Well I went and bought one.
I got a Crealty Ender 3 Pro and now have something to build all those things I never knew I needed.
I reckon the ones to get are those that can do PEEK or its ilk but as they are expensive I will start with the cheaper ones and hopefully in a few years when I have this mastered and prices have dropped I will be able to invest in the better printers. Also the development of plastics for printing will have improved.
They are not a tool for instant gratification as printing takes a while, sometimes a couple of days and you still have the prints that for some reason go awry but the machine still keeps printing what it is programmed to do and you end up with a birds nest..
Today I printed 2 discs to mount LEDs in Lucas guard top side lights, a cover for a Shimano gear shifter on a pushbike but it was the wrong one, a tyre valve cap and finally a screw in oil funnel for filling a Honda EU1 generator. The Lucas led discs I designed on Fusion 360 which is a must to learn if you want to print your own items.
You also spend a lot of time printing parts to modify your printer or adjust things that could have been done better.
Adrian