Perhaps you may want to look into Perfluoroalkoxy alkane (PFA) or more likely Fluorinated ethylene propylene (FEP) (brandnames: Teflon FEP, Neoflon FEP, Daikin/Dyneon FEP) which have lower melting temperatures (particularly FEP with a melting temperature of 260C for the purpose of melting and injection molding. I don’t know if this topic has been discussed (anywhere) or if anyone has tried it. One may want to do some additional research prior to using it, especially if it’s to be used with biological organisms. If you are to believe the information on Wikipedia it seems that it could work, in theory.
Searching for these materials results in products not suitable for 3D printing (i.e., sheets, tubes, rods at McMaster-Carr and US Plastics), unless you can extrude the filament yourself. However a Google search of “1.75mm FEP” may be promising.
I do see some results for printing with such types of plastics on the RepRap wiki and some other possible sites. Some have been looking into alternative plastics as well (such as PVDF) for certain characteristics, so depending on the application you can perhaps try an alternative plastic.