I used the Fusion 360 Gridfinity block template to construct a 1x1 gridfinity holder for Plastic Razor Blades. I couldn't find plastic razor blade holders that were vertical instead of horizontal taking up a 1x3. So this was created.

It holds one plastic razor blade and 5 spare razor blades on either side of it.

Please note that I'm very new to Fusion 360. I hope I did this well but feel free to leave any constructive feedback as I'm still striving to learn.