largest reflector+optics i can get my hands on for a custom flashlight.

ive got a 3d printer, some fans, and few heatsinks and a xml2. i wanna make the throwiest beam possible no matter footprint or size. i would like to keep cost as low as possible though

What is your budget?
Also are you doing this as a hobby or do you want/need this flashlight for something in particular?

If you have the money and need it for something very far away a LEP is your best bet. If you need it for something but can do with less there are lights like the Nitecore P30x and alternatives that can give you up to a kilometer and if its for a hobby or you must have lower cost then i’m sure others will have interesting suggestions for you.

this is as a hobby, i would rather avoid a host and just build a full diy flashlight. i may try a Fresnel lense since those have gotten much cheaper with the rise of VR