3D Printing BT-5 to BT-20 Transition

[Jack Hydrazine]

Here's another hobby rocketry 3D model for anyone and everyone to download for free from Thingiverse and print on their 3D printers.

This 3D object is a transition from Este BT-5 tubing to BT-20 tubing. The distance between the two sizes of tubes (transition taper length) is 0.75 inches (19.0mm).

There are three models:
1) Solid,
2) Solid with a 4.0mm hole to allow for screw eyes to be fastened to it,
3) Hollow.

https://www.thingiverse.com/thing:4921365

 

[boomtube-mk2]

It would be interesting to compare the weight differential between a hollow-plastic printed transition and a traditional balsa transition.
I'm pretty sure the solid plastic would weight more, possibly a lot more if weight is a serious concern.

Now; does the hollow transition have a fore and aft closure or is it "Blow-through"?

 

[Jack Hydrazine]

The hollow one is blow-through. You can take the solid one and vary the infill from zero (hollow) to 100 percent (solid). I would suggest about 10% to 15% to keep it light. I would suggest about two or three walls of thickness.