PolarPup – Magnetic EDC Razor Knife

🐾 PolarPup Version 2.0 is out!

Check out the new version here: https://www.printables.com/model/1802893-polarpup-v20-magnetic-edc-razor-knife

⚙ Version 2 Enhancements

The PolarPup v2 was literally designed from the ground up (because I lost my original files on an old computer!). After carrying mine daily for almost a year, I kept track of all the things I wished were different and here is that list:

• Much tighter fit for the razor blade so it is held secure

• New tab to easily release the razor blade when changing it

• Raised blade pivot for smoother operation (no more sanding required)

• Retaining ring for the magnet in the handle (no more super glue needed)

• Cham-fillet edges for better printing (no supports needed)

🐾 PolarPup – Magnetic EDC Razor Knife

Meet PolarPup, a compact and clever 3D-printed everyday carry knife that blends playful design with smart magnetic engineering. Inspired by the Vosteed Corgi V (https://www.vosteed.com/products/corgi-v-a3705), the PolarPup uses opposing magnets to lock the blade securely in both the open and closed positions — so it stays safely in your pocket until you’re ready to use it.

Designed around a standard Stanley razor blade, the PolarPup makes blade swaps quick, easy, and completely tool-free. With multiple deployment methods — front flipper, grip flipper, or a smooth swing-open motion once you get the feel — it’s also one of the most fidget-friendly knives you can print, thanks to its springy button action and multiple deployment methods.

🧲 Required Hardware

• 2 × 8 mm × 2 mm magnets

• 2 × M3 × 10 mm nuts and bolts

• 1 × standard Stanley-style razor blade

⚙ Tips for Best Performance

The PolarPup is designed with tight tolerances for a snug, rattle-free fit. If it feels stiff at first, just keep using it for a few days to break it in naturally.

For an ultra-smooth action:

• Lightly sand the inside faces of the handle and blade holder with 400-grit sandpaper

• Add a drop of light oil around the pivot

⚙ Recommended Print Settings

These are tuned for strength, precision, and smooth motion on small mechanical parts like this knife:

Material: PLA+ or PETG (PETG recommended for added toughness)
Layer Height: 0.20 mm
Infill: 30–40% (Cubic)
Perimeters: 3 or more for stronger pivot walls
Supports: None should be necessary (but if your printer struggles with bridges, you can add them under the bolt recesses. Avoid adding them where the blade sits!)
Orientation: Print handles flat on the bed for dimensional accuracy and smooth face finish (files are already oriented this way)
Assembly: Insert magnets with correct polarity (repelling orientation for lock mechanism) before final tightening. The magnet in the handle will require a drop of super glue.
Post-Processing: Light sanding + a small drop of oil on the pivot dramatically improves action

⚠ Disclaimer

The PolarPup is a fancy plastic blade holder, not a full-metal knife. Please use responsibly and only for light-duty tasks such as opening packages, hobby projects, or small cutting jobs.

It’s not intended for heavy-duty work or prying. Treat it with care, and it’ll reward you with an incredibly satisfying magnetic snap and fidgetable action that’s hard to put down.