I saw this online (See photo of actual product) and thought it was a good idea so I mixed up my own. The main cap can be attached to a backpack or something and the knurled handle part holds the blade. Just pull it out and it snaps back in when youre done!

What you'll need:

8 - 6mmx3mm magnets like these: https://www.amazon.com/TRYMAG-Refrigerator-Multi-Use-Cylinder-Whiteboard/dp/B09MRN2X7L/ref=sr_1_4?crid=1UJPOKL343YSG&keywords=6mm+magnet&qid=1689869142&sprefix=6mm+magnet%2Caps%2C108&sr=8-4

Regular xacto blades like this: https://www.amazon.com/Exacto-Cutting-Storage-Scrapbooking-Stencil/dp/B07X9741FW/ref=sr_1_8?crid=JOUB69X0VY84&keywords=xacto+blade&qid=1689869937&sprefix=xacto+blad%2Caps%2C157&sr=8-8

an M2-5 cap screw and nut

Notes: Make sure your magnet polarity is correct and match! Its actually easy to put in the magents... drop some glue in one hole, and put in the magnet. Now use that as the handle and do the other piece. Put a drop of glue in each of the 4 holes on the mating piece...drop a loose magnet on the first magnet you put in to guarantee polarity, and then push it in to the other piece. Repeat that 4 times, then do the same for the remaining 3.

If you have any questions, drop me a note.