Adding a extruder to the Rambo mini

I have given up on making the rumba work. I tried to add a ponds probe. Didn’t work. Tried to add a bltouch. Didn’t work. Now the rumba is not communicating with with my pc. So I have moved on to using a Rambo mini but the one drawback is that it only has one extruder capability. I would like to know if there is any way to add an extruder to the Rambo mini. Whether it be a separate board or soldering or something. I am open to anything.