Note that for a peristaltic pump, you can construct one yourself without needing to worry about the fluid-tightness of the parts you construct, because the fluid is always within the sealed compressible piping you've bought. So 3d printing or other DIY methods are pretty feasible, for a peristaltic pump you don't need to worry about prints not being perfectly fluid-tight. Provided you've got piping adapters made of some material which is leak proof and seals well, you could always try paralleling up a bunch of separate pumps, each with too little flow rate individually, but enough when summed and some accounting made for possible inefficiencies.