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Homebrew engraver to 3D printer Mod

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picclock:
Hi Bill

Thermistor measurement is done with a lookup table. It specifies resistance and temperatures at a number of points. Between the table points the graph is assumed linear and the lookup result interpolated. Reprap wiki details this and loads of other stuff.

Try http://reprap.org/wiki/Thermistor

One of the nice things about the whole reprap thing is the freely exchanged information.

FWIW I'm not sure speed in the Z axis is terribly important. Often it may be necessary to wait between layers if making a small item to allow the plastic to harden. Small precise steps are the key here.

Best Regards

picclock

BillTodd:
Thanks PC,

I've just been designing an extruder.  dual with single motor and auto lift , no idea if it'll work but should be a laugh :-)

BillTodd:
Extruders get complicated fast !

BillTodd:
Quick update:

My dual extruder design will not work - had not realised the extruder motor reverses in use  :Doh:
I may as well  just buy an extruder :-(

I have configured and mounted an arduino / ramps board and have the X & Y moving and homing nicely . PSU and Z have stil to be sorted.

BillTodd:
ATX supply screwed onto the back of the unit.  BUT...


ATM I have the PS_ON# &  5Vsb going to the PS_ON and 5V  on the ramps board , so the arduino is not powered until I manual enable PS_ON (short it to gnd) . 

Should I link 5V and VCC on the power-control connector to power Marlin when switched on ? (and have PS_DEFAULT_OFF defined in Config.h)  - I am a little concerned at the plethora of 5V rails being shorted together.

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