X-acto Knife Case (146 mm length)

I designed this wanting a good case that would match my set of caliper's case. It should be the correct size for a new X-acto knife with replacement blade bought from Walmart. As said in the title, it is 146 mm in length and 7 mm to suffice for a close to 7 mm diameter of the blade handle. It has a box cover but not on the ends so that it is easy to remove and so that it fit in my bed.

You may have noticed that I changed my printer to a mp voxel. I finally sold my mp select mini and am so happy. Just to brag on monoprice, I highly recommend the Voxel. It is a great printer.

I am still working on the design, so tell me if something is wrong, please.