Sinar filter holder for Cokin P filters

A holder for the Cokin P filter system to put them on a Sinar view cam. 
Just add a M3 hex nut and screw to fix it at the desired position. 
 

For the knob I used this model:
https://www.printables.com/de/model/726566-wide-crown-knob-for-m3-screw