About This File
This x-carriage is designed as a nozzle probing option for mounting a Mini Stealth in a Voron Trident or V2.4. It uses a simple linear compliant mechanism to allow minimal Z travel while being quite rigid in the other five degrees of movement. Completely assembled including Z and X endstops it weighs in at 18g. It should require the same Print_Start preparations as the Voron TAP to ensure a clean nozzle and accurate probing.
On my Vorpal 180 printer I got sub 0.002mm probe_accuracy results while testing but this design does require a rigid gantry and print bed. While probing with a scale on top of the bed, it was reading up to 800g of force but this is not a very reliable measurement. The Vorpal printer has a PCB style bed and no 2020 profile for the gantry. I am working to rebuild the toolhead on my Trident to test the DAB but that uses a Prusa PCB bed as well.
There are breakable supports and bed adhesion aids (shown in green in the last picture) built into the .stl file. After printing, the flexure feature will need to be pried slightly to separate the center section from the bridge that the toolhead mounts to and allow movement. This is easier to do while the part is still warm from printing and a thin spudger can be useful.
I have added two sample flexures to demonstrate how the length of the web pieces effect the stiffness of the mechanism.
2 - M3 x 4 grub screws (not pointed)
4 - M2 x 10 self tapping screws (5 if X endstop)
1 - microswitch with lever removed
2 - M3 square nuts
4 - M3 x 12 BHCS
- After ensuring that the flexure moves freely, install one of the grub screws in the top and screw it in just enough to remove the looseness in the flexure. This provides a known lower limit of travel.
- Install the Z_Stop_Boss with two M2 x 10 screws from the front.
- Then install the Z micro-switch with the red trigger on the left (viewed from the back). The wires can be fed to the front through the lower gap in the flexure.
- Install the other M3 grub screw on the bottom of the DAB_Z_Boss. Screw it in until you hear the micro-switch trigger and then turn it back out until the trigger releases. This makes the trigger travel distance less than 0.5mm.
- Mount the x-carriage to the MGN12C carriage with four M3x12 BHCS. There is room to pull the four belt ends through and trim them at the front face of the DAB.
For now, this design will only fit the Mini Sherpa and the LGX Lite versions of the Mini Stealth. The other extruders have stepper motors that sit too low and collide with the top of the flexure frame.
Please leave comments, questions and feedback.