Dual Hot End Calibration (v2)
This is the solution for leveling the two nozzles of the JR2x dual hot end (v2). This v2 design includes an adjustment screw for the height of the first (left) nozzle, relative to the second (right) nozzle. The picture below shows the adjustment screw in the top of the hot end. If you do not have the adjustment screw, please review: VIDEO – HD2x/JR2x Dual Hot End Calibration (v1) It is very important to have the nozzle at the same height. If not, this will cause the lower nozzle to hit the part while printing with the higher nozzle.
- Upgrading to a JR2x dual hot end- Start at #1
- Purchased the HD2x that comes standard with the JR2x dual hot end- Start at #6
- JR2x Dual Hot End (HD2x printer comes standard with a JR2x Dual Hot End)
- 3mm allen wrench (use on the M4 bolt)
1) Start here if installing the head for the first time, proceed to step #6 if the JR2x is already installed.
Turn the printer off and slide the linear bearings so that they are in the right position for the hot end. Make sure that the X bearing is slightly too far left (out of the way)
- X bearing- moves left and right
- Y bearing- moves forward and backward
2) Rotate the Y bearing so that the c-clip is pointing down.
3) Line the C-Clip up with the slot in the Y bearing holder (pic3). Then snap the hot end on the Y bearing from front to back. Make sure to clamp with your hands, pull up and press down so that the cross rods don’t get bent (pic4). Then verify that the bearing is seated correctly (pic5).
4) Rotate the hot end from left to right so that the X bearing can be slid underneath the hot end (pic6). There is a step on the left side of the hot end in the X bearing holder slot. Make sure to have the bearing fully inside of the bearing housing. Slide the bearing until the left edge of the bearing is directly underneath the adjustment screw. Then clamp the hot end down on the bearing. Make sure to clamp with your hands, pull up and press down so that the cross rods don’t get bent (pic7).