Time to determine reasonable material characteristics for the end cap. 20-30% recycled plastic seems to be the norm for companies who make efforts to implement recycled materials so a 30:70 ratio of recycledPC:ABS seems like a decent conclusion based on these criteria.

Using data from fusion 360, solidworks, the first research pdf, this stratasys pdf, and another research article, I was able to roughly estimate material properties for this end cap.

These are the values I used under simulation: Young's Modulus: 2.6 GPa, Poisson's Ratio: 0.40, Shear Modulus: 1000MPa, Density: 1.1/cm^3, Yield Strength: 44.58 MPa, Tensile Strength: 46MPa

Young's modulus, Poisson's ratio and the density were largely the same between different sources for PC:ABS. The yield strength was used from table 1 in the first research pdf to match the 30:70 blend. The tensile strength was estimated to be 46MPa as the tensile strength of similar material concentrations was slightly higher than Yield.

Remember, these numbers are not absolute. There are many different variations of PC-ABS and there do not seem to be any standardized set of blends to follow. There are also batch-to-batch variations in the properties of recycled polymers because of variability in the source and the composition of recycled material streams.

Besides this, modifiers can be added to the PC:ABS blend to add desired mechanical qualities to the resulting material or help in binding. This allows for yet even more PC-ABS material variations.