3D Printing What Are You Printing Today?

Onebadhawk
the rocketry show
Wildman Rocketry
The Rocketry Forum

Help Support The Rocketry Forum:

This site may earn a commission from merchant affiliate links, including eBay, Amazon, and others.
98 mm stepped bulkheads for AV bays made from LOC couplers.

IMG_3168.jpg

Left to right: Anycubic Red, Sirya Blu, and Fun-to-Do Industrial Blend. The last one had a little Z-wobble, so I’m reprinting it right now.

Next step: Destructive testing!
 
Did prototypes for my 38mm min diameter build.

35mm sleds which interlock to give a double-decker sled. Planning to fit my RRC3 on one side, mag switch plus lipo battery on the other.

IMG_7976.jpg
IMG_7975.jpg
 
Printing a new lower airframe with the fins of my all 3D printed original design the ThunderPass II, version 5. Here's the new part just after its IPA wash, awaiting to get a post-cure. It was printed on the Form 2 sla printer with their tough resin.
IMG_0018.jpeg
The design has been evolving over the past 18 months. Here it is before last Saturday's launch:
IMG_0016.jpeg
It flew with a re-attached fin to 966' on a Q-Jet C12-6 (parachute recovery) with the descent rate of 23.1 f/s re-breaking the fin at the root. The previous flight had been to 944' on the C12-6 (streamer recovery) with a descent rate of34.7f/s (yikes!) which snapped the fin upon hitting very hard, dry ground. Evidently, the tough resin, which is more like ABS and has good elongation properties, can't handle 34.7f/s impacts to a fin on hard ground :)

Thus, I've beefed up the root area on this version. Basic info is approximately 1" diameter, 15.2" length, 3.8" span, 3oz weight without motor (due to the resin I'm using). The parts screw together and there is a small payload bay designed for a Firefly altimeter at the base of the nose cone. I have flown versions printed with PLA and other resins.

I'll be posting f360 design files, stl's, and Rocksim files late this month after I return from vacation along with a write up how it evolved to this version.
 
I'm trying to print a leg for the Aero-Pad, which was a Fun Rockets product that never came out. It's one of my longer prints so far and certainly also the longest in length.
 
memcbride said:
Printing a new lower airframe with the fins of my all 3D printed original design the ThunderPass II, version 5. Here's the new part just after its IPA wash, awaiting to get a post-cure. It was printed on the Form 2 sla printer with their tough resin.
View attachment 394655
The design has been evolving over the past 18 months. Here it is before last Saturday's launch:
View attachment 394656
It flew with a re-attached fin to 966' on a Q-Jet C12-6 (parachute recovery) with the descent rate of 23.1 f/s re-breaking the fin at the root. The previous flight had been to 944' on the C12-6 (streamer recovery) with a descent rate of34.7f/s (yikes!) which snapped the fin upon hitting very hard, dry ground. Evidently, the tough resin, which is more like ABS and has good elongation properties, can't handle 34.7f/s impacts to a fin on hard ground :)

Thus, I've beefed up the root area on this version. Basic info is approximately 1" diameter, 15.2" length, 3.8" span, 3oz weight without motor (due to the resin I'm using). The parts screw together and there is a small payload bay designed for a Firefly altimeter at the base of the nose cone. I have flown versions printed with PLA and other resins.

I'll be posting f360 design files, stl's, and Rocksim files late this month after I return from vacation along with a write up how it evolved to this version.
Click to expand...
Just curious, why the print at that angle? vertically would not need supports. and you could make it a little shorter if your print volume was the reason. (Or two pieces, separated at that groove just above the fins) The top one could be replicated to add extra length...
 
beeblebrox said:
Just curious, why the print at that angle? vertically would not need supports. and you could make it a little shorter if your print volume was the reason. (Or two pieces, separated at that groove just above the fins) The top one could be replicated to add extra length...
Click to expand...

Good question. It has to do with being printed by a liquid resin sla printer. The print hangs upside down from the build plate. For each layer, the build plate drops into the tray of liquid resin which has a clear elastic bottom. Laser light is precisely shown into the liquid resin at each point to be cured. Once a layer is finished, the build plate gently “peels” the build up off the resin tray with the new layer added. Printing at angle can help in making the peeling process successful. And printing vertical tubes tends to have the laser going through the same spots on the elastic more frequently reducing the useful life of the tray.

The diameter of the support points can be set based on the model requirement. The supports come off easily and the attach points wet sand down with 400-600 grit. Given the incredibly higher quality of the sla print for a given layer height compared to a fdm printer, the inconvenience of cleaning up the support marks is a fair trade off for me.

As an aside, I tend to print parts on a fdm printer during iteration in the design and testing process and the final parts on the sla for the higher quality.
 
memcbride said:
Good question. It has to do with being printed by a liquid resin sla printer. The print hangs upside down from the build plate. For each layer, the build plate drops into the tray of liquid resin which has a clear elastic bottom. Laser light is precisely shown into the liquid resin at each point to be cured. Once a layer is finished, the build plate gently “peels” the build up off the resin tray with the new layer added. Printing at angle can help in making the peeling process successful. And printing vertical tubes tends to have the laser going through the same spots on the elastic more frequently reducing the useful life of the tray.

The diameter of the support points can be set based on the model requirement. The supports come off easily and the attach points wet sand down with 400-600 grit. Given the incredibly higher quality of the sla print for a given layer height compared to a fdm printer, the inconvenience of cleaning up the support marks is a fair trade off for me.

As an aside, I tend to print parts on a fdm printer during iteration in the design and testing process and the final parts on the sla for the higher quality.
Click to expand...
Cool, Thanks! just wanted information. There is the ERRF convention in Maryland 10/12-13 Hoping to see all the latest stuff, might get another printer soon. At the least maybe some show specials on filament and parts.
 
Bill Hanson said:
Finished my bulkheads with integrated charge wells for my 38mm min diameter build.
Click to expand...
Can I suggest you may get more reliability if you make the two wells separate on the right-hand part? A failure on the z-axis when the first charge goes off could dump the BP from the second well if it ruptures, preventing the secondary charge acting.
 
memcbride said:
Printing a new lower airframe with the fins of my all 3D printed original design the ThunderPass II, version 5. Here's the new part just after its IPA wash, awaiting to get a post-cure. It was printed on the Form 2 sla printer with their tough resin.
Click to expand...

Beautiful print result!
 
Ich habe ein neues Formular für einen Nasenkegel gedruckt. Der bedruckte Nasenkegel ist ständig kaputt.
 

Attachments

  • 20191003_185124.jpg
    20191003_185124.jpg
    52.8 KB · Views: 99
  • 20191003_203234.jpg
    20191003_203234.jpg
    53 KB · Views: 105
  • 20191005_110228.jpg
    20191005_110228.jpg
    67.7 KB · Views: 101
I am developing 3D printed, modular, bolt-on fin cans for model rockets. This is a mashup of rev 1 and rev 2 for BT70, 56mm tubing. Make sure to follow the link in the video description to the files on Thingiverse so you can print your own. I could not quite finish the model in time for last Saturday's SARA Volunteer Launch. So look for it soon, sporting the 4k Action Camera. Stay tuned!

#3DPrinted #Modular #ModelRocket #FinCan #56mm #BT70
 
I have printed a mobile case for the Eggfinder LCD. The file can be found on Thingiverse.
 

Attachments

  • 20191022_223843klein.jpg
    20191022_223843klein.jpg
    58.4 KB · Views: 58
Bill Hanson said: ↑
Finished my bulkheads with integrated charge wells for my 38mm min diameter build.

OverTheTop Can I suggest you may get more reliability if you make the two wells separate on the right-hand part? A failure on the z-axis when the first charge goes off could dump the BP from the second well if it ruptures, preventing the secondary charge acting.

Ditto, separate wells, but for another failure reason. The 1st well could set off both charges because of close proximity, and then you might rupture your body tube.
 
curtisheisey said:
Bill Hanson said: ↑
Finished my bulkheads with integrated charge wells for my 38mm min diameter build.

OverTheTop Can I suggest you may get more reliability if you make the two wells separate on the right-hand part? A failure on the z-axis when the first charge goes off could dump the BP from the second well if it ruptures, preventing the secondary charge acting.

Ditto, separate wells, but for another failure reason. The 1st well could set off both charges because of close proximity, and then you might rupture your body tube.
Click to expand...


Here is a version that I made to hold two centrifuge tubes....20170417_194645.jpg

Have subsequently changed this design to completely cover the top of the bulkhead, but you get the idea.
 

Similar threads

Dave A
3D Printing Newbie here to 3D Printing.
Replies
4
Views
529
cwbullet
cwbullet
ljwilley
3D Printing 3d printed glider for rockets
Replies
0
Views
578
ljwilley
ljwilley
Ray Lecture
Upscale Estes Venus Probe Build Thread
Replies
24
Views
914
Blast it Tom!
Blast it Tom!
bdureau
TTGO Altimeter
2
Replies
31
Views
2K
311stylie
3
sed6
3D Printing 3D Printed Phoenix Missile
Replies
5
Views
573
pfhorwath
pfhorwath

Latest posts

Back
Top