Flying Bear Reborn 2 Stealthburner Carriage

This model is a redesigned Voron Stealthburner X Carriage mount for the Flying Bear Reborn 2. The major goal of this redesign was to be able to use the wide Stealthburner ecosystem on the Reborn 2. Further goals were to preserve as much print volume as possible and to avoid changes on the original Reborn 2 mechanics.

Thanks to the Voron team for the excellent Stealthburner printhead.

Further thanks to the german community of https://forum.drucktipps3d.de/forum/ which helped me quite a lot during my changes on the Reborn 2.

Model details

The model consists of 6 parts:

1. R2_Carriage_L: The left part of the carriage
2. R2_Carriage_R: The right part of the carriage
3. R2_Belt_Holder: The part which will be mounted to the carriage and where the belts are positioned
4. R2_Belt_Clamp: The part which will put pressure to the belts to fix them
5. R2_Endstop_X: The redesigned X endstop indicator
6. (opt) R2_Microprobe_Mount: An optional adapter for the Biqu Microprobe (similar to BLtouch but much smaller and so it fits perfectly into the Reborn 2)

You will find both STL and STEP files. So you can simply print the parts or rework them easily yourself.

Restrictions

1. The Reborn 2 might loose 1-2 mm on Y. But this can be easily compensated with some washers on the Y optical endstop mount. Alternatively, you can also use an 330x330 PEI print plate and place it 1-2 mm in Y+ direction (as I do it).
2. To enable the full X travel distance the linear rail stop bracket on the right side need to be rotated by 180 degree (horizontal flip).

Required hardware

• Threaded inserts (Heat set inserts)
  • 18x: M3 x 4.6 mm (d) x 5.7 mm (l) OR M3 x 5.0 mm (d) x 4 mm (l) (Voron compatible)
  • (opt) 4x: M2.5 x 3.5 mm (d) x 6 mm (l)
  • (opt) 2x: M2 x 3.2 mm (d) x 4 mm (l)
  • Where to buy?: I have simply bought a threaded inserts set from Amazon
• Countersunk screws
  • 4x M3 x 10 mm: To mount the carriage parts to the linear rail slide carriage (MGN12C)
  • 4x M3 x 10 mm: To mount the belt clamp to the belt holder
  • 2x M3 x 20mm: To mount the belt holder to the carriage (through the belt clamp)
• Cylinderhead screws 
  • 2x M3 x 40 mm: To mount the left and right carriage parts together
  • (opt) M2.5 x 8 mm: To mount the Biqu Microprobe adapter
• Lenshead screws / Cylinderhead screws (type doesn't matter)
  • 2x M3 x 8 mm + washer: To mount the optical endstop sensor below the carriage left part
• Timing belts (optional)
  • 2x 2.5m 10mm GT2 belt (only needed if the original belts are few millimeters too short for the mounting procedure)

Required tools

• Soldering station for installing the threaded inserts
• Some drills to clean the holes in case of too much material flow
• Allen key set / screw driver
• Sanding paper or file to clean the printed parts
• Belt Tension Meter to tighten both belts identically (https://www.printables.com/de/model/115460-belt-tension-gauge-source-file-included)

Print instructions

I have printed all parts with ASA (tested with Extrudr DuraPro ASA and Fillamentum ASA extrafill), 30% infill (for stability reason) and build plate supports. I have used a heated chamber (45 °C ambient temperature) and a low print speed of maximum 50 mm/s to avoid warping.

Hint: When printing with ASA reducing the z offset can be quite helpful to avoid warping. But be careful to not ram the nozzle into the print bed.

Mounting instructions

The following example parts were printed for mounting instructions only (PLA, 150 mm/s, not calibrated at all, not nice looking).

Step-1: Clean printed parts and ensure correct hole sizes (M3: 3 mm drill).

Step-2: Install the threaded inserts.

Step-3: Mount the left and right carriage parts together by using the M3 x 40 mm screws.

Step-4: Install the belts between the belt mount and clamp plate and screw it together with the M3 x 10 mm screws.

Step-5: (Later) Screw the pre-mounted belt holder to the installed carriage.

Important: This step is shown here for easier understandability, but it shall be executed after Step-8 directly on the printer. Otherwise the installation is impossible.

Step-6: Install the Biqu Microprobe mount with M2.5 x 8 mm screws.

Step-7: Install the optical X endstop with M3 x 8 mm screws and a washer.

Step-8: Install the carriage to the linear rail carriage with the M3 x 10 mm counter sunk screws and replace the X endstop indicator.

Don't forget the instructions of Step-5.

Step-9: Install the Stealthburner on the carriage.

Step-10: Screw down your print bed as much as possible to avoid crashes due to changed nozzle height. 

A new bed leveling is mandatory after the Stealthburner installation.

Step-11: Ensure manually that all endstops are triggered in the right way, so that the Stealthburner is not crashing angainst anything.

Important: If you are using a PEI sheet it could be possible that the noozle is too near to the print bed (risk of crashing!). To solve this issue please add a M4 or M5 washer between the Z-endstop indicator and the print bed mount on each side.

Step-12:  Have fun and enjoy your newly installed Stealthburner on the Reborn 2.

Microprobe

Klipper configuration settings for the Microprobe mount based on the documentation available on Github: https://github.com/bigtreetech/MicroProbe

[probe]
...
x_offset: -32.0 # Actual installed offset of Microprobe
y_offset: 11.0 # Actual installed offset of Microprobe
...

[safe_z_home]
...
home_xy_position: 165, 165 # Change coordinates to the center of your print bed
...

[bed_mesh]
...
mesh_min: 15, 15 # need to handle head distance with Microprobe
mesh_max: 290, 300 # max probe range
...

[z_tilt]
...
z_positions:
  0,162
  325,162
points:
  40,150
  320,150
...

Feedback

Feedback is very welcome.