3D Printed Blockmit Jig for Bitcoin Steel Seed Phrase Plate Bitcoin mining product detail photo

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3D Printed Blockmit Jig for Bitcoin Steel Seed Phrase Plate

$12.99 CAD

Lock down your BIP39 seed phrase with flawless accuracy. The 3D-printed Blockmit jig acts as a strict guide for your metal punches, allowing you to easily stamp your recovery words onto standard credit-card-sized stainless steel plates. Crafted from rigid PLA to ensure a perfectly clean strike, this DIY tool is a must-have for true cold storage and uncompromising financial sovereignty.

Availability: In stock
Returns: 30 days from delivery to report a defect or dead-on-arrival unit. No change-of-mind returns.
Warranty: As stated on this listing at purchase: manufacturer's warranty on new hardware, D-Central's own warranty on refurbished.
Support: Ships from Canada with D-Central mining hardware and repair support

Condition: New
Warranty: Support and warranty coverage apply where listed for this product.
Returns: Return requests follow the posted policy and require approval before shipping back.
Stock: In stock.
Lead time: Prepared and quality-checked before it ships.
Ships from: Montreal, Quebec; delivery calculated at checkout.
Payment: Bitcoin, Cards

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Categories: Self-Custody, Cold Wallet Accessories, DIY Bitcoin, SeedSigner

Before you generate a seed

Self-custody is a process, not a purchase. Read what the device actually does, check how your wallet derives and restores, then plan the metal backup and who inherits it.

Questions about this product?

Talk to a mining expert → or call 1-855-753-9997

Description
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Description

Take absolute control of your Bitcoin security with the Blockmit stamping jig, the ultimate DIY tool for your cold storage. While hardware wallets protect your keys digitally, true financial sovereignty requires a physical backup capable of withstanding fire, water, and time. Striking your BIP39 recovery phrase (seed phrase) on stainless steel is the gold standard, but freehand stamping often results in misalignments, overlapping letters, and unreadable plates. The Blockmit eliminates human error by providing a perfect striking guide for your metal punches.

Engineering for Self-Custody

Designed for DIY bitcoiners, this jig features three sliding parts that firmly lock your credit-card-sized steel plate and isolate each line of words. Whether you are securing a wallet generated by your own SeedSigner or any other open-source hardware, the Blockmit ensures that every letter is engraved with clockwork precision, preventing the punch from slipping upon hammer impact.

Key Features

✓ Surgical Precision: The three-axis sliding mechanism adjusts line by line, providing a strict framework for the perfect alignment of your BIP39 words.
✓ Structural Rigidity (PLA): Carefully 3D printed in PLA, the jig offers the necessary rigidity to keep the punch strictly perpendicular and absorb the shockwave without deforming.
✓ Optimized Tolerance: The guide hole is calibrated for easy insertion and quick extraction of the punches, streamlining the engraving process.
✓ Standardized Format: The main base is precisely dimensioned to accommodate standard backup plates (credit card size).

What You Will Need

304 stainless steel plate (85x53mm, 1mm to 2.5mm thickness).
3mm or 4mm hardened steel alphanumeric punch set.
Heavy hammer (mallet or mechanic’s hammer).

Technical Specifications

Material: Polylactic Acid (PLA)
Compatibility: 3mm and 4mm punches
Plate dimensions: 85 mm x 53 mm
Mechanism: 3 interlocking 3D-printed sliding parts

⚠️ Safety Warning: Metal stamping requires the use of blunt tools. Be sure to work on an extremely hard and stable surface (like a solid wood workbench or an anvil) to prevent bounce, and protect your hands when striking.