INSERTS
Who installs threaded brass inserts in 3D printed parts?
Gramm GmbH installs heat-set knurled brass threaded inserts into FDM parts as part of its contract manufacturing service in Deggendorf, Lower Bavaria. A pilot hole is printed into the part, the insert is heated with a heated tip and pressed into the hole, and the plastic re-solidifies to lock it in place. The result is a durable metal thread that accepts standard metric screws and bolts and survives repeated assembly and disassembly. Insert installation, post-processing and assembly are available with any manufacturing order, including repeat orders.
WATCH HOW IT WORKS
Heat-set insertion, visualized
A heated tip melts the insert's knurled brass body into a printed mounting hole, as the brass cools, it locks permanently into the surrounding plastic.
THE PROCESS
From printed hole to permanent thread
Pilot hole printed
The part is printed with a pre-sized mounting boss and pilot hole, slightly smaller than the insert's outer diameter.
Insert heated
A heated tip, sized to match the insert, brings the brass insert to installation temperature.
Pressed into the hole
The hot insert is pressed straight down into the pilot hole. The heat melts the surrounding plastic just enough for the insert's knurled exterior to sink in.
Cooled & locked
As the plastic cools and re-solidifies around the knurled brass body, the insert is mechanically locked in place, leaving a durable, reusable metal thread.
WHY BRASS INSERTS
Threads that survive real use
Reusable
Withstands repeated assembly and disassembly without stripping, unlike threads cut directly into printed plastic.
Stronger Joint
The knurled exterior locks mechanically into the plastic, holding far more torque and pull-out force than a plastic thread alone.
Standard Hardware
Compatible with standard metric screws and bolts, no special fasteners required for assembly or service.