Itty Bitty Double Extruder

[beerdart]

Spec sheet

http://ebay.3dpforu.com/drawings/34mm-stepper.png

How long are those NEMA 17 motors? I originally designed the block so 40mm long motors would clear the Z axis hardware.

What do they weigh?

[TechMasterJoe]

Spec sheet

http://ebay.3dpforu.com/drawings/34mm-stepper.png

200g is really good for that TQ and the length fits within the belts
maybe a Nema 17ver is called for clough42
and my i3v is on it's way
keep an eye on the build log for updates
this mod will be on the list very soon
i just ordered 2mm pitch acme for my printer i want to get z a little faster and lets face it 4000 steps per mm is over kill 1000 steps per mm is damn good
2mm acme +16micro is still 1600 steps and if you take that in to account with the limits of the ATmega chips at around 16,000-18,000 steps per second
16000/1600 net me a max safe speed of 10mm/s in the Z axis
16000/80 is 200mm/s X or Y
this number has some flex to it but just remember each output stacks so a 100mm/s in Y and 100mm/s in X stacks to 200mm/s
this is thanks to the single core mini pin head of a brain AVR based controllers have
i wish amtel had a plain atmega with a 80mhz clock so normal firmware worked with lite mods and not a full rewrite.
but hey that just a dream right lol