Round Corner Crack Top ((link)) - Sketchup

: SketchUp has a hard time creating faces smaller than ~1/16th of an inch (1.6mm). When you round a corner with many segments, the resulting triangles at the very top can be so small that SketchUp fails to fill them, leaving a "crack" or hole.

If RoundCorner keeps cracking your tops, the current modern alternative is (by ThomThom). It uses a different boolean engine that is often more robust at handling intersections without cracking, though the workflow is slightly different (you subtract shapes rather than selecting edges).

A standard face in SketchUp must be perfectly flat (planar). If your top surface is even slightly warped, skewed, or has hidden triangulated geometry, the rounding tool will lose its path and break the top surface apart.

Select the perimeter edges of the top face (the path).

Ensure the top face of your model is white (front face) and not blue/grey (reversed back face). Rounding plugins frequently miscalculate vectors on reversed faces, leading to torn meshes. To help you get this sorted out right away, let me know: sketchup round corner crack top

Do you have a specific model that keeps cracking? Drop your file parameters (units, radius size, segment count) in the comments below for a custom diagnosis.

Before you give up, try these solutions from simplest to most advanced.

If the top face is even slightly warped or not perfectly flat, the extension cannot cleanly connect the new rounded profile to the existing surface.

Ultimate Guide to Fixing SketchUp Round Corner Crack Top Issues : SketchUp has a hard time creating faces

In Fredo6 plugins, look for options relating to "Keep Corners" or "Grid Overlap." Toggling these can change how the plugin handles the transition between the vertical rounded edge and the flat top face. 3. Alternative Workflow: Native SketchUp Tools

plugin in SketchUp, it is usually due to the software's difficulty in creating tiny faces. SketchUcation Why Your Top Face is Cracking Tiny Face Limitation

If your top face isn't perfectly flat, the Round Corner tool will struggle to "heal" the surface, resulting in a fractured look. How can I fix the hole in this model - SketchUp Forums

In the Round Corner dialog, you have "Round" (smooth) and "Sharp" (flat miter). "Sharp" frequently creates the crack top. Use with a low segment count (3-4 segments) for tops. It uses a different boolean engine that is

Round Corner is a classic, but it is not the only option. Knowing the strengths and weaknesses of different tools allows you to choose the best one for the task.

to simulate rounded edges without actually changing your 3D geometry. Further Exploration official SketchUp Guide

If you are running into this issue, try these troubleshooting steps before giving up on the model: