Tired of generic bag straps? This modular 3D-printed heart strap adds a playful, customisable twist to your handbag or shoulder bag. Designed for both durability and style, the interlocking heart shapes gradually increase in size until they meet in the middle. After 1.5 years of daily use, only a few smaller modules gave out (and they were poorly printed), so if you want extra strength, scale the modules non-uniformly—adding ~0.4mm in the Z-axis can reinforce them! Assembly: 🧩 (plug & play) | 19g of filament | 2h 17min (on my printer :)

Fit & Customisation

• Standard length: 61cm.
• Need a different size? Duplicate or remove heart modules to adjust the length.
• Prefer extra durability? Scale the modules slightly in the Z-axis for added strength.
• Want a fun finish? Print on sublimation paper or a holographic build plate for a colour or metallic effect.

Printing Details & Assembly 📐 Required Build volume: 200x200cm

• One of my favourite filament are the transparent colours from Esun (95A TPU)
• Higher infill density = stronger design. I recommend 100% line or concentric infill.
• Print without support | Flat orientation.
• STL file format. Assembly Tip: If you want to swap the strap out often, start weaving the smallest module onto a clasp rather than attaching it directly to the bag hook. Otherwise, to remove it, you’ll need to disassemble the strap from the middle out. If doing this, grab a set of 15mm clasps (the strap itself is ~10mm, so a smaller clasp fits but leaving some extra space helps with movement).

How to Style It This strap isn’t just functional—it’s a statement piece! Attach it to your favourite handbag, crossbody, or even a tote for an instantly unique, modular look.

Sustainability & Modular Design Like all my designs, this strap is built for repair and adaptability—swap out individual modules instead of replacing the whole strap.

I’d love to see your prints! Tag me @variableseams or send photos—I can’t wait to see your colour choices and styling ideas.

FTC Disclaimer & Reminder: Some links in this description may be affiliate links. If you purchase a product or service through these links, I may receive a small commission at no extra cost to you!