Wheel Bearing Grease Packing Tool adapter / No Zert

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I wanted to find a way to repack wheel bearings with grease more quickly than by disassembling the hub. Of course, there are commercially available devices designed to make adding grease between the two bearings of the hub easy, but they were all made from metal and had a grease fitting/zert installed. Some also included a back plate, but I wasn't willing to pay that much for this type of tool. I decided that the pressures could be contained with a 3D printed adaptor tool. A custom-made one wouldn't need a back plate if it was made with tight tolerances. The first version was made with supports, but they seemed to damage the threads on both parts. Fortunately, these materials can be fused together with a little heat applied. I used PLA just because it was loaded at the time. I might have to look into chemical reactions for added assurance in future builds. If I take the time to redesign, I would move the center distribution area closer to the grease fitting to create angled dispersion tubes, resulting in less grease to "prime" the tool and potentially reducing internal pressure.