Stereo E-Stim boxes

I currently have the 2b Estim box but it has started acting up lately. i was wondering if anyone can recommend any estim boxes and if someone here makes DIY Estim boxes?

what are they

2b has lifetime warranty, contact estim systems.

look up joanne’s estim discord, there are a few users there that make and sell stereostim units. i have built a few myself, they are not hard with a basic understanding of electronics. google “tronic’s midistim” if you’re inclined.