This is an experimental fixture for launching and receiving sound waves on a 1-inch pipe, for a sonar type distance measurement. One example is measuring water depth in a well. This is simply a partial elbow with the same inside diameter as the pipe, so it maintains the same acoustic impedance as the pipe. There are recessed mounting positions for a 9.8 mm diameter electret mic such as the PUI AOM-5024L-HD-R, and a 38 mm tweeter such as the "ToToT Ultrasonic Speaker Piezo" from amazon.com/gp/product/B07RW7ZNB4. There is also a 1 mm diameter hole for a wire parallel with the pipe axis, to suspend a reference target at a given distance down a (vertical) pipe. The end facing the pipe has the same OD as the pipe, so the part sits flush on the pipe end and is mechanically coupled to it using a separate outer sleeve of the correct diameter (1-inch schedule 40 PVC pipe, OD=33.5 mm) which is the part named "Pipe_Sleeve". This sleeve was not made integral to the part, due to printing limitations.

Although there are few somewhat steep overhanging surfaces, the part printed OK as shown with no support, in an Ultimaker 2 using ABS.

Photos of related experiments at https://photos.app.goo.gl/mU1tzFkzA6uq25Du5

Ultimaker

Ultimaker 2

No

No

0.1

25%

printed ok in ABS