I use OnShape for CAD and KiCad for EDA.
These designs were tested by printing them in PETG on a Prusa MK3S+.

Parametric Mamiya C Lens Cap

 Set #LensFilterID to the filter diameter of your lens. Edit the `LensCap` sketch and right click the text to edit as needed. You may need to correct extrusion surfaces after updating the text.

Parametric Toyo 110mm Lens Board

 Set #HoleDiameter to a preset shutter size like #Copal0, or a custom value. Edit the `board` sketch and right click the text to edit as needed. You may need to correct extrusion surfaces after updating the text.