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08-07-2017, 08:14 PM
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Join Date: Jan 2016
Location: Northern Colorado
Posts: 276
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So my 11 year old bought a 3d printer...
Actually, I did, and she's paying installments. I've never messed around with one until now, and I'm already hooked.
I've seen these cool little paracord rope lock things, and found a design online, scaled it up, and tried it out for some quick adjustable tie downs. I'm pleased with how they came out. I reinforced a bit from the original, but I don't know if that was necessary.
I made another couple hat were more like the rope cinches you'd see on a tent. I'm gonna use both and see how they work out...but pretty cool what can be done with some time and a couple of dollars worth of stuff that looks like weed eater line!
(I don't have to get on my knees to test them out on dads 182...  )
__________________
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Scott
1995 RV-4 bought from original builder 
1993 RV-6 (sold to good home) 
2002 Rans S7 Courier
Double exempt but happy to contribute! Dues paid 2016-2018
www.know-love.org
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08-08-2017, 01:30 PM
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Join Date: Jan 2016
Location: Northern Colorado
Posts: 276
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A little more engineering needed...
An unscientific break test had the figure 9 doohickey break at an estimated 150lb steady pull (not a "snatch").
I'll do some playing and see if I can make it stronger and more viable.
This 3d printer sure is something else, if nothing else than for seeing models of "real" machined stuff without spending the money to machine until you know it's gonna work.
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Scott
1995 RV-4 bought from original builder 
1993 RV-6 (sold to good home) 
2002 Rans S7 Courier
Double exempt but happy to contribute! Dues paid 2016-2018
www.know-love.org
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08-08-2017, 01:36 PM
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Join Date: Oct 2012
Location: Clearwater, FL KCLW
Posts: 1,281
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Could you share which model you bought? I am thinking about getting one as well.
Chris
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Chris Johnson
RV-9A - Done(ish) 4/5/16! Flying 4/7/16
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08-08-2017, 01:46 PM
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Join Date: Feb 2011
Location: USA
Posts: 3,179
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Scott, depending on the capabilities of the printer, different filament material (as well as print infill settings) will change your part strength.
Things to check is whether the printer capable of printing PETG? ABS? Nylon?
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08-08-2017, 03:03 PM
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Join Date: Aug 2012
Location: Panama City, FL
Posts: 132
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I recently acquired a Purusa i3 MK2 kit; great reviews on print quality and easy to assemble. Great thing is you can print your own spare/replacement parts. Software apps included are excellent. Even has an option to automatically use up to four different filaments when printing a part.
I have printed a few parts like zip tie mounts from 3D parts files available in the builders forum at https://electricmotorglider.com/. Found the site through EAA/Brian Carpenter's Hints for Home builders videos on 3D printer parts. Still experimenting with layer thickness vs quality vs print speed, bed and nozzle temps, etc. Finally getting the hang of printing with PLA, no luck on my ABS attempts so far.
John Salak
RV-12 N896HS
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08-08-2017, 03:08 PM
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Join Date: Oct 2009
Location: Victoria, BC, Canada
Posts: 3,932
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My new 3D printer is also a Prusa i3 MK2. Warning - There's about a 7-8 week lead time just for the kit version of this printer. Add 2-3 weeks for a fully assembled one. It was the top rated 3D printer in the last Make Magazine shootout. It works great, and was cheap. Anyone who builds or maintains RV's should have no trouble assembling one, it'll take you most of a day.
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Rob Prior
1996 RV-6 "Tweety" C-FRBP (formerly N196RV)
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08-08-2017, 03:10 PM
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Join Date: Dec 2009
Location: Boulder, CO
Posts: 4,435
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The goal would be to have it break above 800 pounds, which appears to be around what RV-3B tiedowns will see in a 70 mph wind.
An additional concern is whether there is any possibility at all that in a highly gusty and dynamic environment, the rope can possibly slip or lose tension. I've been in strong conditions and have seen aircraft destroyed because of that. So far, I haven't seen anything better than good rope and several half-hitches.
Good luck with the development!
Dave
RV-3B now skinning the tailcone
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08-08-2017, 03:43 PM
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Join Date: Jan 2016
Location: Northern Colorado
Posts: 276
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Answers and guesses
In extreme winds, I'd tie it off (or get it the heck out of there...) I wouldn't depend on any extraneous stuff, especially not something I made with a technology I am just learning. My paint may not be show quality, but I try not to leave my airplane out much more than overnight for a visit somewhere.
I'm looking for something that is reasonably reliable and easy, especially for my folks to use on their aircraft for basic nice day tie down when they fly somewhere for breakfast or lunch...and mostly just toying around with the printer.
I've got some ABS filament inbound, so I'll try that, and I'm going to try to modify the fill shape to triangles and up the fill content. (Didn't know I could do all that until today)
I (she) got the Lulzbot Mini...they are about $1250 (!!) on Amazon and she's been saving. When I saw she was serious I started lurking craigslist...eventually I found a guy with more toys than money who seemed legit, and I paid $450 for it with a roll of PLA filament.
Lulzbot is located just 30 minutes or so from my house, I understand they will service stuff, and many of their machine parts are actually printed on a 3d printer.
I'll check the link posted above--if anyone else has links with aviation themed printing info (besides here of course), I'd love to see what folks are dreaming up.
__________________
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Scott
1995 RV-4 bought from original builder 
1993 RV-6 (sold to good home) 
2002 Rans S7 Courier
Double exempt but happy to contribute! Dues paid 2016-2018
www.know-love.org
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08-08-2017, 03:53 PM
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Join Date: Feb 2011
Location: USA
Posts: 3,179
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You've got a great printer with the Lulzbot Mini.
The printer uses 3mm (most often its 2.85mm) filament. That printer can print nylon. We used a Mini to print nylon sprockets for a FRC robot and even at 20% infill, those things took an incredible beating and kept working.
The Lulzbot edition of Cura with the breadth of Lulzbot profiles makes it easy to use a wide range of filament material. With those profiles, nylon is as easy to print as ABS.
Your 11yo has good taste in technology!
Last edited by humptybump : 08-08-2017 at 05:00 PM.
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08-08-2017, 04:14 PM
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Join Date: May 2008
Location: Martinsville, IN
Posts: 454
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Taulman 3d has a wide variety of copolymers (PET and Nylon) that fill a wide bill of applications requiring ductility and strength. I also use Polycarbonate where absolute toughness is needed.
These aren't as simple to print with as ABS or PLA but they are worth the effort. Bottle holder and strap shown below are polycarbonate:
Don
Last edited by dtw_rv6 : 08-08-2017 at 04:50 PM.
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