I am new in microfluidics and trying to fabricate my own chip to facilitate my PhD thesis. But the fact is, I am facing some difficulties to clearly understand about the photoresist. That's why seeking for experts suggestion. Thanks in advance!
A SU8 photoresist is very common used in the fabrications of microfluidic chips and MEMs for micro 3D patterning due to its excellent coating, planarization and processing properties as well as its mechanical and chemical stability.
The following link gives your some idea about which type of SU8 you should use.
https://kayakuam.com/products/su-8-photoresists/
You could find a lot of papers regarding the processing details.
As Xuhua said, SU-8 is a common photoresist for microfluidics: https://www.elveflow.com/microfluidic-reviews/soft-lithography-microfabrication/su-8-mold-lithography/ .
You may also use solid photoresist like Ordyl (easier to process but less precise.