It would cost free if you can find everything yourself and build it without a 15 dollar book they are selling. Im not making raw biodiesel Im making a 1 micron above standard astm fuel.
50 gallons of methanol is $3.81/ gallon for private quantities
55 gallon barrel is $15
50.12 bag of Koh here is 87 cents or so a lb.
45lb Magnesol and a huge pre cleaning sock filter is $129.00 with shipping
1 and 5 micron sock filters from McMaster-carr is 28.02 with shipping
Pvc from Home depo and fittings and glue and valves about 50 bucks plus
My pumps free, my totes, free, my dads help priceless.
Ive got approx 400 ish buck involved and I havent spent a nickle on plans just picking others brains.