An injection molding system comprising: at least one multi-cavity injection mold insert made of a metal having a thermal conductivity of more than 30 BTU/HR FT °F (51.9 W/m °C), and being free of cooling channels; wherein the molding system further comprises: a first injection system operable to deliver molten material at a substantially constant pressure of between about 6.89 megapascals (1,000 psi) and about 103.42 megapascals (15,000 psi) to a set of mold cavities of the at least one multi-cavity injection mold insert when in fluid communication therewith; a second injection system (12, 1262) operable to deliver molten material at a substantially constant pressure of between about 6.89 megapascals (1,000 psi) and about 103.42 megapascals (15,000 psi) to the set of mold cavities of the at least one multi-cavity injection mold insert when in fluid communication therewith; and a variable-position section to which the multi-cavity injection mold insert is secured, the variable -position section operable to position the set of mold cavities of the at least one multi-cavity injection mold insert into fluid communication with the first injection system when in a first orientation and to position the set of the at least one multi-cavity injection mold insert into fluid communication with the second injection system when in a second orientation. at least one multi-cavity injection mold insert made of a metal having a thermal conductivity of more than 30 BTU/HR FT °F (51.9 W/m °C), and being free of cooling channels; wherein the molding system further comprises: a first injection system operable to deliver molten material at a substantially constant pressure of between about 6.89 megapascals (1,000 psi) and about 103.42 megapascals (15,000 psi) to a set of mold cavities of the at least one multi-cavity injection mold insert when in fluid communication therewith; a second injection system (12, 1262) operable to deliver molten material at a substantially constant pressure of between about 6.89 megapascals (1,000 psi) and about 103.42 megapascals (15,000 psi) to the set of mold cavities of the at least one multi-cavity injection mold insert when in fluid communication therewith; and a variable-position section to which the multi-cavity injection mold insert is secured, the variable -position section operable to position the set of mold cavities of the at least one multi-cavity injection mold insert into fluid communication with the first injection system when in a first orientation and to position the set of the at least one multi-cavity injection mold insert into fluid communication with the second injection system when in a second orientation. a first injection system operable to deliver molten material at a substantially constant pressure of between about 6.89 megapascals (1,000 psi) and about 103.42 megapascals (15,000 psi) to a set of mold cavities of the at least one multi-cavity injection mold insert when in fluid communication therewith; a second injection system (12, 1262) operable to deliver molten material at a substantially constant pressure of between about 6.89 megapascals (1,000 psi) and about 103.42 megapascals (15,000 psi) to the set of mold cavities of the at least one multi-cavity injection mold insert when in fluid communication therewith; and a variable-position section to which the multi-cavity injection mold insert is secured, the variable -position section operable to position the set of mold cavities of the at least one multi-cavity injection mold insert into fluid communication with the first injection system when in a first orientation and to position the set of the at least one multi-cavity injection mold insert into fluid communication with the second injection system when in a second orientation.