While news on the 3D-printed gun front has been sparse as of late, that's less a matter of stalled development than of the new technology already becoming old hat in this fast-moving world of ours. How else to explain the lack of coverage even as repeating pistols are knocked out on desktop equipment? Consider, for example, the Hexen pepperbox, which has stainless steel liners for its six barrels and is undergoing constant strengthening and improvement as discussed over in the DefCad forum. The video below shows the Hexen successfully fired (actually, it appears to be a related five-shot model), using 6mm Flobert (low-powered .22) ammunition.