About this 3D model

you will need 2x M4 x16 bolt to fasten the handle, if you don't have any, you could always print them. all items are printed flat. and with 4 walls if you want to give it unbreakable strength. you need support for the handle. if using cura, i suggest using support interface, and set support Z distance to around 0,18. update 1. i added a second handle that is in 2 parts , that can be printed without support, and can either be screwed or glued together, or both.