This is a mold for a concrete clock. The insert is placed in the mold to create the space for the movement. I had to press it down with a piece of lumber to prevent it from floating on the concrete.
This is the movement I used: https://smile.amazon.de/gp/product/B016MKVW3A/ref=ppx_yo_dt_b_search_asin_title?ie=UTF8&psc=1
Printer Brand:
Creality
Printer:
CR-10
Rafts:
No
Supports:
No
Category: Decor
The author marked this model as their own original creation. Imported from Thingiverse.