The hotend barbs are compatible with 3mm & 1/8" tubing. I recommend thick wall buna nitrile tubing.
I also procured some very nice quick connect fittings. You can have a set included for $30 (two plugs
and two sockets). They make watercooling maintenance much less painful.
Previously, the filament path in the hot-side of v9 was a tungsten carbide tube, which caused some
problems.
Pressures within a hotend can be as high as 80 MPA (11.6 Kpsi), causing plastic leakage through minute gaps.
Typically, sealing surfaces deform elastically during the tightening of the heatbreak and nozzle,
but as you increase the hardness of a material, the force required to deform the surface increases.
In the case of tungsten carbide, the deformation force required becomes prohibitively high,
risking material fracture before achieving a proper seal. To get around this previously, the mating surfaces were lapped until they sealed on their own.
This was way too much work.
The new design introduces an innovative solution that allows for the local elastic deformation
of sealing surfaces while still being significantly harder than the fibrous fillers and in fact
is as hard as tungsten carbide.
It will remain a secret for now, but know that it is not CVD nonsense but a surface with real
thickness.
The bulk material being steel facilitates the solution, while additionally enhancing high-temperature strength and eliminating hot tightening requirements for copper, brass and steel nozzles.
With a thermal conductivity of approximately 50 W/mK, Model Predictive Control (MPC) is recommended.
To prevent material discoloration, limit heater output to 80W during initial heat-up.
Purchasing
v9hotend@gmail.com
