I work for a Lulzbot and Ultimaker reseller on a freelance basis.
Lulzbot is recommended for flexible materials and will do a wonderful job. The price is elevated but what you get is a very reliable machine that can handle more materials than most printers.

That being said, I have seen Prusa MK3's at work last year in professional settings (design studios and medium series fabrication) and have to say the prints are fantastic. It is the best I have seen for a good budget that can even handle Filaflex.

If you are looking at printing FlexPLA (will be perfect for drones) also check out the Wanhao Duplicator 5S mini, it has a large printbed and wider Bowden so with less friction it can print flexible materials quite fast (60mm/s) and increase printing output 4x with a 0.8mm nozzle.

Let us know what you go for!