Why buy a pencil case when you can 3d print your own?
Here you have a cool hexhagonal one, the inner dimensions are:
-diameter 35 mm
-height 175 mm
The thread works fine, there's no need to scale anything. You can find the sample video here:
If you print one I would love to see the "made" here
The print takes approximately 10 hours @60mm/s
Easy design with Fusion 360