Hotend Ultimaker throat make a pathway for filament go from cool zone to hot zone, The inner size for insert filament must be perfect fit for the filament you are using, the inner hole is too big, the filament will jam on the hot zone, the filament will not be able to come out from the nozzle. The Ultimaker throat come with different size, different length, different size thread, all metal or with PTFE tube. Different type of the Ultimaker throats has different usage. The Ultimaker throat, hot block and nozzle must be secure tight to make sure the melted filament will not be able to come out from the gap between the Ultimaker throat and nozzle.
This Threaded Ultimaker throat is for 1.75mm filament. And it made from good quality Brass. 45° degree on the insert area, make sure filament loaded properly and smoothly. This Ultimaker throat will fit on M5 heat sink and heat block.
For Ultimaker 3D Printer
Radiating end thread: M5
Heating end thread: M5