The protection I used (polystyrene) from the original packaging, started to dismantle! I bought a NinjaFlex filament only for this purpose: create a better replacement!
Note: my tripod is a Manfrotto 055CXPRO4 (replaced by the MT055CXPRO4), you may have to update the parameters to fit yours:

//--- Stopper sizeh = 40;r = 29.8;flat = 14;//--- podRadiuspodRadius = 29.5;

Voilà,
Enjoy :)

PS. I use this standard library: MCAD/3d_triangle.scad.