Add July 2026 meetup announcement and update challenges for July Scarf Seams challenge

announcements/July2026.md

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+# 3D Fuel July Meetup - Meeting Announcement
+
+## Email Subject Line
+
+Join Us July 15th: 3D Printing Meetup + Scarf Seams Challenge!
+
+---
+
+## Email Body
+
+Hey everyone!
+
+**IMPORTANT LOCATION NOTE**: Our July meetup will continue to be held at the **West Fargo Public Library** (215 Third St. E., West Fargo, ND 58078).
+
+Join us July 15th for the **July 3D Printing Meetup**.
+
+For more information about the meetup and community events, visit [www.fargo3d.com](https://www.fargo3d.com)
+
+**Time: 6:00 - 8:00 PM**
+**Location**: West Fargo Public Library, 215 Third St. E., West Fargo, ND 58078
+
+Come join us to catch the latest industry news updates from John.
+
+### July Challenge: Scarf Seams
+
+This month's challenge is all about mastering **scarf seam placement and settings**! We want to help everyone dial in their scarf seam technique.
+
+**Challenge Requirements:**
+- Create a 3D printed object with a scarf seam placed on a sphere
+- Maximum size: 75mm cubed
+- You can use the bottom half square approach if desired
+- **Bring your settings!** Come prepared to discuss your temperature, speed, and other settings that help you achieve clean scarf seams
+
+This is a great opportunity to learn from others in the community and refine your own scarf seam technique.
+
+See you there!