Improved Interlocking Scrabble Tiles (empty-faced)

[Update] Having thoroughly tested this design at the qepHom 2017, I've found that there is a slight modification to make.
I'll lower the height of the outgoing connectors a bit, so that the plugging tile doesn't sit on it, giving the "lower" tile a tiny bit of room to move up.

Also, I've "designed" a simple center stone with 4 connectors (yet being 3 times as large), which very nicely prevents the words from running together too soon.
(May not be a problem with English, but in Klingon most words are only 3 letters, it gets tight fast.)

I'll update this design as soon as I have time.



The third attempt at scrabble tiles that won't just fly across the board if you thump the table in frustration.
This may be their final form :-)

Like the second attempt, this does not connect to all sides equally - there are two clearly defined sides, and you can't connect them wrongly.

The connections should be strong enough to withstand an aggressive tug, though you still can't pick