I stopped using attys a long time ago but kept some for trying a juice.
Thats what i would get them for. I'm a carto/tank girl myself. but if i was DIYing i would need to try my creations.

I have a few old CE3's that I cut down the tube, and some standard size bottom coil cartos that I took the filler out, these are the things I use to test juices after mixing. Seems to work pretty well for me and then I can just rinse, and repeat.
If you don't think you can use the stuff anymore and don't have anyone to give it to there is always PIF.![]()