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This is a working model of a floor jack. It goes from 50mm to 175mm with a few pumps of the handle. It can only lift a few pounds, so it's not meant for actually jacking anything. I printed it pretty heavy at 50% infill for stability. About 50 hours and 800 grams of filament. I included the pins as printable objects, but I used 1/4" aluminum rod instead. The print also requires forty two (42) No. 4, 3/8" button head screws and two (2) 1/4-20 x 4" long bolts. You'll have to grind a little bit off the end of the bolts for a nicer look.