Installation Guideline

Ruby nozzles' brass body cannot withstand large torque, over-tightening it will likely break the nozzle. It is recommended to install the Ruby nozzle with gentleness, apply just enough torque during installation to avoid destroying the part.

Torque Recommendation

Base on our testing, the brass/copper thread of ruby nozzle will start to break at about 2Nm (17.7 Lbf.inch). To play safe, we recommend install the nozzle with torque at about 0.5Nm (4.4 Lbf.inch). It is highly recommended to use a torque controlled device to install the ruby nozzle. If you do not have one, you may make one using following printable torque wrench designs:

https://www.thingiverse.com/thing:4332963

https://www.youmagine.com/designs/nozzle-torque-wrench

Alternatively, user may disassemble the hotend, remove heater block from the heat break before installation. First install the ruby nozzle to the heater block and then install heater block back to the heat break. Install the nozzle with this method will avoid breaking the nozzle and requires no special tools, however it takes more steps.

Generally Maintainance

When need to swap the nozzle, it is important to heat up the hotend to 180C or above before installation or de-installation of ruby nozzle. Heating up the nozzle will soften plastic in the heater block to allow easier turning of nozzles which prevent applying to much force to the nozzle body.

Ruby is very hard but also brittle. Hitting the nozzle tip with hard surface may shatter the ruby tip. After installation of nozzle, users always need to re-calibrate Nozzle Offset/Z-level/Nozzle Height value to avoid crashing the nozzle tip onto the build platform. As nozzle crashes is the major cause of death of ruby nozzles.

If there is blockage in the ruby nozzle tip. We recommend first try a "cold pull".
Cold pull means heating up the nozzle while the filament is still loaded in the hotend. Preheat the hotend to melting temp and then let it cool downs. When its temperture is below melting temp but the material is about to solidify, pull out the filament from the hotend by hand quickly. This pull out the blocking material altogether with the filament.

If cold pull is not working. Then user may consider following methods:

1. Submerge the nozzle in an organic solvent to dissolve the blocking material.

2. Use a 0.4mm needle to push through a block when the nozzle is heated up. Be careful not to break the tip with too much force.