fab-dat/fab-mech-dat/fab-injection-molding-dat/fab-injection-molding-dat.md
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+
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+# injection-molding-dat
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+
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+- [[plastic-dat]]
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+
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+- 塑料柱
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+- 加强筋
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+- 加强柱 == boss
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+- 一体成型
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fab-dat/fab-mech-dat/fab-injection-molding-dat/fab-small-batch-molding-dat.md
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+# Small-batch Molding Options
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+
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+A concise guide to three common small-batch molding approaches. Use the table below for a quick comparison, then read the recommended workflows and pros/cons for each option.
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+
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+| Option | Method | Ideal quantity | Mold cost (¥) | Unit cost (¥) | Summary |
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+| ------ | ----------------------------------------- | -------------------------: | --------------------------: | -----------------------: | ----------------------------------------------------- |
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+| 1 | Silicone mold + resin casting | 10–300 | 300–800 | 5–20 | Golden option — recommended for most small runs |
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+| 2 | Aluminum mould / Simple injection mould | Very simple parts only | 1,500–3,000 | 1–3 | Cost-effective per unit if design is extremely simple |
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+| 3 | 3D‑printed mould + injection / heat-press | Prototyping / experimental | Varies (material & printer) | Very low (material only) | Low-cost experiments, not for stable production |
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+
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+## Option 1 — Silicone Mold + Resin Casting (Strongly recommended)
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+
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+Best for 10–300 pieces. Balanced cost, surface finish and ease of use.
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+
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+Costs (typical)
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+
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+- Silicone mold: ¥300–800
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+- Resin part (per piece): ¥5–20
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+
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+Example: 100 pieces (assume mold ¥600, resin ¥10 each)
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+
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+- Average unit cost = (600 + 100×10) / 100 = ¥16 per piece
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+
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+Advantages
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+
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+- Low mold cost
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+- Failed casts are repairable
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+- Good surface finish
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+- Master can be 3D printed (save tooling time)
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+
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+Limitations
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+
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+- Parts are not as strong as injection molded items
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+- Slightly worse dimensional stability compared to injection molding
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+
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+Tips
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+
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+- Use a high-quality silicone (shore hardness chosen by demoulding requirements).
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+- Post-cure resin parts if required for strength/stability.
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+- Consider vacuum degassing when pouring resin to reduce bubbles.
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+
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+## Option 2 — Aluminum Mold / Simple Injection Mold (Grey area)
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+
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+Suitable only for very simple geometries: single cavity, no undercuts, no fine ribs.
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+
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+Costs (typical)
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+
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+- Mold: ¥1,500–3,000
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+- Unit: ¥1–3 (material + simple press running)
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+
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+When it makes sense
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+
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+- If the part geometry is extremely simple and you need many pieces (or need higher strength/dimensional stability).
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+- Note: hidden costs include setup, machining tolerances, and possible rework of the mold.
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+
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+Limitations
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+
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+- Not suitable for complex parts (no undercuts, no deep ribs, no thin cores)
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+- Higher upfront cost and lead time than silicone molds
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+
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+## Option 3 — 3D-Printed Mold + Injection / Heat-press (Advanced / Experimental)
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+
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+Workflow
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+
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+- Print the mold in a high‑temperature resin (or otherwise suitable material).
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+- Use low-melting-point plastics (or hot melt adhesives) to form parts.
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+
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+Suitable for
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+
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+- Rapid experiments, proof-of-concept, or extremely low-cost runs.
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+
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+Limitations
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+- Mold lifetime and dimensional stability are limited by print resin and layer strength.
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+- Not recommended for stable, repeatable production runs.
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+
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+## Recommendation Summary
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+
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+- Use Option 1 (silicone + resin) for most small-batch needs (10–300 pcs): lowest risk, good finish, flexible.
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+- Consider Option 2 only when the part is extremely simple and unit cost must be minimized for larger quantities.
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+- Use Option 3 only for prototyping and experimental workflows where low cost and speed matter more than long-term stability.
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+
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+## Quick checklist before choosing
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+
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+- Quantity required
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+- Geometric complexity (undercuts, thin ribs, threads)
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+- Required mechanical strength
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+- Dimensional tolerance and stability
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+- Surface finish requirements
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+- Budget and lead time
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fab-dat/fab-mech-dat/fab-mech-dat.md
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# fab-mech-dat.md
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-- [[3d-print-dat]] - [[3d-prototype-dat]]
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+- [[3d-print-dat]] - [[3d-prototype-dat]]
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+
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+
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+## fab mech compare
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+- CNC aluminium - 54.86
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+
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+数量 单价 总价
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+1 54.86 54.86
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+2 47.32 94.64
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+5 41.40 207.00
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+10 35.84 358.40
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+20 32.05 641.00
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+
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+- CNC ABS - 41.75
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+
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+
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+数量 单价 总价
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+1 41.75 41.75
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+2 34.43 68.86
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+5 29.73 148.65
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+10 24.33 243.30
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+20 19.72 394.40
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+
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+
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+- 3d print == ￥14.84
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+
fab-dat/injection-molding-dat/injection-molding-dat.md
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-
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-# injection-molding-dat
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-
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-- [[plastic-dat]]
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-
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-- 塑料柱
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-- 加强筋
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-- 加强柱 == boss
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-- 一体成型
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