Modification of component portion models for joining of component portions

A molded fiber tool comprising:

• a first portion of a component of the molded fiber tool, the first portion including a first attachment edge;
• a first rib extending along a segment of the first attachment edge, the first rib including holes;
• a second portion of the component, the second portion including a second attachment edge;
• and
• a second rib extending along a segment of the second attachment edge, the second rib having protrusions, wherein the second portion is to be joined with the first portion through insertion of the protrusions in the second rib into the holes in the first rib.

A three-dimensional (3D) fabrication system comprising:

• a build volume;
• fabrication components;
• and
• a controller to:
• receive a first 3D model of a first portion of a screen of a molded fiber tool, the first 3D model including a first digital rib along a segment of the first 3D model, the first digital rib including sockets;
• receive a second 3D model of a second portion of the screen, the second 3D model including a second digital rib including protrusions;
• control the fabrication components to fabricate the first portion of the screen with a first rib corresponding to the first digital rib;
• and
• control the fabrication components to fabricate the second portion of the screen with a second rib corresponding to the second digital rib, wherein the protrusions in the second rib are to be inserted into the sockets in the first rib to join the first portion and the second portion together to form the screen.