Another interesting way to fabricate microfluidic features is via the use of dry films, which were originally developed for printed circuit boards . This technique is usually compared with photolithography -used for fabrication of SU-8 layers, or soft lithography, which is used to prepare molds for casting polymers such as PDMS. While photolithography is an expensive method that needs cleanroom facilities and expert technicians, the fabrication of microchannels via dry films is a simple cleanroom-free approach which can provide comparable resolution and precision to SU-8 photolithography. Dry films resists (DFR) in different series such as Ordyl, SUEX, and ADEX, TMMF S, as well as SU-8 based DFR are commercially available in different thicknesses. DFRs can be laminated on a variety of different thermoplastic substrates or other types of materials via a simple office laminator. Subsequently, the layer is exposed to UV light through a photomask with the desired features and baked on a hotplate for a short period of time.