This is a filter holder for COKIN type ‘A’ filters. Type A have been replaced with larger styles, but I got these, and didn't have a holder to fit the filters. In addition to the 5 printer parts, you need 2 small rubber bands to grip the circular filters and 5x 2.5mm head head bolts (12 mm). Fusion files attached to make modifications, and for other lens filter openings to attach to other than 58mm threads.
The author marked this model as their own original creation.