Lithophane stand

This is a lithophane stand, designed as part of an wedding gift for a family member.
It uses the lithophane generator 3dp.rocks with the outer curve setting, but any (curved) lithophane with the following dimensions will work:
3-4mm thick
142mm wide
31mm high(when laying flat on table)
the design is made so that those values can be changed easily.

[Feb 12 2019] UPDATE:
Added a version without the rings.