Elena's Burr
Designed by Aleksandr Leontev, made by Eric Fuller 2016.
(8 pieces, Wenge, Zebra, Quartersawn White Oak, 2+9/16 inches square)
Looks like 12 pieces with four in each direction,
but actually there are four standard burr shape pieces and four T-shaped pieces that join two rods together.
Here is what the puzzle maker said:
"Elena's burr is an interesting variation with a lot of tricky movement.
The level 13.7 solution will keep you very very busy.
Disassembly alone is a feat,
with lots of dead ends.
Reassembly without directions is extremely difficult.
Elena's burr is an elegant design, and the ability to come up with a unique solution
at such high levels with such simple pieces is an achievement.
I really enjoyed making and playing with this one!
Construction of this puzzle is superlative.
Fit is dead-on and the pieces slide with the perfect amount of friction.
I really like how this one turned out....it's possibly the best of the update."