Even if foreign piston converters like the one from Rotring fit mechanically into the StarWalker, their use should be avoided. Montblanc has deliberately excluded the use of converters on this model, because ink residues that remain when dipping into the ink bottle in the resin grip section cannot be completely removed. The consequence are inevitably contaminations in the cap and on the fingers. Cartridges are therefore on the StarWalker the only sensible filling method.