Ez3D-18x2 Original Version

Ez3D 18x2: Two 18mm Motor Cluster

• Includes black powder "Flash Pan" for ignition (also 3D printed)
• Parts tape together - No glue required!

After conquering the challenge of the "Ez3D-Mini", take a step up to the world of clusters!

Parts List:

1. Ez3D-18x2-60 Fin Can
2. BT-60 Nose Cone
3. Special 3D printed Motor Retainer Cap
4. Two 1010 Rail Buttons
5. One small sheet metal or wood screw
6. Eighteen (18) inches of BT-60 type body tube
7. Five (5) feet of Kevlar string for Recovery Harness
   • Flight tested on 9KM DWLIFE Black Braided Kevlar Cord (1.3mm, 300 lb) but others may work
8. 18" parachute
9. Tape

Assembly:

1. Install Rail Buttons onto Body Tube
2. Tie Recovery Harness to hole in Fin Can
3. Thread Recovery Harness thru Body Tube
4. Slide Body Tube onto top of Fin Can
5. Tape Fin Can to Body Tube
6. Tie loose end of Recovery Harness to Nose Cone
7. Tie parachute to Recovery Harness near top of Nose Cone

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 available with the file download

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 motors into Fin Can
5. Secure Motor Retention Cap onto base of Fin Can with small screw
6. Launch using lots of ignitors or black powder flash pan for reliable simultaneous motor ignition and additional excitement

Recommended motors and expected performance:

• C6-5 (x2) = ~500 ft

Need a boost?

• Clustered booster may require tape to attach firmly
• B6-0 (x2) / B6-6 (x2) = ~400 ft // B6-4 would have been better choice

IMPORTANT POST FLIGHT NOTES:

• 3D printed material shrinks after cooling down from heat of motor
  • It shrinks even more after suffering the heat of several motors at one time. A PLA fin can will likely last one flight. ABS may last several flights.

Flight Test Info:
01-25-2025 C6-5 (x2 - 18 Ns), 199g, 475 ft (Alt2), Motors could not be removed
01-26-2026 C6-5 (x2 - 18 Ns), 202g, 522 ft (Alt2), Wider motor tube - motors were removable with effort. Flash pan ignition.
08-09-2025 C6-5 (x2 - 18 Ns), 147 ft (Msl Meter), PLA, Single motor ignition - trying a 3D printed ematch holder. Didn't work that great. Will stick to tape for now.
08-09-2025 C6-5 (x2 - 18 Ns), Altimeter fell off, ABS, Very early ejection for some reason. 1" Zipper. Motors easily removable.
10-04-2025 C6-5 (x2 - 18 Ns), 214 g, 525 ft (Alt2), New retainer system test. Motors tight at top but removable.
10-24-2025 C6-0 (x2) to B6-4 (x2), 290g, 384 ft (Alt1), Both C's lit but only 1 B in upper stage.
11-09-2025 B6-0 (x2) to B6-6 (x2), 265g, 325 ft (Alt1), Tipped a little after staging. All motors lit.

***** Design refined into the DOUBLE DOUBLE version ********

Comments: e-mail [email protected]