X-Acto Safety Cap
This is a safety cap holder for the X-Acto blade. There are two sizes, medium and precision. Medium has a diameter of 11.4 mm, precision is smaller with diameter of D 8.11 mm.
note: this diameters is for the knife not the cap so you can measure it to find out which size you have.
If you Printed it please give me your feedback on it!