This cube is the 2x2 of square ones. It looks and seems easy, but ZAM! You can't solve it.
Assembly is self- explanatory. Print 3 regular edges, 2 edge As, one of each core, 4 middle pices, and a pin (if you think you're a pro cuber, then print 8 edge As instead of 3 regular edges, and 2 edge As). Like my other cubes, insert the pin into the tapered core and put on all the pices. Glue and insert the end of the pin into the other core. Let dry. Enjoy!