Wilton Icing Piping - Coupler

Here's a request from my sister... a replacement coupler for an icing decorating tool.

This is the screw on part that clamps your selected icing tip onto the purple lid for the Wilton Dessert Decorator. According to the kit's image (included in the listing), this would be the larger of the two couplers.

As my other experiences of kitchen items and 3D printing goes... I'd advise a solid print. Let's not give water empty holes to fill. Hand washing should be fine, but the heat and prolong