Most 3D printers come with a pretty basic filament holder — often little more than a bar to hang the spool on. [Ivan Miranda]’s 3D printers run bigger spools than most, though, so he had to ...

One important refinement of the sliding filament theory involved the particular ... in the way of your hand as it tried to hold the actin rope. For myosin to bind actin, tropomyosin must rotate ...