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.