This is a threaded adapter for 1.6325inch to 3.4160inch diameter ducting for my YOOPAI (https://www.amazon.com/dp/B0DSKDXSL5?ref_=ppx_hzsearch_conn_dt_b_fed_asin_title_1&th=1) Resin printer enclosure exhaust to KQZ-B1 (https://www.amazon.com/dp/B0DT1MN24T?ref=ppx_yo2ov_dt_b_fed_asin_title&th=1) solder fume extractor to keep the fumes down.

Printed on K2 Plus with:
PLA
Infill: 15%
Supports: No
Pattern: Gyroid
Brim: Inner and Outer
Orientation: Larger side down