Resin casting · B2B OEM/ODM · Flexible silicone tooling
Resin silicone molds.
Built for detail.
Flexible silicone tooling for complex figures, undercuts and fine surface detail — practical from prototype validation to small-batch resin production within a B2B custom program. Silicone is not a high-volume steel mold. It is the right tool when detail, demolding freedom and batch size matter more than millions of cycles.
The mold is reviewed around the master, undercuts, parting and the way the cast part will be removed and finished. A 3D and demolding review comes first.
01 / The silicone advantage
Flexibility buys
design freedom.
A silicone mold is flexible. That flexibility is the advantage: it can release shapes that a rigid mold would lock, and it can reproduce fine surface detail without a steel tool. It is not the cheapest way to make thousands of identical parts — it is the practical way to validate a sculpt, cast a complex figure and produce a small batch without committing to high-volume tooling.
Flexible release
Silicone can flex around undercuts and recessed areas that would need slides in a rigid tool.
Fine surface capture
Surface texture, sculpted detail and small features transfer from the master into the mold.
Lower tooling entry
No steel mold base or complex ejection system; the investment is more accessible for a first batch.
Faster iteration
Revise the master, make a new silicone mold and compare versions before committing to production tooling.
The advantage is not “better than steel.” It is more freedom at a lower tooling entry point — for the right quantity and shape.
02 / Silicone vs steel
Different tools.
Different jobs.
Silicone is not a replacement for steel injection tooling. The right choice depends on shape, quantity, surface requirement and how long the tool must run.
| Decision | Resin silicone mold | Steel injection mold |
|---|---|---|
| Mold material | Flexible silicone rubber | Steel cavity and core |
| Best volume | Prototypes and small-to-medium batches | High volume and repeat production |
| Undercuts | Flexible release helps with complex shapes | Requires slides, lifters or design changes |
| Tooling entry | Lower entry compared with steel tooling | Higher investment, justified by volume |
| Unit cost | Higher manual labor per part | Lower at high volume |
| Mold life | Limited; depends on resin, shape and handling | Long production life with maintenance |
| Best fit | Resin figures, statues, prototypes, collectibles | Rigid PVC / ABS toys and components |
03 / Process
From master
to cast part.
The mold is built around the master and the way the cast part will be removed, finished and assembled. A simple prototype and a multi-part collectible do not use the same mold structure or finishing plan.
3D design review
Check structure, proportion, undercuts, parting and surface detail before tooling.
Output: tooling reviewMaster model
Prepare and inspect the master so it matches the approved 3D design.
Output: approved masterSilicone mold
Build the flexible mold with controlled parting, walls and detail capture.
Output: flexible moldCast & finish
Cast resin, demold, trim, sand, fill, paint and inspect the final part.
Output: finished partResin casting is not a fully automated process. Resin material and finishing requirements are reviewed with the part, not chosen after casting.
04 / Quantity & cost
A prototype.
Or a small batch.
Silicone tooling is practical for samples and limited production. At higher volumes, the process should be compared with injection molding before a recommendation.
A development sample for design verification and approval, not a retail one-off order.
A practical range for collectible figures and projects needing detailed resin production.
Larger orders are reviewed for mold life, casting efficiency, finishing time and injection molding.
Resin casting carries manual work per part: casting, demolding, trimming, sanding, filling, assembly and surface finishing. Product size, structure, detail and skilled labor all affect the unit cost. See the MOQ guide for the wider planning view.
05 / Factory-built
Mold, cast and finish
inside New Miho.
Silicone mold making, resin casting, painting and assembly stay inside New Miho's own factory team, so the tool and the finished part are not separated between unrelated vendors.
Silicone tooling
Mold structure planned around undercuts, parting and demolding.
Casting & finishing
Demold, trim, sand, fill and surface finish under one roof.
Painting & assembly
Color, masking, assembly and packing handled by the same team.
Owned factories
Mi-Ho and Boyuan are our own facilities, not external suppliers.
06 / Questions
Silicone molds,
clearly.
Direct answers about tooling, undercuts, quantity and mold life.
What is a resin silicone mold?
Why use a silicone mold instead of a steel mold?
How many pieces can a silicone mold produce?
What quantity is suitable for resin molding?
Can silicone molds handle undercuts and complex shapes?
Can resin parts be painted and assembled?
Review the shape
Send the 3D file.
We will review the mold.
Tell us the figure size, number of parts, target quantity and surface expectation. We will confirm the demolding route and the next practical step.
B2B projects only · paid tooling review · NDA available · resin / silicone
