Switching to injection molding for manufacturing frames may be beneficial for scaling up your production. Injection molding typically has lower per-unit costs and faster production rates compared to 3D printing, especially when producing large quantities. However, injection molding has higher initial costs due to the required molds and machinery.

When considering injection molding for your glasses frames, there are several design constraints to take into account compared to 3D printing:

1. Draft angles: To facilitate the removal of the part from the mold without damage, you will need to include draft angles in your design. The draft angles will slightly taper the walls of your frame to avoid any sticking or warping issues during demolding.

1. Wall thickness: Uniform wall thickness is crucial for injection molding to avoid issues like sink marks, warping, or incomplete filling of the mold. Make sure your frame design has consistent wall thickness throughout the part.

1. Undercuts: Injection molding can have difficulty with complex shapes or features that would prevent the part from being easily released from the mold. Try to minimize undercuts or utilize side-action cams, lifters, or collapsible cores to accommodate them.

1. Parting lines and gate locations: Consider where the mold will separate, and where the plastic material will enter the mold (gate location). Parting lines and gate locations can affect the appearance and strength of the finished part.

1. Material selection: Injection molding materials have different properties compared to 3D printing materials. Ensure the material you choose meets your requirements in terms of strength, flexibility, durability, and appearance.

1. Tolerances: Injection molding may produce parts with tighter tolerances than 3D printing, but it's essential to account for shrinkage during the cooling process. Properly designing your mold with shrinkage in mind will help maintain the desired tolerances.

It's essential to work with experienced injection mold designers and engineers to ensure a smooth transition from 3D printing to injection molding and to optimize your frame design for the injection molding process.
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