We're you using Virtual Foundry filament and sintering?
That's pretty much the only company I know of that sells high percentage metal filament.
I actually discussed working with them as many of they're offerings hadn't even been tested.
The printing I was referring to though is a number of different processes. Primarily SLS/Laser Powder Bed Fusion.
It's significantly different where the part is sintered (metal powder fused or melted) with a laser and doesn't require a post processing sintering.
Those machines have a considerable cost in the order of around 100,000$ But there are many companies that can produce parts from CAD files for relatively inexpensively.