3d Printed HOJO-Nike-Nike-Hydac build thread!

[ljwilley]

So, yesterday I was scrolling through thingiverse to see what rockets I should 3d print when I found THIS

Yeah, that's right. It's a Hydac stacked on not one but TWO Nike boosters and THEN put on top of a HOJO booster. The files were designed by @Leo on TRF and are here on thingiverse: https://www.thingiverse.com/thing:6672074
The Honest John booster is bt70, the Nike boosters are bt60, and the Hydac sustainer is bt50. It is designed to fly on 29mm motors.
I have already printed the Hydac fincan and the Hydac nose cone.:

 

[Bravo52]

That looks like some serious fun! 4 stages? Should be a pretty straightforward build. As always appreciated....PICTURES!

 

[ljwilley]

That looks like some serious fun! 4 stages? Should be a pretty straightforward build. As always appreciated....PICTURES!

Thanks! I won't be building it as a 4 stage rocket, Just single stage. But it will still look like it is 4 stage!

 

[Raptor 2]

So the chute will be housed in the top end of the third stage?

 

[Leo]

Super cool that you are tackling this project. Looking forward to seeing how you come along.

Please post your printer settings for each part you printed so everyone has a general idea as a starting base.

Info: Don't forget to remove the support ring on the Hydac fincan, as per instructions.

 

[ljwilley]

So the chute will be housed in the top end of the third stage?

Yep!

Super cool that you are tackling this project. Looking forward to seeing how you come along.

Please post your printer settings for each part you printed so everyone has a general idea as a starting base.

Info: Don't forget to remove the support ring on the Hydac fincan, as per instructions.

I have printed the nose cone hollow with 4 layer walls, and the fincan was printed on normal settings. No rafts, supports. Also thank you so much for putting this on thingiverse; this is literally the coolest thing I have every tried to 3d print!

 

[ljwilley]

I've printed the Honest john fincan, both Nike fin cans, and the HOJO-Nike adapter. Both of the Adapter pieces I printed with 15% infill and no rafts/supports. The Nike fin cans were printed with 100% infill and no upper or lower layers. The Honest john fincan was printed with 15% infill and supports for the fins and the bottom of the motor mount. I am printing the HOJO booster rings and the Nike-Nike adapter right now.

 

[Leo]

I have to admit, this is exciting!

 

[BABAR]

Cool!

How are sections “coupled”?

Might be nice to have a plastic twist slot or screw together system to make it easier to break down the rocket into two or more segments for transport.

 

[ljwilley]

Oops! Just realized I printed the Nike Fin Cans wrong-made the walls too thick. Re-printing them now! Also, the bands for the HOJO booster and the Nike-Nike adapter are done. I couldn't print the adapter hollow for air to pass through due to the overhang below the coupler, so I just drilled a big hole in it. Should work perfectly!

Cool!

How are sections “coupled”?

Might be nice to have a plastic twist slot or screw together system to make it easier to break down the rocket into two or more segments for transport.

They are not screw on or anything like that, but I might consider friction fitting a couple of the pieces for transport.





Also, last night I placed an order from Erockets for the rest of the parts!

 

[ljwilley]

Anyone want to see a timelapse video of the Honest John fincan printing?

 

[Leo]

I've uploaded an alternative Nike-Nike adapter with BT-55 pass through.

 

[ljwilley]

I've uploaded an alternative Nike-Nike adapter with BT-55 pass through.
View attachment 655807

I won't waste filament and print another one, the one I have works fine. But This is great for anyone else who wants to print this in the future!

 

[bad_idea]

I have printed the nose cone hollow with 4 layer walls, and the fincan was printed on normal settings. No rafts, supports. Also thank you so much for putting this on thingiverse; this is literally the coolest thing I have every tried to 3d print!

Apologies if I missed it, but what filament are you using?

This looks like a fun project. Great design @Leo !

 

[ljwilley]

Hatchbox PETG

 

[ljwilley]

Also, just finished the fixed Nike fin cans. The only thing I don't like is how thin they are. I am now printing some pieces to go on the inside of the fincans to strengthen them, one being longer to suffice for a coupler for the lower Nike booster.

 

[ljwilley]

Super cool that you are tackling this project. Looking forward to seeing how you come along.

Please post your printer settings for each part you printed so everyone has a general idea as a starting base.

Info: Don't forget to remove the support ring on the Hydac fincan, as per instructions.

I see there is a few pictures of the finished parts on thingiverse. Did you every finish one of these? I would like to see it!

 

[BDB]

Following. This is exactly the kind of project I'm looking for right now.

 

[ljwilley]

Following. This is exactly the kind of project I'm looking for right now.

Thanks!

Also, another update: It looks like I am just about out of PETG filament, so I will need to get some more. Hopefully I will find some with fast shipping from amazon.

 

[Leo]

I see there is a few pictures of the finished parts on thingiverse. Did you every finish one of these? I would like to see it!

All the parts were finished and are posted on the Thingiverse site. Let me know if you need additional pictures.

 

[ljwilley]

All the parts were finished and are posted on the Thingiverse site. Let me know if you need additional pictures.

I mean did you ever finish one of the rockets.

 

[Leo]

I mean did you ever finish one of the rockets.

I put the rocket together to see that all parts fit but it's not in a flyable state. This is why it is still under "Work in Progress". There are many variations on parachute placement or actually building a 4-stager. That is why I'm keen to see how others are putting it together.

 

[Raythain]

Looks like a cool project. Just downloaded myself a copy, not that my build pile needed to get any bigger.

How much do your printed parts weigh? Thinking about firing up OR and trying to model a 4 stage version.

 

[frogglicker]

 

[ljwilley]

How much do your printed parts weigh?

I will measure the wight and post when I have done so

Thinking about firing up OR and trying to model a 4 stage version.

 

[frogglicker]

I will measure the wight and post when I have done so

 

[ljwilley]

Another update- The couplers on the Nike fincans are way to fragile- the both broke. Just too flimsy when printed in vase mode. I am going to print some special couplers to fit the other Nike fincans that I made earlier that were too thick to use normal couplers. @Leo, if you want to design some fincans that work better, you can, but I won't use them because I already have 2 of them that I can use. You may consider doing it though, for those who aren't good a CAD and don't know how to design special parts. Anyway, I have painted the nose cone and fincan for the Hydac sustainer:

How much do your printed parts weigh?

Okay, Okay, I will!

Hydac nose cone, 4 layer shell thickness, 0% infill, Painted blue: 14.00 g
Hydac fincan, printed 100% infill, painted blue: 14.56 g
Honest John Fincan, printed at 15% infill, no paint: 135.59 g
Both honest john-Nike transition pieces, printed at 15% infill, no paint: 32.75 g
Nike-Nike adapter, 15% infill, hole drilled in middle, no paint: 22.66 g

That's all I got as of now. I ran out of filament and some will come on the 15th.

 

[ljwilley]

Also, here is a picture of the real thing. I forgot to post it in the first post:

 

[Leo]

I'll say it again.... don't forget to remove the built-in support on the Hydac fin can. You are losing out on the details which I put a lot of effort into.

"The couplers on the Nike fincans are way to fragile- the both broke. Just too flimsy when printed in vase mode."

This is surprising! With my print I'd have to put some real force on them to break. Did you print with 0.8mm shell thickness as per instructions?
Nonetheless, I'll see if I can come up with a working version for standard print in case others may have the same issue.

 

[Leo]

Looks like a cool project. Just downloaded myself a copy, not that my build pile needed to get any bigger.

How much do your printed parts weigh? Thinking about firing up OR and trying to model a 4 stage version.

I don't recommend downloading the files as you might miss out on updated files. As long as the project is "Work in Progress" the files might get updated without revisions. Wait until you decide to start printing the parts before download.