Same .gcode file - two different printers - very different results
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Z is screw driven .. no, there was no microsteppting on the Z under Ramps.. but there was some changes to the stepping for the extruder..
This is from the titan docs:
"
Usage
Firmware Calibration
Because Titan uses a known gearing ratio and a consistently machined drive gear, we can offer a fairly accurate steps / mm set-point. Forgot about that ..Steps per Unit (Extruder) = Motor Steps * Micro-stepping * Gear Ratio / (Hobb Diameter * Pi)
Standard motor steps / rev = 400 for the new style motor or 200 for the old style motor (Refer to assembly steps if unsure which motor you have).
Standard micro-stepping = 16x
Gear Ratio = 3
Hobb Diameter (Effective) = 7.3
200 * 16 * 3 / (7.3 * 3.142) = 418.5
400 * 16 * 3 / (7.3 * 3.142) = 837 "I changed that number under ramps .. Is there something similar under the RepRap configs?
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There is this command in the config:
M92 E420:420 ; Set extruder steps per mm
looks like this has to change. but is this causing the problem ..
will update it to:
M92 E840:840 ; Set extruder steps per mm
does this seem reasonable?
Why not, giving it a try ..
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No that will not affect your Z AXis hight at all?
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Probably not, but sounds like it needs to be done anyway??
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Looks like no difference .. when done printing will try to measure the "jog" on the Z axis ..
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What is the thread pitch on your Z axis screw? is there any gearing between the Z axis motor and the screw?
Alternatively, do you know what Z steps/mm you were using in the firmware for the other board?
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Tried a jog of +100 and measured 65 mm change.. Will repeat .. Pretty much same result ..
Could this be a current problem to the Z steppers (2) -
Looking to find your answers .. Have to find the old marlin code .. and of course it is not on this computer .. will be back when I have the answers .. I believe the P3 came with M5x295 screw rods if that helps ..
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It could be that your Z steps/mm are wrong, or your X acceleration is too high, or your Z maximum speed is too high, or the Z motor current is too low. You should be able to get all of these details except the motor current from your Marlin config file.
One other possibility: if you have two Z motors and they are badly-chosen high inductance low current types, then the series connection used by the two Z motors connectors on the Duet won't work well with them, and you will need to connect them in parallel instead. Can you read the model number of the Z motors from the label?
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Some numbers :
Steppers SL42STH40-1684A
MARLIN:
DefaultAxisStepsPerUnit 80,80,4000, 775 – the 4000 looks bigger than the config val
Default Acceleration 3000
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Yup z Steps are set to 2560 .. try a change to 4000?
Ratios look about right for measurements ..
warmin up for a test print .. -
If you got a 65mm change when commanding 100, then 4000 will get you close.
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BTW, your pictures in this post and another you posted in, are not working.
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It is printing .. hopeful .. damn, you guys are good ..
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Glad you sorted it. Those steppers are good for plugging directly into the 2 Z motor sockets on the Duet. 1000mA current in the M906 command would be about right.
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Print looks much better .. still not perfect but closer, do a few more calcs and adjusts.. will up the current to 1000 in M906 and increase the extruder steps for the titan and the 0.9 motor .and keep trying . Thanks again all ..
