Standard X-UAV Talon motor mount is quite weak. This mount allows to use bolts with nuts in place of screws. After printing if nuts doesn't fit, you can use soldering iron to melt it in. Also I have attached a standard mount addition which you could cut from balsa (or also 3D print) and glue with standard mount to use nuts. Source: https://cad.onshape.com/documents/b88364f0eeb76ab38a04b12a/w/24620e08df63944179f12300/e/c967fb1a73beedeed70f2683