I was looking for a case design and could not find one. Additionally I wanted to make sure it was padded so that the R2 would not be shaking about the case.

You will need 3x6mm foam tape to ensure that it fits perfectly. According to how I designed. However if you wish to use differently dimensioned tape, you may choose to remix it from this onshape link https://cad.onshape.com/documents/0b8ddb41b28ad6226a1a4df1/w/465bc8f6fc77ec6b2a1c99f4/e/78a725a765ca03c7ba59c79a