I purchased a Number and Letter punch set from Amazon and the plastic box broke so I designed a replacement and printed it - here is the result! 

In case you're curious, here is the punch set I originally purchased on Amazon: https://www.amazon.com/gp/product/B000I2FW2Q/ref=ppx_yo_dt_b_search_asin_title?ie=UTF8&th=1

While it is purpose built to hold the ¼" 36 piece set, the box can be used for anything. In addition, you can simply resize it in your slicer to meet other needs. Enjoy!

This is a simple print and should turn out fine using your printer's default settings. You may need to do a touch of clean up around the lid seat on the box.

Lid is 66 x 66x 32

Box is 66 x 66 x 52 (including lid seat)