To get max microstepping I believe you should set all three microstepping pins high. That is the normal behaviour for most stepper drivers if I am not mistaken.
I have a 3DR with Sanguinololu electronics set to x16 microsteps and a J-head hotend.
My DEFAULT_AXIS_STEPS_PER_UNIT are set to (55.5, 55.5, 55.5, 560), a figure I arrived at by repeated calibration. Not sure why the E figure is so different to RichRap’s but it works for me. I always print on glass with a light PVA wash and the heated bed set to 55°C.
One more thing - there seems to be some confusion about fans. The video clearly shows that the fan is aimed up at the PEEK cooling fins, as it should be, not down onto the bed. Cooling the cold end of a J-head is vital. The fan needs to be on all the time to prevent filament jams. Thermally insulating the hot end can help to prevent the heat convection that causes jams, as +nop head has clearly demonstrated on his blog.
Whelp, THIS: https://drive.google.com/file/d/0B09sUvvteXCBYWRfSUNQb0lRLVE/edit?usp=sharing sure doesn’t look like this: http://4.bp.blogspot.com/-fA1ryGebWxQ/Updc0VTGWgI/AAAAAAAADts/0UaxmEzN4b8/s1600/Untitled.jpg
But at least it’s laying down and staying in place. Looks like I need to slightly shim one side and raise Z a tenth or so…then look at the next steps.
@Richard_Gain this was with X32 and {111, 111, 111, 166} and Slic3r set REAL slow. (and the discovery of a naming convention so that I could easily remember the settings in slic3r)
Glad you are getting there. I mistook the fan orientation and hence gave some bad advice. Press on !
If your nozzle is 0.1mm off the bed when hot and you ask for a 0.15mm thick first layer, wouldn’t the nozzle be 0.25mm from the bed while extruding? I thought the idea with measuring a paper thickness between nozzle and bed was to allow for thermal expansion to zero out the gap.
Just a followup: I ‘discovered’ (or rather realized) that the wiring for the motors was interfereing with the movement of the carriages up near the stops, which could negatively impact calibration. I disassembled enough to re-feed the wiring correctly and have one or two niggling bugs as a result. I’ll open a new thread when it’s all back up and running and see if things are a little more reproduceable at that point.