Mapal’s 3D printed insert drill QTD for small diameters

Mapal offers 3D printed insert drill QTD, which are laser sintered drills from ø 9 to 12 mm, holders in 1.5xD, 3xD, 8xD and 12xD and indexable inserts type 1-4 for steel, stainless steel, cast iron and aluminium.

The QTD series insert drill had previously been available from 13 mm diameter. The normal central coolant supply system impairs more performance of the tool with smaller basic tool body and the central coolant supply weakens the core of the drill and makes it unstable. Also, the cooling ducts have to be made increasingly smaller. This results in a decreasing flow rate of the coolant to the cutting edge. Steel basic tool bodies with spiral cooling ducts that are common in solid carbide tools are not yet common in small diameters.


Laser sintering enables basic bodies in the diameter range from 9 to 12 mm with spiral cooling ducts to be produced by 3D printing. Compared with the central coolant supply with diversions, this design achieves a 100 % increased coolant flow rate.

The insert drill QTD for small diameter ranges has been registered for patent and is available as standard.