This is a simple base plate for a popular Decade Box you can buy from China.
The size of the Decade Box is 36mm x 90mm. You will need 4 tiny screws to
mount it. A little dab of glue will also work.
Support is not required.
This object main web page is:
http://www.ctheroux.com/decade-box-base-plate/.
You can request the source files on the page listed above.
The author marked this model as their own original creation. Imported from Thingiverse.