This response is based on the information provided.  We suggest you discuss with your contracting team, program manager and/or legal department as appropriate. 

This is not a FAR/DFARS question.  A unit makes a make/buy decision as part of its initial acquisition strategy.  If it determines through market research that industry cannot adequately meet government needs, whether for capability, time, or cost reasons, it is not precluded from manufacturing the item(s) organically.  We offer that organic production is preferred and reasons for outside sourcing are lack of skills/knowledge, manpower, time, or costlier to produce in-house.

When producing in-house, you need to consider the full life-cycle of the item.  If DLA or a requiring unit has 3-D capabilities, we see nothing  preventing producing items, that is what the 3-D printers are for.