3D Printing: Recreating a Replacement Clamp Part

3D printing offers a practical solution for creating custom replacement parts for various items. This guide details the process of recreating a broken plastic clamp used for attaching an e-bike display to the handlebars.

The Problem: A Broken Clamp

The original clamp, made of less durable PVC plastic, fractured at a screw hole when an Allen screw was tightened. Attempts to repair it with PVC glue were unsuccessful, as the glued area broke again.

Temporary Solution

A temporary fix was fashioned using thick, transparent PVC foil. While it allowed the e-bike to be used, it was not a stable or aesthetically pleasing long-term solution, as the display could not be securely fastened.

The Replication Process

1. Technical Design

To recreate the clamp, a precise technical drawing was created using graphic software. A transparent typometer with a fine millimeter ruler was used to capture all dimensions accurately. The thin legs of the original clamp were reinforced during this stage to prevent future breakage.

2. 3D Modeling

The clamp was then constructed in 3D modeling software using the measurements from the technical drawing. The geometric simplicity of the clamp made this process straightforward. Challenges with accurately modeling the screw holes, which consist of two different-sized cylindrical sections for the screw head and thread, were overcome by consulting an online 3D construction user forum. Assistance from the community helped refine the design, particularly the boreholes.

3. Preparing for Printing

Subtle rounding was applied to the outer edges of the 3D model to avoid sharp edges. The final design was exported in the standard STL format, which is widely compatible with 3D printing services.

Ordering the 3D Print

A 3D printing service was contacted to produce the replacement clamp. Due to its small size, the service offered to include it as an additional item with another order, making the printing essentially free, with only shipping costs to be covered. The only compromise was the color; a gray plastic was available instead of the desired black.

Printing Method

The clamp was printed using the SLA (Stereolithography) process, which uses a laser to cure liquid resin layer by layer. This method is known for producing stable and fracture-resistant prints.

Finishing and Installation

Upon receiving the printed clamp, it was immediately installed on the e-bike handlebars. The fit was perfect, conforming well to the handlebar’s curve and accommodating the Allen screws precisely.

Customization: Color Enhancement

To match the original appearance, the gray 3D-printed clamp was colored using a black, waterproof Edding marker. Multiple coats were applied, effectively covering the entire piece, including corners and holes, to achieve a look nearly identical to the original.

Conclusion

The replicated clamp proved to be a robust and aesthetically pleasing replacement. The experience highlights the potential of 3D printing for creating custom parts, suggesting that reinforcing original designs can lead to more durable components.