Hump Jumper 3 & 4mm (Jean-a-ma-jig)

🧵 The Ultimate Sewing Lifesaver for Thick Seams & Denim

This 3D-printed Hump Jumper (also known as a Jean-a-ma-jig) is the ultimate, easy-to-print tool that keeps your presser foot perfectly leveled when riding over "humps," bumps, and multi-layered fabrics. It’s an absolute game-changer, especially for heavy fabrics like denim, canvas, or fleece.

To make sure this tool fits your specific sewing needs, I have included two different thickness options in the files:

• 3mm Version: The sweet spot for standard denim hems, medium-thick seams, and most everyday sewing projects.
• 4mm Version: Extra height for heavy-duty fabrics, multi-layered winter coats, or exceptionally thick bumps.

📺 New to this tool?

To be honest, I didn't even know this tool existed until my mother asked me to print one for her! If you are like me and want to see exactly how it works, check out this quick video tutorial: The Hump Jumper. How to handle humps, bumps and different layer thicknesses in your sewing - YouTube

⚙️ Recommended Print Settings

• Material: Any (PLA, PETG, …). Great for using up those leftover filament scraps!
• Layer Height: 0.2mm
• Infill: 15% - 20%