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.