On Tue, May 30, 2017 at 10:05 PM, David Niklas <[email protected]> wrote:
> Remember that as the weight and speed of the hot end increases the load > on the z-axis motors and gears also increases (if temporarily), leading to > (temporary), inaccuracies when using multi motor setups. but you don't print at the time when z-axis motors are in motion: they're there purely to move the bed up (or down) for the next layer. thus the important thing to have for z-axes is precision and fine tolerances. fine tolerances can be achieved on lead screws with double nuts and a spring to prevent backlash. ok so on to the next issue: > If I were to use multiple motors I'd not do it like this: > M == motor > H == Hot end > > TOP SIDE > M----M +-----+ > | | |H | > |H | -> | | > M----M M-----M > > But rather like this: > > > TOP SIDE > +----+ M----+ > | | H | > | | -> | | > M----+ M----+ > > Assuming I understand you rightly. so you're advocating 3 lead screws instead of 4 i considered this as well, however i realised that if the printbed has even the slightest amount of twist it becomes impossible to correct that: you literally have to throw out whatever metal plate is being used and replace it. if you have 4 lead screws, they may be used to place a twist on the plate to return it to dead-flat. l. _______________________________________________ arm-netbook mailing list [email protected] http://lists.phcomp.co.uk/mailman/listinfo/arm-netbook Send large attachments to [email protected]
