3D Printing Anyone printing an ejection baffle/baffle parts?

[Zyzzyva1000]

I just finished printing a design for a 3" honest John I found on Thingiverse, and happened to find a 3" Loc coupler in my pile o' random tubes. Seems that lots of designs are just discs with a series of radially distributed holes, with one end having the holes further from the center, and one end with them closer to the center. A simple centering ring generator in openscad will make this. I was going to make the discs a few mm think and print in ABS and then use maybe half the coupler length as the baffle. Make a 1/4" center hole for a shock cord mount in the forward disc.

Anyone tried this? I figure ABS is a reasonable place to start, though I could try PC or ASA too.

 

[bobbyg23]

I just finished printing a design for a 3" honest John I found on Thingiverse, and happened to find a 3" Loc coupler in my pile o' random tubes. Seems that lots of designs are just discs with a series of radially distributed holes, with one end having the holes further from the center, and one end with them closer to the center. A simple centering ring generator in openscad will make this. I was going to make the discs a few mm think and print in ABS and then use maybe half the coupler length as the baffle. Make a 1/4" center hole for a shock cord mount in the forward disc.

Anyone tried this? I figure ABS is a reasonable place to start, though I could try PC or ASA too.

Like this?

 

[Zyzzyva1000]

Like this?

No, like this: https://www.apogeerockets.com/Building_Supplies/Parachutes_Recovery_Equipment/Ejection_Baffles

I have made plenty of parts for ebays and printed charge wells (I guess if printed charge wells hold up, there's no reason this wouldn't). I was just curious if people had tried this type of design. There's also the Loc design that uses offset tubes, and the Aerotech design that uses steel wool.

 

[Huxter]

I beg to differ - like this (3d printed - hello)

https://www.thingiverse.com/thing:3032694
Scale it up a bit... Use transparent petg...

 

[Zyzzyva1000]

Well we will see how it works. Appears to be essentially the same as the plywood versions. I printed it in ABS with 4 walls and 35% infill, seems quite sturdy. Have to actually epoxy it together but seems like it should work. Will still put some dog barf in.

 

[Joshua Smith]

Well we will see how it works. Appears to be essentially the same as the plywood versions. I printed it in ABS with 4 walls and 35% infill, seems quite sturdy. Have to actually epoxy it together but seems like it should work. Will still put some dog barf in.

you can also use steel wool, tho I have never done so personally. In the one you printed, does it have the half moons inside, or a similar snaking path for the gases, or is it just the central holes on one end and the peripheral holes on the other end? I find I like the snaking ones like Dave's
http://www.qualmanrocketry.com/Baffle BT plywood.html otherwise I'm worried they'll only act as a laundry shelf

 

[Zyzzyva1000]

you can also use steel wool, tho I have never done so personally. In the one you printed, does it have the half moons inside, or a similar snaking path for the gases, or is it just the central holes on one end and the peripheral holes on the other end? I find I like the snaking ones like Dave's
http://www.qualmanrocketry.com/Baffle BT plywood.html otherwise I'm worried they'll only act as a laundry shelf

I did not do anything beyond just the central and peripheral holes. I suppose I could have stuck steel wool in there, but it could never be replaced. I have had kits with baffles similar to this before, and I still usually use some insulation. My only real goal is to catch the flying bits of black powder. If nothing else it is a nice little shelf that keeps the laundry from falling all the way to the ejection well and makes it easier to have a nice layer of insulation. I will have to report back once I am finally able to fly it.

 

[Joshua Smith]

I did not do anything beyond just the central and peripheral holes. I suppose I could have stuck steel wool in there, but it could never be replaced. I have had kits with baffles similar to this before, and I still usually use some insulation. My only real goal is to catch the flying bits of black powder. If nothing else it is a nice little shelf that keeps the laundry from falling all the way to the ejection well and makes it easier to have a nice layer of insulation. I will have to report back once I am finally able to fly it.

Yeah, I usually put a little something in there depending on the chute material. I too have some rockets where the baffle is fine, but the real advantage is the shelf. Good luck!