pencap
thingiverse
If you misplace your pen's lid, there's no need to fret over it drying out. Just print a new one; however, note that this method may not be compatible with every pen model.
Download Model from thingiverse
With this file you will be able to print pencap with your 3D printer. Click on the button and save the file on your computer to work, edit or customize your design. You can also find more 3D designs for printers on pencap.