grip_tip.md

Fingertips for Better Grip

We've added a small but useful feature to the fingertip design in the Onshape model, making it easier to improve grip performance.

Flat Tip Design for Adhesive Grip Layers

The tip of the finger can be flattened, allowing you to:

• Cut the same shape from the adhesive or anti-slip material of your choice
• Stick it onto the fingertip
• Fold the side flaps neatly around the edges

To secure the folded flaps in place, you can add a thin strip of tape or band around the perimeter of the tip. This helps maintain a clean and durable finish.

Best Performing Material So Far: 3M GM400

After testing various grip-enhancing materials, our favorite so far is the 3M GM400

• Strong dry adhesion (not sticky, but highly grippy)
• Excellent friction, even on smooth objects
• Durable and wear-resistant, sticks well
• Easy to cut and apply

However, the cost is quite high and the quantity is probably too much for just covering one gripper tip...

⚠️ Note: We have no affiliation with 3M — this is an objective recommendation based on hands-on testing.

TPU Option – Deformable but Solid

You can also 3D print the fingertips in TPU with a moderate infill (30–50%), resulting in:

• A flexible structure that adapts to object shapes
• Enough rigidity to preserve form and control

Combining TPU with an adhesive grip layer offers a great balance between compliance and friction.

Personal Preference: Rigid Base + Grip Layer

While TPU works well, our personal preference is to use a rigid tip (PLA or PETG) and simply add a thin rubber-like or anti-slip layer (such as GM400) on top.
This approach avoids unwanted deformation, while still ensuring strong and reliable grip — especially useful when precise, repeatable grasps are needed.

Feel free to experiment with different grip materials — the flat tip shape makes it easy to try out and swap alternatives depending on your use case or your budget.