I hope you used a hard wood with a Janka hardness of 1,500+. The harder the wood, the more reactive the dice will be, which means, the more random they will be, coming out of the tower.
Some of the exotic woods are above 2,000+ on the Janka hardness scale, and while I love how reactive they are, Hickory, is plenty reactive, at 1,820 Janka hardness.
If you used Plexi-Glass (scratches/fogs up, over time), or something less hard/reactive, I would recommend building a new one. Hickory (1,820) is relatively inexpensive. If you go for the exotic stuff, like Padauck (1,725), Purpleheart (1,860), or Bloodwood (2,900), the materials cost jumps, drastically.
Anyway, here is a slow-motion video of just how reactive dice, are tumbling through Bloodwood baffles (2,900 -- extremely reactive, as demonstrated): individual polyhedra dice, handful of polyhedra dice.
I love my dice towers (Hickory and Padauck). I play a bucket-o-dice game, and my towers are indispensable when rolling handfuls of dice! My dice will, on occasion, roll out of the trays, but it is uncommon, at worst. I supply several dice towers to my fellow gamers, when I host games: they ensure completely random rolls, and they prevent dice from being lost, or knocking into figures and terrain. Cheers!
