On the potential use of two-photon polymerization to 3D print chromatographic packed bed supports

•Chromatographic supports with sub-micron through-pores could be printed.•3D printing also displays local heterogeneities at the smallest scales.•The effect of this remaining heterogeneity is estimated.•Printing times are shown to be excessively long.•Other impediments for practical use of 3D printed packings are discussed.