I see a Creality Ender 3 V3 (not SE or KE) for $130 refurbished, and also a Creality CR-10 SE for $103 refurbished on ebay. Are either or these a good choice to get into the hobby, or am I making a mistake? Should I rather buy a Bambu? My budget is around $100-$200 max. Please advise.
Depends on what you are doing. I’ve been 3D printing since 2017. I’ve had maybe 2 prints over that time that wouldn’t fit on the A1 Mini. Both of which were useless throwaway toys that I could have easily done without.
The thing with FDM is that print time and filament usage scales cubically with size. Double the size, 8x the print time and filament usage.
The sweet spot are parts that are a few cm into each direction. Below that the printer often doesn’t have enough detail, above that it takes forever to print.