D print the shape, make a mold from it, and cast platinum-cure silicone into that mold. The print never touches skin: it is only the master (or the mold itself). The finished piece is 100% platinum silicone, fully cured, with nothing mixed in that was not made for it. That is what makes it body-safe, and it is the same process whether you are making a stress toy, a prosthetic finger, a fidget or a custom adult toy.
Makers cast their own soft silicone pieces for plenty of reasons: a shape nobody sells, a size or firmness that fits them, a colour they chose, or a design of their own they want to produce in small numbers. A lot of the demand, frankly, is for adult toys, and that is a perfectly good reason to learn this properly, because it is exactly the use where cutting a corner matters most. This guide stays practical and non-explicit: it covers the craft and the safety, not the designs. For the design rules and the exact mold steps for a specific toy, see how to make a silicone adult toy from a 3D print.
The three safety rules, before anything else
Platinum-cure silicone only
Look for "platinum" or "addition cure" on the datasheet, and a maker that states it is skin-safe once cured. Tin-cure (condensation-cure) silicone leaves catalyst residue, shrinks and degrades with age, and is not meant for skin contact. If the label does not say which it is, do not use it. The full comparison is in platinum vs tin-cure silicone.
The print is a tool, never the product
PLA, PETG and resin prints are porous between the layers and cannot be cleaned properly, and most photopolymer resins are skin irritants. A printed part is the master you mold from, or the mold you pour into. It is never the thing that gets used.
Fully cured, and nothing foreign in it
Only pigments made for platinum silicone, at the dose the datasheet allows. No acrylic paint, food colouring, glitter or craft additives. A cast that is still tacky anywhere did not cure, and an uncured patch is not body-safe: find out why and pour again rather than using it.
How the process works
There are four stages, and the first mold is where nearly all the effort goes. After that, each extra cast is an hour of work and a few hours of waiting.
| Stage | What you do | Time |
|---|---|---|
| 1. Master | 3D print the shape, then sand and seal it so the surface is smooth | 1 to 3 days (print, sand, coat) |
| 2. Mold | Build a mold around the master: silicone in a printed housing, or a rigid printed two-part mold | An evening, plus cure time |
| 3. Cast | Mix, colour and degas platinum silicone, pour it, let it cure | 30 minutes, then 3 to 7 hours of cure |
| 4. Finish | Demold, trim the seam, wash, optional heat post-cure | 30 minutes |
1. The master
The master is the exact shape you want, made in something rigid. For most people that is a 3D print, either a design you made yourself (Blender and Nomad Sculpt are the usual free and cheap choices) or a file you downloaded. Every detail of the master's surface is copied into the mold and then into every cast, layer lines included. So the finish of the master is the finish of the product.
- Print it at a fine layer height (0.12 mm or less on FDM), oriented so the most visible surfaces are not stair-stepped. A resin printer gives a smoother start, but see the warning below.
- Sand from about 220 grit up to 600 or higher.
- Seal it with a brush-on epoxy coating made for prints (XTC-3D is the common one). Two thin coats fill the remaining layer lines and give a glossy surface. Let it cure fully, a full day, before any silicone goes near it.
- Add a flat base or a short plug at the end that will become the pour opening. It gets trimmed off or becomes the flat bottom, and it gives the mold a way in.
2. The mold
You have two real options, and they trade surface quality against effort.
| Silicone mold of the master | Rigid printed two-part mold | |
|---|---|---|
| How | Print the master, pour mold silicone around it in a printed housing | Print the mold halves directly, cast silicone straight into them |
| Surface of the cast | As smooth as your sanded, sealed master | Shows the print's layer lines unless you sand and coat the inside |
| Extra material | Mold silicone, often 0.5 to 1.5 kg | Just filament |
| Release needed | Yes, silicone bonds to silicone | Yes, to stop it locking into layer lines |
| Best for | A design you will cast more than a few times | A quick first test of a shape and size |
Most makers who stick with it end up on the first option: a silicone mold held in a rigid printed shell, either a one-piece "glove" that peels off the master or a two-part block. The mold silicone should be platinum too, because tin-cure residue in the mold can inhibit the platinum silicone you cast into it. And because silicone sticks to silicone, you need a proper release on the mold before every pour. Making the mold covers both routes step by step.
3. The cast
Soft casting silicones are all two-part, usually 1A:1B. The steps that decide the result:
Stir each part, then weigh
Stir part A and part B in their own containers first, then weigh both on a scale with 1 g resolution. Scrape the sides and bottom while mixing, and mix for a full three minutes.
Colour it
Add a silicone pigment made for platinum systems (typically no more than about 3% of the total weight). Mix it into part A first so the colour is even before the catalyst goes in.
Degas it
A vacuum chamber pulls out the air you mixed in. The silicone will rise to three or four times its volume, then collapse, so use a container four times bigger than the batch. Without a chamber, choose a slow-cure grade (Ecoflex 00-30, Dragon Skin 10 Slow) that gives the bubbles time to rise, and pour from high up in a thin stream.
Pour into the lowest point, in one stream
Pour into the opening in a single thin, continuous stream so the silicone fills from the bottom and pushes the air out ahead of it. Do not stop and start; every restart folds air in. Tap and tilt the mold to free bubbles in tips and details.
Cure at normal room temperature, about 23 °C. A cold room can double the cure time. Hardness is the choice that matters most for the feel of the result, and it is covered in the materials guide.
4. Demold and finish
- Demold only when fully cured. Press the thinnest part with a gloved finger. If it dents and recovers, wait longer anyway: the datasheet's demold time is a minimum.
- Trim the seam, if your mold has one (a one-piece glove mold does not), with small curved scissors, flush with the surface. A seam placed on a side edge, not across a face, is much easier to hide.
- Wash it in warm water with mild unscented soap to remove the release agent.
- Optional heat post-cure: some datasheets give a post-cure (for example a couple of hours at 80 °C) that brings the silicone to its full properties sooner. Do it after demolding, never inside a printed PLA mold, which softens at around 55 °C.
- If the surface feels tacky but cured, a light dusting of cornstarch takes it off. If it is tacky and soft, it did not cure: do not use it.
What you need, and what it costs
| Item | Why | Rough cost |
|---|---|---|
| Soft platinum casting silicone (1 kg kit) | The product itself | 35 to 60 |
| Platinum mold silicone (1 kg kit) | Only for a silicone mold | 35 to 50 |
| Silicone-on-silicone release (e.g. Ease Release 200) | Stops the cast bonding to the mold | 20 to 25 |
| Epoxy print coating (e.g. XTC-3D) | Smooth, sealed master | 25 to 35 |
| Silicone pigments | Colour | 15 to 30 |
| Scale (1 g), mixing cups, sticks, nitrile gloves | Accurate ratio. Not latex gloves: latex inhibits the cure | 20 to 30 |
| Vacuum chamber and pump | Bubble-free casts | 120 to 180 |
Prices are typical in euros or dollars in 2026. The vacuum chamber is the one optional big-ticket item; the other purchases each cover several projects.
Where Meshcast fits
Meshcast does the part that used to take the most skill: turning a 3D model into a mold you can print. It is free and runs in your browser.
- Silicone mold maker, contoured mode builds a printed shell that hugs your master with a thin, even silicone gap, split into 2 to 4 parts with printed clips. You get a thin silicone "glove" mold that peels off the master, then sits back in the same shell while you cast. It uses far less mold silicone than a box, which matters at 40 per kilo. How contoured molds work.
- Box mode gives you the classic printed housing to pour a silicone block around the master, with an estimate of how much silicone it takes.
- The seam goes where you want it. Contoured mode's Turn for a cleaner seam and Best split buttons find the orientation where the parting line runs along an edge instead of across a face, and box mode paints undercuts red on the model as you rotate it.
- Air-pocket pins mark the spots where air would be trapped during a pour, so you know where a vent or a tilt is needed before you print anything.
- The silicone calculator gives you the silicone volume, weight and cost of a block mold from your object's size, before you buy anything.
Your model is sent to the generation server only to build the mold and is deleted after. More in the questions below.
Common questions
Can you make body-safe silicone toys at home?
Yes, if the finished piece is cast entirely from a platinum-cure silicone sold as skin-safe, it is fully cured, and nothing that is not silicone ends up in it. The 3D print is only the master or the mold and never touches skin. The work is in the mold and in getting a bubble-free cast, not in any special equipment beyond a scale and ideally a vacuum chamber.
Is a 3D-printed toy body-safe?
No. PLA, PETG and resin prints are porous at the layer lines, cannot be properly cleaned, and most resins are not skin-safe. Use the print as the master you make a mold from, or as the mold you cast silicone into, and make the finished piece from platinum silicone.
How much does it cost to make your own silicone toy?
Expect roughly 150 to 300 euros or dollars in materials and tools for a first project: casting silicone, mold silicone or filament for a printed mold, release agent, pigments, a scale, cups and gloves, and a vacuum chamber if you buy one. Most of that is reusable, so each cast after the first costs only the silicone that goes into it.
Which silicone is used for DIY toys?
Soft platinum-cure silicones in the Shore 00-30 to Shore 20A range. Ecoflex 00-30 and 00-50 are very soft, Dragon Skin 10 is firmer and tougher. All of them mix 1:1 and are sold as skin-safe once fully cured. Never use tin-cure silicone for anything that touches skin.
Does Meshcast keep the models I upload?
No. The silicone and two-part mold generators send the model to the generation server only long enough to build the mold, then delete it. A small preview screenshot of each generation is kept for 30 days, visible only to the Meshcast team, and uploads are never shared, published or used for training. The full detail is in the privacy policy.
Made by meshcast.app. Stuck on a mold? Email us, discreetly, and we will help.