Lead foil holder slides into Varian Accessory Mount (the one at 65.4cm from source) for use with TG51 output calibrations (6FFF in particular). Positions 1mm (+/- 20%) Pb sheet at 30cm from phantom surface (close enough).
Natively holds McMaster Carr 6x6x3/64" sheet without the need for cutting. (about 15$US) https://www.mcmaster.com/catalog/130/4344/9032K271
Optional insert with 7x7cm cutout can be used for smaller pieces of Pb you have lying around.
Prints as a "box" and 2 "tray wings" which slot together (dab of CA glue is helpful).
Models can be printed without support.
Enjoy!
The author marked this model as their own original creation.