i might investigate the diy slushie maker, would be very fun for parties when people are playing my machines.
I never pursued it and purchased the plans but I did email a couple of different buyers who had in order to understand the components from which it is made and whether it actually works as advertised.
It's relatively simple concept that uses parts readily available from your neighborhood Home Depot or Lowes.
The most expensive part is a garbage disposal which serves as the ice crush and pumping mechanism.