reprap 3d-printer without ramps

Hello guys, i'm new to the forum. I have a project to my university and we have to build a 3d-bioprinter , the fact is that printer isn't working with heater , it only extrudes a chemical so we don't need heater and stuff like that. The point is that due to some reason we don't have a ramps or another electronic board , we have only an arduino mega , easy drivers and stepper motors . Is there a way that we can make it work?? all the firmwares i found are based to an electronic board like ramps ,sanguinololu, gen7 etc ... please heeelp!!!

Ramps is just a break out board that puts the standard parts on known IO pins

If you not usings a RAMPS, you will have to create you own board definition and assign all the required pins to the actula pins you have the cparts onnected to.

Eg use marlin add your wireing to pins.h

And which board should i select from the board.h??

you need to create a new board definition to match you hardware.

You can't not use a ramp and expect to be able to use the ramps or any other board definition, unless you put all the steppers, endstops, etc on the same pins.