1.75mm conversion kit

Pretty cool. Would be nice if they sold them separately.

https://mosaicmanufacturing.zendesk.com/hc/en-us/articles/115009604967-Using-1-75mm-filament-on-LulzBot-printers-TAZ-5-TAZ-6-Mini-

https://www.thingiverse.com/thing:2412297

Ive used this thing for well over a year with the normal extruder arm.

https://www.thingiverse.com/thing:1673712

The only slight difficulty is removing it when switching back to 3mm filament, but if you pull the filament out the top instead of cutting and running it down through the hot end the adapter comes out with it.