I ordered one the cheapest yet most powerful laser modules which should fit with some minor adjustments to the E3D-Toolchanger toolplate. 

Check the website for more information about the laser module: https://neje.shop/

I've disassembled the laser module and created a CAD-model which can be found here:

https://grabcad.com/library/neje-n30820-laser-module-20w-1

For the module to fit you'll have to adjust the ToolChanger Receiver by removing the ''front part'' like illustrated above:

The link to the E3D-Part: https://e3d-online.com/products/toolchanger-receiver

For the slot feature to work you'll have to adjust the aluminium-profile body of the laser module as well. The implemented laser module will look like that:

• Milling of the ToolChanger receiver (illustration above)

• Milling of the aluminium housing of the laser module 

• Milling of the housing for clearance of the coupling mechanism