This is Betelgeuse, my 3D printable Level 1 High Power Rocket with dual deployment.

With the reducer and retainer, it's a 54mm ID body designed to fit the full family of 38mm motors. I haven't tested it against anything too aggressive yet, but it's held up well to H motors that are more on the low max impulse, longer burn side.

The motor reducer and motor retainer are designed to be replaced after each flight if printed in PLA or PETG. If you are able to print these parts in PA, then they should last you much longer. In PETG/ PLA, it will soften slightly and the reducer I've found to be tighter onto the case post-flight.

The sled I would ensure that you orient so that the layer lines are in a different direction that the rocket as it is designed to be part of the retainment for the upper and lower AV enclosures. This ensures that you're able to access your electronics. This sled also has holes specifically for a bluejay altimeter, but you should be able to drill holes into it for others.

For other materials outside of the typical shock cord, chutes, quicklinks, swivels, nomex and e-matches, I would recommend 4 forged eyebolts that are long enough to screw into the appropriate bulkheads, and still have room for a washer and nut on the other side. I would use red loctite on these connections as well. The only connection that you cannot do this on is the nosecone. I recommend using gorilla glue, or some other brand of water activated poly-glue not only for that connection, but on all of the body connections. JB Weld and other epoxies don't adhere that well to plastics, and CA will be too brittle.

You will also need:

• (4) M3x20 screws to retain the AV Couplers
• (2) M4x50 screws to retain the motor retainer
• (2) M4x10x6 Brass knurled inserts
• Blue tape to hold the pieces while the glue sets
• not necessary, but I use these to hold the black powder charges (they fit about 1.5g, which is plenty for this rocket): https://www.amazon.com/dp/B07QJXTVTT?ref=ppx_yo2ov_dt_b_fed_asin_title&th=1

Assembly:

• Screw in the eyebolts for all sections (Upper Booster, AV Bulkhead, Upper AV Coupler, Nosecone)
• Fin Can, Mid Booster and Upper Booster are glued together, taking care to ensure that the rail guides are lined up.
• The Lower Ring is glued into the Booster Coupler.
• Before gluing these 2 pieces together, take a moment to run your drogue shock cord as it will be more difficult later. Then these 2 pieces can be glued up.
• The AV Bay, lower AV Bulkhead and Lower AV Coupler can be glued. *Note, I'm realizing as I write this that I forgot to add the indexing pegs to these sections. Take care to ensure they are aligned when gluing. If you cannot comfortably insert your separation charges in here you can add 2 screw holes and use 2 more M3 screws to hold the lower bulkhead to the lower coupler.
• The lower coupler is designed to friction fit onto the lower ring section by adding blue tape until desired friction is achieved.
• The AV sled is placed into the AV bay, the upper AV Coupler over that, and 4 screws are used to hold that in place.
• As with the drogue section, I would run the main chute lines before gluing up the top parts, as it's easier to access.
• Last, the Upper ring is glued into the bottom of the Main Chute Bay, and then the Nose Cone on top of that.

That should be it. If you have any other questions, please feel free to reach out daveayottejr@gmail.com or @daveayottejr on IG are probably the easiest ways to get ahold of me, as I don't know how active I will be on this site. I will however, ensure that any issues are fixed and updated. Also, feel free to share your prints, flights and remixes with me!

Finally, by printing and flying this rocket, you are assuming the responsibility for your own hardware. That risk is part of the hobby, and while I will happily address any design issues that arise in future iterations I will not take responsibility for your failed flights. It is up to you to have the proper certifications, to run the appropriate pre-flight testing and to fly safely. Happy flying!