planetary roller screw Jack
thingiverse
this is a screw jack that uses 1/2-13 all thread rod and a simplified planetary roller screw.It is 64 turns per inch so lots of power. I haven't tested it to failure so I am not sure how strong. print the roller 5 times. and clock the top to the rollers on the bottom gear, find the tallest and the shortest and rotate the top to for the rollers. it uses 1 roller skate bearing on the small gear and some .177" bb gun bee bees on the bottom between the base and the large gear, just fill up the groove.
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