A cap that gives your's jars a second life! :) You can use them for storing spices, cocoa, powdered sugar and chocolate and so on. Just measure your jar diameter and print customized version that will fit it :) You can customize the number and size of holes too. The cap should exactly match your jar - even 0.2 mm of diameter is important. So you may need to print it several times to find the perfect size. The cap should fit in jar tightly, so you will need a little force to remove it with spoon. You may also find scaling function in your slicer program helpful to slightly change the diameter. If you had any troubles with this thing - do not hesitate to ask me :)