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  1. #31
    Join Date
    21st March 2017
    Location
    Tennessee
    Posts
    80
    Here is .stl file of the design. Hatchbox black ABS printed at 230C, and bed at 100C. 100% infill. Speed was 40 mm/s. No supports but I do use a 6mm brim though. 0.4mm nozzle, and 0.2mm layer height. First layer and brim at 30mm/s.

    I might add, that I insulated the underside of the heat bed with cork, so I can get very consistent bed temperature there.

    I use an enclosure, and pre-heat that. If I can get chamber to 40C by bed and extruder heat alone, I call it OK. I use a glass build surface cleaned with isopropyl alcohol and then sprayed with Aquanet Extra Super Hold hairspray. I usually get tenacious bed adhesion at build temperature, and when it cools to room temperature I can usually just lift the print off by hand.

    38mm Motor Retainer.zip


  2. #32
    Join Date
    21st March 2017
    Location
    Tennessee
    Posts
    80
    I was doing a bit more investigation on using ABS 3D printed parts for high power rocket components. I came across this Thingiverse page, where the contributor made nose cone, motor mount, rail buttons, and even the fins from ABS. The fins slide into the motor mount through slots in the tube. He states that the rocket has flown 7 to 8 times with no apparent issues reported. I find this very interesting. There is also a linked video of the rocket flying, as well as an .ork file embedded in the download.

    I can see more of my ABS filament being consumed in the coming weeks.

    https://www.thingiverse.com/thing:2472771


  3. #33
    Join Date
    10th July 2007
    Location
    Melbourne, Australia
    Posts
    1,267
    3D printing is great. I have transitions and a 4" NC on my Nike Apache. Our work printer uses ABS. Build thread here is you are interested. https://forum.ausrocketry.com/viewtopic.php?f=6&t=5019

    I should get the STL files and post on Thingiverse one day.

    I have also done a 3" conical NC to suit the other conifguration for the NA. It takes the same sled.
    TRA 13430, Level 3

    "Everybody's simulation model is guilty until proven innocent" (Thomas H. Lawrence 1994)

  4. #34
    Join Date
    21st March 2017
    Location
    Tennessee
    Posts
    80
    What I find most interesting in the thingiverse link I posted, is that the motor mount has the motor retainer integral with it. The cap threads onto that, much like the standard two piece epoxy bonded type does. 7 to 8 flights with 38mm motors, and not one word about "melting" of any parts.

  5. #35
    Join Date
    10th July 2007
    Location
    Melbourne, Australia
    Posts
    1,267
    Isn't it good when the myths are dispelled
    TRA 13430, Level 3

    "Everybody's simulation model is guilty until proven innocent" (Thomas H. Lawrence 1994)

  6. #36
    Join Date
    22nd September 2017
    Posts
    639
    Yup. Machinist told me we couldn't have NaCA65A airfoils. Said impossible to CNC. And I got someone to SLS print what I designed. Because NASA doesn't think the general public should have NACA65A airfoil generators. NASA underestimates the general public of engineering students on coffee and excel yo with a copy of Solidworks... UTC SEDS competitions yo..

    After placing third. NASA spokeswoman at SEDS SpaceVision says "I can not comment on that at this point in time." Screw NASA and it's you shouldn't have NACA65A airfoil generator attitude. NASA meet Excel..
    Last edited by Andrew_ASC; 7th December 2017 at 12:46 PM. Reason: Datapoints are unclassified. NASA won't release it. ROFL.

  7. #37
    Join Date
    22nd September 2017
    Posts
    639
    They don't want you or North Korea making supersonic zero lift airfoils. Lol.

  8. #38
    Join Date
    22nd September 2017
    Posts
    639
    Curve by equation and import by X,Y,Z points are the best things for rocketry with 3D programs.

  9. #39
    Join Date
    22nd September 2017
    Posts
    639
    Nytek1200CF by Stratasys has a good thermal load for 3D printable plastics. I was a tad disappointed in its strength. It is expensive. You could have a 6061T6 aluminum bar machined cheaper. Nylon itself is alright too. I dislike ABs outside of an AV bay. Low thermal load.

  10. #40
    Join Date
    22nd September 2017
    Posts
    639
    Machinist was impressed about printed airfoils. Guy is a metal snob. He had worked on tomahawks before being university machinist. He knew all about its jig process. But those tactics don't work for such small scale models. It starts with cones then retainers and soon you're trying airfoils like flavor of the month.

  11. #41
    Join Date
    22nd September 2017
    Posts
    639
    What's funny is you can't CNC based on a tool bit size and that's where the 3D print excels. A real dork would cast something from the print to save money in long haul or use better material.

  12. #42
    Join Date
    22nd September 2017
    Posts
    639
    If part size is too small the tooling itself has radius too large.

  13. #43
    Join Date
    22nd September 2017
    Posts
    639
    Quote Originally Posted by OverTheTop View Post
    Isn't it good when the myths are dispelled
    I guess the most amazing thing is the ABS isn't melting. But neither was rocketpoxy.

  14. #44
    Join Date
    12th September 2013
    Location
    SE Wisconsin
    Posts
    1,032
    My upscale Quinstar has a 38mm upscale of the thingiverse retainer printed in PLA, as pictured above. Doesn't seem to have thermal problems with 38mm Gs. Cracks on landing :-(

    I've also downscaled those retainers all the way to 13mm.
    Charles McGonegal
    Ciderwright at AeppelTreow Winery & Distillery
    www.appletrue.com
    NAR #103560 L1 6/25/17 Estes Leviathan CTI H175-SS
    Ad Astra Tabernamque!

  15. #45
    Join Date
    23rd January 2015
    Location
    Draper, UT
    Posts
    92
    I don't know why more people don't print with PETG. Prints at 255C, no toxic fumes, MUCH stronger than PLA, food and dishwasher safe. It's (almost) all I print any more. It doesn't bridge as well as PLA or it would be perfect!
    Let us create vessels and sails adapted to the heavenly ether, and there will be those who will not shrink from even that vast expanse. - Kepler to Galileo in 1610

    NAR 86500
    Level 2

  16. #46
    Join Date
    22nd August 2015
    Location
    Rhode Island
    Posts
    1,144
    Does anyone print in nylon? I was looking at a couple printers this weekend as a possible Christmas gift to myself, and I thought nylon might be interesting for our high-temp applications.
    NAR #100940, RIMRA & CMASS
    L1 - 4/17/16, Tyrannosaur (by Binder Design), Loki H144
    L2 - 8/19/17, Terrordactyl (by Binder Design), CTI J250

  17. #47
    Join Date
    23rd January 2015
    Location
    Draper, UT
    Posts
    92
    I print aerodynamic rail buttons in Nylon 910. A bit fiddly to work with, any strings are like trying to break mono-filament fishing line, but very strong and somewhat flexible. The biggest issues are that it absorbs moisture like a sponge, not a huge deal where I live, and no colors.
    Let us create vessels and sails adapted to the heavenly ether, and there will be those who will not shrink from even that vast expanse. - Kepler to Galileo in 1610

    NAR 86500
    Level 2

  18. #48
    Join Date
    5th February 2009
    Location
    Montreal, Qweebec
    Posts
    3,402
    Nylons tend to be expensive, and a higher heat setting is typically needed (~250C). And, I've never used / printed with it.

    One thing a lot of seem to forget, is that we're building things quickly, out of a layered & deposited strand of plastic. These plastics were meant to be molded; heated to 'liquid' temperatures and injected into fully enclosed molds, then quickly cooled & removed. So that the part is one solid piece. It's "cool" 'cuze we can build something '3D' without pricey molds and 40+ tonne injection presses. But expecting it to replace established methods and materials in foolish.

    Can I print a 54mm retainer, sure. I can design one too. (and put it thru our FEM lab if so inclined). Would I? No, I'll stick with a proven machined aluminum part. it's one solid piece, not plastic, and I don't have to futz with it. Would I print a camera shroud? Sure. An altimeter sled, probably. The scale model of the P&W J75? definitely..
    Last edited by dr wogz; 7th December 2017 at 11:50 PM. Reason: added other thougths
    -paul

    NAR# 101258 - L1
    www.CRMRC.org
    I don't know the same things you don't know..

  19. #49
    Join Date
    19th January 2009
    Posts
    944
    I print nylon, it's a pain sometimes. It warps easily, requiring an enclosure. It also needs very high temperature compared to PLA etc, and bed heating. PETG is a favorite of mine. Strong, easy to print, no fumes, lots of color options... For most things, nylon creates more problems than it solves. Same with Polycarbonate.

  20. #50
    Join Date
    25th June 2014
    Posts
    773
    I print Nylon for Rail buttons, PETG for everything else. So far so good. Even the 54mm retainers. I will say to get a strength I'm comfortable with, I make them thick. They come in at nearly 4 Oz.
    Click image for larger version. 

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  21. #51
    Join Date
    18th October 2016
    Posts
    497
    <Deleted. Sorry, wrong thread.>

    Last edited by GrouchoDuke; 8th December 2017 at 09:42 AM.
    TRA L2. I-class record: "Vanish 29" with an I224, 14,596ft, Mach 1.92. Video here.

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