Depending on how patient you are
View attachment 732209
this is my current iteration, fire button/board on the side opposed to 510 and bottle. I have back designs for both 75c and 250c, the 510 is designed for a varitube 30mm. I'm struggling a bit with getting print cost down (print all in one and separate the parts is my goal) and designing the battery compartment, might take a few months judging by my current speed of progress

Design might also change, I have 2 other designs in mind and am working on a 3rd. I'll release it to the public for free though once it's done.