OTF Utility Knife

thingiverse

I've completely restructured the OTF Knife posted here, using the same mechanism but with a few key changes to make it fully functional. This knife can insert a standard utility blade or a Stanley blade, perfect for UK users. To get started, I've included an STL file for a plastic blade that will fit perfectly: http://www.thingiverse.com/thing:3221468 designed by Ponddust. You can also use real utility blades if you prefer. After printing, you may need to do some minor sanding to get everything running smoothly. Focus on the longest straight edges of each piece - the blade housing and mechanism sections will require the most attention. The case is split into two sections, making it easy to glue together or drill/screw for extra security. If you're looking for a stronger build, simply increase the infill percentage. However, keep in mind that this will also affect the overall weight of the knife. A powerful rubber band is essential for this build. Don't be afraid to experiment until you find one that works perfectly - I'm currently using a doubled-up band and it's working great. The stronger the better, if you ask me! You may want to consider gluing the spring in place, as it can be a bit loose at first. This will allow for some give and take in the mechanism. If you do choose to glue it, you may need to sand it slightly shorter and adjust until everything works correctly. Note that this build is not suitable for countries with strict laws regarding utility blades. If that's the case, please print at your own risk and consider using the plastic blade included instead. With high enough settings, the plastic blade can be sharp enough to cut through tape and other materials. This project was my first major build, and I'm sure there are better ways to do things - but I hope you enjoy it for what it is!