Additive manufacturing processes and manufactured article

A manufactured article, comprising:

• three or more glass layers laminated together with each glass layer being at least partially overlapped with another glass layer and without any binder material in between the glass layers, each glass layer having a thickness in a range from 1 μm to 500 μm, at least one of the glass layers being composed of silica or doped silica;
• and
• at least one feature formed in at least one of the glass layers, the at least one feature being a through-hole, a partial-depth hole, a channel, a slot, a void, an engraved mark, or a differentiated area in the at least one of the glass layers,
• wherein at least one of the glass layers is a porous glass having a density in a range of from 0.4 g/cm3 to 2.2 g/cm3.

A manufactured article, comprising:

• three or more glass layers laminated together with each glass layer being at least partially overlapped with another glass layer and without any binder material in between the glass layers, each glass layer having a thickness in a range from 1 μm to 500 μm, at least one of the glass layers being composed of silica or doped silica;
• and
• at least one feature formed in at least one of the glass layers, the at least one feature being a through-hole, a partial-depth hole, a channel, a slot, a void, an engraved mark, or a differentiated area in the at least one of the glass layers,
• wherein at least two of the glass layers have different compositions,
• wherein the at least one feature comprises a first feature configured as an open channel formed in at least one of the glass layers, and
• wherein the at least one feature comprises a second feature configured as a differentiated area in a first portion of at least one of the glass layers, the differentiated area having at least one material property that is different compared to a remaining portion of the at least one glass layer.