Relay-proof key-fob safe — 3D-printable model preview

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Travel & everyday carry Multi-part assembly

Relay-proof key-fob safe

Block keyless car fobs from relay thieves with a foil-lined box

Keyless car fobs never stop talking, and thieves use a relay to pick up the signal through your front door and unlock the car outside. Line this box and its deep slip-on lid with overlapping foil tape and it becomes a Faraday cage: radio waves cannot get in or out. Drop the fobs in at night and test it by trying the car door with the fob inside. NO SIGNAL is raised on the lid.

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Size: 120 × 80 × 45 mm
Shape: Rectangular
Walls: 2.4 mm
Volume: 91.0 cm³
Est. weight (PLA): 113 g
Parts to print: 2
Category: Travel & everyday carry
Made by: Krypto
Built in: 22 steps

What’s in it

Rectangular, 120 × 80 × 45 mm, with 2.4 mm walls
Raised text: “NO SIGNAL”
Telescoping lid (prints separately)

How to print it

Line every inside face of the box, and the inside and skirt of the lid, with overlapping copper or aluminium foil tape.

Prints as shown on its floor, no supports. The lid prints as a separate part, top down.

Filament: at most about 113 g of PLA printed solid (roughly $2.26 at $20 per kg); normal infill uses less.

To get the files, open it in the generator and choose File › Download STL (one file per part) or Download 3MF (every part on one plate).

Questions

What size is the relay-proof key-fob safe model?

The relay-proof key-fob safe model measures 120 × 80 × 45 mm (width × depth × height). You can change every size in the free SO3D.xyz generator before you download it.

Does it need supports?

No. Line every inside face of the box, and the inside and skirt of the lid, with overlapping copper or aluminium foil tape. Prints as shown on its floor, no supports. The lid prints as a separate part, top down.

How much filament does it use?

At most about 113 g of PLA (91.0 cm³ printed solid), roughly $2.26 of filament at $20 per kg. Normal infill uses less.

How many parts does it print as?

2 parts. The download lays each part flat in its best print position: Download STL gives one file per part, Download 3MF puts them all on one plate.

Can I change it?

Yes. Open it in the SO3D.xyz generator (free, in your browser), change the size, walls, dividers, holes, text or anything else, then download it as STL or 3MF for your slicer.

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Make it fit your space

Change the size, walls, dividers, holes and labels of the relay-proof key-fob safe model in your browser, then download it for your printer. Free, no CAD needed.

Customize this model