Lack Table Leg Extension - Join Hollow end to Solid end

With the Ikea Lack tables, this allows you to join a cut leg (hollow end) with an uncut leg (solid end).

The idea came from seeing these things:
Leg coupler for two solid ends, by noktok: https://www.thingiverse.com/thing:2150751
Leg coupler for two hollow ends, by cfscrwed: https://www.thingiverse.com/thing:2425826

Parts shown in the photos were printed using this black PLA:
https://www.amazon.com/gp/product/B072NY25Q5/ref=as_li_ss_tl?ie=UTF8&psc=1&linkCode=sl1&tag=tofu0f-20&linkId=459