shanethielen@Moonus88 I don't have Onslaught so I can't say for sure. I looked at a review on YouTube and it looks to me like the arm that connects the grey middle portion to the body might get in the way. Thanks for asking though.
shanethielen@TXR4521 the one in the picture is held in by friction, but I printed it on my own printer (M3D Micro). There three protrusions on the bottom that slot into the gaps in the body of Hot Spot, but I don't know if the tolerances are right for Shapeways.