Combine 2E1Y version v1 (2E1Yv1)

1. Purpose

Joins a distant branch into the main as a 2-elbow + 1-Y-branch assembly using the version-1 algorithm. Use it when the standard 2E1Y fails — each version suits a different run geometry.

2. Quick video (≤ 2 minutes)

[Video in production — follow the steps below for now.]

3. Steps

1. Open a 3D view showing both the main and the branch to join. [image 01: main and branch before joining]
2. Click 2E1Yv1 inside the Gom pulldown in the VP_MEP tab, Plumbing panel.
3. When asked to pick the main pipe, click it. [image 02: picking the main pipe]
4. When asked to pick the branch pipe, click it. The tool builds the 2-elbow + Y-branch assembly with the version-1 algorithm. [image 03: the finished version-v1 assembly]

4. Real-world example

A DN75 branch meets the stack at a skew angle, and the standard build twists an elbow. Switching to 2E1Yv1 — the version-1 algorithm handles exactly this skew, and the elbows land snug with no manual fix.

5. Common errors

Symptom	Fix
Esc mid-way loses everything	The command works as a pick pair — restart from the main-pipe pick
Version v1 fails too	Switch to the standard build or version v2
The elbow assembly twists wrong	The branch pick was too close to an old elbow — pick mid-run, then rerun

6. See also

• Combine 2 elbows 1 Y-branch — the standard build; try it first.
• Combine 2E1Y version v2 — a third algorithm for tough runs.