I"m no expert on this, but the article at https://en.wikipedia.org/wiki/Amorphous_metal may be relevant for you.
There are some special alloys, such as gold/silicon and various titanium-based ones, that become "bulk metal glasses" if cooled extremely quickly (for example, by sputtering onto a spinning cold surface). The speed of cooling prevents crystal formation. Early BMGs were quite strong but brittle; improvements have reduced brittleness and required cooling speed.
Plastic is used in 3D FDM/FFF printing partly because it had a wide temperature range for its glass state - where it can be flowed with some force, but won't flow due only to gravity.
Most metals have a very narrow, or non-existant, glass state. They transition from solid to liquid with almost no flowable-but-not-liquid state.
Are there any metals or alloys that display a glass transition state?