"Echo" dolphin jet boat

Model Overview & Print Notes

**Welcome to the "Echo" Dolphin Guide** Many thanks to **RC Andy** for the great construction video, which you can watch here: https://youtu.be/Rwqbqk1J104?si=XiF0SL-FuLJFylr4 **Request_Update_11/09/25:** Everything can be printed with a 220 print bed, except for the TPU Lid Base. Until now, that is. I have just uploaded a version for the 220 print bed. You don't have to reload everything, just download this zip file: Request_Update_11/09/25_TPU_LID_220.zip **UPDATE 11/08/25** Trim Jig Corrected ;) This boat is designed for the Mjet35Jet drive from MJET Development, You can download and print them here: MJet 35: https://www.cgtrader.com/3d-print-models/hobby-diy/other/m-jet-35-3d-printable-jet-pump-for-rc-boats **Complete instructions** - and parts required are available for download or can be downloaded here in advance: https://drive.google.com/file/d/14eGq1Fvt-D0P0boWbMjbfF0Cpn6D9M39/view?usp=sharing **Additional building instructions in video format can be found here:** https://youtu.be/k-OmSH_6vXs -> 01_motor_mount_preparation https://youtu.be/uaEzq5ovCFM -> 02_motorservo_set_installation https://youtu.be/rfPEgY6uJS8 -> 03_trim_stage_assembly https://youtu.be/1gUz101uuJg -> 04_Installing_the_trim_servo_mount https://youtu.be/38rL5mX1ckE -> 05_ESC_installation **Community Support** Join our community to share your build and get support: Facebook Group: https://www.facebook.com/groups/1495734037969634/ Discord Server: https://discord.gg/j2zdESp5 **Note for Experienced Builders** While the instructions are detailed, some steps may be challenging for inexperienced builders. Feel free to seek help in the Facebook group. **Selling Built Boats** Mass production for sale is not allowed without a contract. Selling 1-2 boats per year to make room for new projects is acceptable. **Technical Specifications** Total Length: 540mm Total Width: 320mm with fins , 180 witout Total Height: 190mm Hull Thickness: 3mm Printed Weight: ~1000g ± Loaded Weight: 1500-2000g ± (my 4s setup with 4000mah approx. 1.8kg) **Print Settings** Structural Parts: Minimum 2 walls Minimum 4 top/bottom layers Minimum 20% infill **Hardware Needed ( complete list in the instructions)** ~1kg PLA+ filament and 0.1kg TPU Assortment of M2 screws Assortment of M3 screws M3x5.7-OD4.6 Heat inserts 2k epoxy glue CA glue Note: All screw lengths in the pictures are the maximum lengths. ## 3D Printing Settings

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