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  #21  
Old 05-25-2019, 03:21 AM
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ghrocketman ghrocketman is offline
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That Amazon price is about 40% lower for 33% more product.
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When in doubt, WHACK the GAS and DITCH the brake !!!

Yes, there is such a thing as NORMAL
, if you have to ask what is "NORMAL" , you probably aren't !

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  #22  
Old 05-25-2019, 02:20 PM
Jack Hydrazine Jack Hydrazine is offline
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Quote:
Originally Posted by teflonrocketry1
I know from experience with other 3D printed fin-cans that 1/16" thick PLA fins won't hold up very well for flights or landings or even sitting in a hot car.


PLA has a glass transition temperature of 60–65 °C (140 F - 149 F) and a melting temperature of 173–178 °C (343.4 F - 352.4 F).

PETG has a glass transitition temp of 80 C (176 F) and a melting temp of 210 - 250 C (410 - 482 F).

You can increase the strength of PLA. Steve Jurvetson made a fin can with PLA for his daughter's rocket and flew it past Mach several times. The key was coating it with some epoxy.
https://www.thingiverse.com/thing:630069

Video about it starts at the 11:00 mark.
https://www.youtube.com/watch?v=IBMMPBpZeHo
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  #23  
Old 05-25-2019, 09:05 PM
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teflonrocketry1 teflonrocketry1 is offline
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Quote:
Originally Posted by Jack Hydrazine
I recently learned about low-warp ABS being for sale on the retail market. I haven't tried it, but if you really want to print with ABS this might be the way to go.

https://www.pushplastic.com/product...rp-abs-filament

https://www.amazon.com/HQA-ABS-LW-3...t/dp/B07BWGMPDL


Jack,

I am aware of the low warp ABS, I haven't purchased any since it is over my $17/kg price point for filament.

I purchased some 3/4" thick foam board for $8.38 from Home Depot:

https://www.homedepot.com/p/3-4-in-...50705/202090272

and built an insulated enclosure (R2.89) for my 3D printer today, see attached picture. I am attempting to print a 1340/20 fin-can in ABS filament again, at high resolution it takes about 6 hours, if this works, problem solved.
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  #24  
Old 05-26-2019, 12:41 AM
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It worked!, see first picture! I opened the enclosure 6 hours later and found an almost perfect ABS print of the 1340/20 fin-can with no warping or splitting. The second picture shows the latest print detached from the supporting material next to the ABS print from before that has warped and split fins. This ABS print is strong and flexible and very flight worthy.
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  #25  
Old 05-26-2019, 04:58 AM
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Jerry Irvine Jerry Irvine is offline
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Quote:
Originally Posted by teflonrocketry1
It worked!, see first picture! I opened the enclosure 6 hours later and found an almost perfect ABS print of the 1340/20 fin-can with no warping or splitting. The second picture shows the latest print detached from the supporting material next to the ABS print from before that has warped and split fins. This ABS print is strong and flexible and very flight worthy.
I would be proud to try a set and fly them with photos.
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  #26  
Old 05-26-2019, 07:53 AM
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ghrocketman ghrocketman is offline
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VERY NICE, Bruce !
Put me in line for wanting one of your orange fin cans !
Really !
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When in doubt, WHACK the GAS and DITCH the brake !!!

Yes, there is such a thing as NORMAL
, if you have to ask what is "NORMAL" , you probably aren't !

Failure may not be an OPTION, but it is ALWAYS a POSSIBILITY.
ALL systems are GO for MAYHEM, CHAOS, and HAVOC !
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  #27  
Old 05-26-2019, 03:37 PM
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ratchetman ratchetman is offline
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I agree, very well done Bruce, bravo!
I also would be pleased to be in line to obtain one of those fin cans. Red would be great.
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  #28  
Old 05-26-2019, 04:40 PM
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astronwolf astronwolf is offline
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Great job, Bruce.
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  #29  
Old 05-30-2019, 11:11 AM
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Quasar Quasar is offline
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Quote:
Originally Posted by teflonrocketry1
I will attempt to rework the 3D file with the software (Blender) that I am learning to use.


Blender is a really powerful CG program that I've been playing around with, too. Below is a 3D model of a Cherokee-D that I made with Blender.

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  #30  
Old 05-30-2019, 06:00 PM
Jack Hydrazine Jack Hydrazine is offline
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Quote:
Originally Posted by teflonrocketry1
It worked!, see first picture! I opened the enclosure 6 hours later and found an almost perfect ABS print of the 1340/20 fin-can with no warping or splitting. The second picture shows the latest print detached from the supporting material next to the ABS print from before that has warped and split fins. This ABS print is strong and flexible and very flight worthy.


How hot was the ambient temperature of the print chamber during printing?
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