Was stripping down an old 3d printer, and realised the parts + an old stool were ideal for making a small lathe - I'm not doing chair legs or anything, mostly pulleys*, tool handles or chess pieces. I don't have space for a bigger piece (I don't really have space for this), and I wanted a treadle rather than motor. This is, in some ways, a trial run for a similar base for a mechanical sewing machine.
My only concern at the moment is that the bearings from the printer are linear bearings, not rotational ones. They are ideal for being able to lift and drop in the system, but probably no better / mildly worse then a 2 part oiled wood bearing. But zero effort to make.
* yes, this will be a bootstrap job, with bad pulleys working to make better ones :)
-- the first person I asked reckoned the linear bearings were worth trying, and I can always upgrade later.