I changed the stem to be easier to print on low resolution printers. It is still tricky to print, try reducing printing speed and scaling up a few percent

LulzBot

Mini 2

No

No

printing can be very tricky, try sizing up by a couple percent if it doesn't fit, and reducing print speed. some print orifices will simply be too big for the precision required here

Absolutely no supports

reduce print speed to 40mm/s
0.15 layer thickness
0.8 wall thickness
205c nozzle temp
bed temp 65c