The first manufacturing samples have come back for the “Better” rotary encoder breakout board. This version has two levels of debouncing. The first is the traditional resistor-capacitor network, this is fed into individual schmitt trigger inverters. The output waveforms are nice enough to use on an Arduino without interrupts.
You can buy the Original Mountable Rotary Encoder Board on Tindie. The “Better” version is going out to some beta-testers before I put it up for sale.