Ez-245

• 3D printed parts for a rocket that flies on 24mm C and D motors
• Parts tape together - No glue required!

Tall thin structures (like rockets) can be a challenge to print. Ez3D Rocketry designs use 3D printing for the short, complex parts such as fin cans and nose cones while incorporating commercial cardboard body tubes as airframes.

Awesome staging sequence photos by Victor Newman Photography

###Parts List:

1. Ez3D-2455-4 Fin Can
2. BT55 Nose Cone
3. 24mm Retainer Cap
   • Print out the multiple sizes (No scaling, +3%, +5%), These account for different printing tolerances and post flight shrinking.
4. BT55 3D printed Launch Lug assembly
5. Eighteen (18) inches of BT-55 type body tube
   • A standard 18 inch tube makes one kit
6. Four (4) feet of Kevlar string for Recovery Harness
   • Flight tested on 9KM DWLIFE Black Braided Kevlar Cord (1.3mm, 300 lb) but others may work
7. Twelve (12) inch parachute (Streamer can also be used but it descends fast)
8. Tape

Assembly:

1. Tie Recovery Harness to hole in Fin Can
2. Thread Recovery Harness thru Body Tube
3. Slide Body Tube onto top of Fin Can
4. Tape Body Tube to Fin Can - avoid blocking integrated launch lug
5. Tape Launch Lug Assembly midway up Body Tube - check alignment with Fin Can launch lug
6. Tie loose end of Recovery Harness to Nose Cone
7. Attach parachute to Recovery Harness

NOTE: Individual printers and filament have different tolerances
- Fit check items before assembly. Options to adjust if necessary:

• Add tape to increase diameter
• Remove material by sanding
• If your printer has a scaling feature, use it to adjust the part size
• Change the dimensions in the FreeCAD file

Launch Preparation:

1. Insert 1 or 2 squares of recovery wadding into Body Tube
2. Load Recovery Harness and Parachute into Body Tube
3. Place Nose Cone on top of Body Tube - ensure slightly snug fit
4. Load motor into Fin Can
5. Screw Motor Retention Cap onto base of Fin Can
   • Depending on your printer, the larger sizes may fit better
   • After a flight or two, the smaller size may fit better
6. Launch using standard model rocket procedures

Recommended motors and expected performance:

C11-3 = ~300 ft (Optimum delay = 3 s)

D12-5 = ~700 ft (Optimum delay = 5 s)

D12-0 / D12-7 = ~1300 ft

Need an extra Boost?

The Ez3D 24 Booster file enables the addition of a booster stage that uses C11-0 or D12-0 motors. The fit is purposefully loose to allow for printing variations but be sure to add tape for a good friction fit.

• 3D printed material shrinks after cooling down from heat of motor
• Removal of motor may be difficult or impossible after one or several flights
• The smaller motor retainer cap may fit better after the first flight
• If existing motor retainer caps no longer work, friction or tape may suffice for retention
• PLA filament most susceptible to shrinking. Others may last longer.

Flight Test Info:

• All motors easily removed due to oversized motor mount design style

2024-11-24 C11-3, 149g, 286 ft (JLogic Alt 2), PLA 2024-11-24 D12-5, 160g, 651 ft (JLogic Alt 2), PLA 2024-12-14 D12-5, 170g, 704 ft (JLogic Alt 2), PLA 2024-11-24 C11-3, 162g, 313 ft (JLogic Alt 2), PLA 2025-01-11 C11-0 to C11-5, Staging was a success but upper stage CATOed 2025-01-11 D12-0 to D12-5, Staging success 2025-02-23 D12-0 to D12-7, 75g + 170g = 250g, 1313ft (JLogic Alt 2) 2025-03-23 D12-7, 180g, 672 ft (JLogic Alt 2) 2025-04-04 D12-0 to D12-7, 260g, Sustainer ejection change blew out back end of fin can. 3D print break. Ballistic recovery