CrOD - Creality Orbiting Dragon

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### CrOD - Creality Orbiting Dragon I created this toolhead in my quest to squeeze the final bit of print performance and quality out of my very heavily modified CR-10S Pro. It is not meant to be a universal design - it was designed to my specific requirements and will only accept the Orbiter v2 extruder and the Phaetus Dragon hot end. It does not use the CR-10S Pro X carriage trolley, but instead it uses the Mellow version of the "standard" Creality X trolley that fits the CR-10 and the Ender. [](https://youtu.be/EwCfXB5Bf0A) #### Disclaimer I designed this for myself and it has been working extremely well for me over several hundred print hours. I am happy to share this design with others who may find it useful, but it comes with no warranties of any kind and by using it you agree to do so at your own risk. #### Key Design Requirements - Based on the "standard" Creality X carriage trolley - Structurally sound but easy to service - Rear facing stepper motor to minimize overhang moment & maximize acceleration - Minimal loss of Z print height envelope - No loss of X/Y print area or X movement range - Dragon installation using the 4 Phaetus supplied M2.5 screws - BL Touch installation with adjustable Z offset (via a shim) and minimal X/Y offsets - Effective Dragon cooling with minimal air spillage over the printed part - Highly effective, high flow part cooling - Good wire strain relief and management - Easy access to X carriage roller adjustments #### Important Considerations - Total cost was **not** my primary design consideration. The components were selected based on their performance and suitability rather than their price. - Some print volume height is lost due to the Orbiter v2 orientation. This is not an issue on my CR-10S Pro because the stock design cannot print beyond 350 mm height without crushing the Bowden tube and the harness against the upper frame. Height loss can be minimized by using a very short teflon tube at Orbiter entry and feeding it with filament from above the printer. This avoids running a reverse Bowden tube between the gantry and the upper printer frame extrusion. - Both cooling fans require 12V supply. This requires a dedicated power supply, a buck converter or a controller board capable of selectable fan voltage. I am using a Duet 3 Mini that allows me to select 12V supply for the two toolhead fans. - The Mellow version of Creality X carriage that I used is slightly different from stock: (1) the hot end attachment standoffs are shorter by 1.5 mm and therefore the respective Mount_Body recesses need to be adjusted to achieve flush fit on a stock (OEM) carriage. For convenience I included a modified Mount_Body_OEM STL file, but note that I am not able to verify the exact fit with the OEM carriage because I only have the Mellow carriage; (2) the carriage roller spacers are shorter than OEM and their design requires additional spacer shims - this does not affect the function but may slightly affect the Y-axis travel extents depending on the specific printer installation. #### Parts - Mellow [CR10 Extruder Back Support Plate](https://www.aliexpress.com/item/4001360812007.html) (if needed) - [Orbiter v2](https://orbiterprojects.com/orbiter-v2-0/) extruder - Capricorn teflon tube (approximately 42 mm long, trim for snug fit) - Reverse Bowden 2 mm ID teflon tube (optional, based on individual installation needs) - [Phaetus Dragon ST](https://www.phaetus.com/dragon-hotend-st/) (only standard flow has been tested) - Heater cartridge & thermistor or RTD - [BL Touch v3.1](https://www.antclabs.com/bltouch-v3) - [Sunon MF30101V1](https://www.digikey.ca/en/products/detail/sunon-fans/MF30101V1-1000U-G99/9950100) hot end cooling fan (substitutes discouraged) - [Delta BFB04512VHD](https://www.digikey.ca/en/products/detail/delta-electronics/BFB04512VHD/9351795) part cooling fan (no substitutes) - M3x5x4 [Brass Hot Melt Insert Nuts](https://www.aliexpress.com/item/4000232858343.html) (qty. 11) - M3x8 BHCS (qty. 11) - M3x12 BHCS (qty. 1) - M3x25 BHCS (qty. 2) - M3x14 Self Tapping Screw for Plastics (qty. 3) #### Assembly Refer to the following animation for assembly sequence: [Creality Orbiting Dragon (CrOD) v123 Assembly](https://youtu.be/0G1X4F1FeqI) #### Additional Information My CR-10S Pro is equipped with Duet 3 Mini 5+ running latest Klipper and driving 0.9 degree Moons' steppers. Acceleration measurements shown in the attached image indicate that the X-carriage is capable of achieving well in excess of 10,000 mm/s2 accelerations. It naturally works very well at the much more restrictive 3000 mm/s2 imposed by the substantially heavier Y-axis. For sake of comparison, the stock CR-10S Pro X carriage assembly with Micro Swiss all metal hot end weighs approximately 290 g, while this direct drive assembly weighs approximately 410 g. The stock CR-10S Pro print bed assembly, not including the support trolley and wheels, weighs approximately 1700 g. I created and tested numerous iterations of the parts cooling duct design, ultimately settling on the included configuration. The geometry of the Dragon results in very low clearance between the heater block sock and the print bed when the nozzle is just above the print bed. Combined with the desired proximity of the BL Touch to the print nozzle, this results in very challenging geometry to fit the cooling nozzles. This configuration fits well within the available space while providing high air flow over the printed part. The attached photographs visualize the air flow by showing local depression in the surface of water. The BL Touch design offset is 0.0 mm in the Y axis and -30.0 mm (to the left of the nozzle) in the X axis. Optional bling is included in the form of separately printable **CrOD** text insert that can be printed in accent colour and affixed into the part cooling duct recesses using cyanoacrylate glue. #### Acknowledgments Many thanks to the authors of prior work that I used to complete my design: - [Orbiter 2 CAD model](https://orbiterprojects.com/download/orbiter2/Orbiter%20v2.0%20mockup.step) from Robert Lorincz & LDO - [Dragon ST CAD model](https://www.phaetus.com/wp-content/uploads/2021/01/Dragon-ST-Models.zip) from Phaetus - [BL Touch CAD model](https://grabcad.com/library/bltouch-v3-1-2) by Felix Ort - X-Carriage CAD model from [Creality Ender-3 GitHub Repository](https://github.com/Creality3DPrinting/Ender-3) - Brass Hot Melt Insert Nut CAD model from [Voron-2 GitHub Repository](https://github.com/VoronDesign/Voron-2/blob/Voron2.4/CAD/VORON2.4_Assembly.f3d) - Fastener models from [McMaster-Carr](https://www.mcmaster.com/)

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CrOD - Creality Orbiting Dragon

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