Just purchased unmounted 36mm L-Pro filter from Cyclops... It seems to be the better option than UVIR-CUT filter because it is also LP filter.
According to Cyclops, it is the same glass used for Clip-On variety..
So I decided I will 3D print the holder.
But... before starting my own design, I had a look at Thingiverse.. and found
this design.
It is for 1.25" filters, so I will have to modify the STL file, as the central hole needs to accommodate 36mm x 2mm glass (this can be done by loading stl file into 123D (freeware from AutoDesk) and subtract the appropriate cut out.
This "fiddling" will save me $67... not insignificant amount.
For more general applications in the future (for other cameras and telescopes),
this (or similar) design will be useful as the principle.
I am still looking for low-cost solution for UVIR_CUT filter on Alibaba... so far the lowest price is US$50 for 50x50mm sample.
EDIT
Because the design from Thingiverse is for 1.25" filter, 36mm glass will not fit into frame... So I will have to design my own, with lower profile springs.
I will post the design here when tested.