Mechanical Pencil

thingiverse

A lot of people have been asking for this, despite the fact that printing it can be challenging. Proceed with caution. This is a fully printed mechanical pencil that I designed several years ago. You can find more information here: http://thecornercase.blogspot.com/2014/07/3d-printed-mechanical-pencil.html All STL file units are measured in inches, so scale accordingly to convert them to millimeters (use Google). ***These parts can only be printed on high-resolution printers that use SLS Nylon or Polyjet*** (a print method that doesn't require support structures). The 'Normal' version is often difficult to get right, while the '30 Percent Larger' version usually works better. Both versions require a lot of delicate cleaning to function properly. The 'Normal' version takes 0.9mm lead and 7mm diameter erasers. The '30 Percent Larger' version takes 1.3mm lead and 7mm diameter erasers. After printing, the parts need to be carefully freed for the pencil to work correctly. The screw mechanism needs to be lubricated and broken-in for smooth operation. I've used Crisco, Vaseline, and silicone lube for this. Breaking in the screw takes about 5-15 minutes of running it back and forth until the nut can travel the full length of the screw. I usually do this without lead first, then add a piece of lead and repeat. Sometimes, initially, the lead breaks when trying to tap it back in, but once the screw is broken-in, the lead slides back in easily. Once done, the pencil should run smoothly. Good luck! If you like my stuff and want to show your appreciation with some cash, you can do so through Etsy: https://www.etsy.com/listing/693234420/i-like-your-stuff-bro