@jay_s_uk : ok got it. you can mark this thread as Solved.
Thank you again!
Best posts made by JayT
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RE: Configure dual extruder via expansion board
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RE: Configure dual extruder via expansion board
I have attached the config file.
NOTE:- IF I run M115 B40 or M115 B41, I get positive response. both communicate well & the LEDs blinking is in sync. Same 3.4 beta3 on all boards.
- Also I noticed, if I configure single board with B40 address and run the second extruder it works. So this confirms no problem with second motor or the board. Something in config is weird?
- I haven't used G4 commands.
NOTE: config is too raw, just for trial purpose. main purpose is to try running dual extruder via exp- 1XDs. - B40 (no jumpers), B41-XD : jumper on CAN-FD-OUT.
Mainboard to B40 in -> B40 out -> B41-in-> Jumper on the B41-out. - I tried removing all jumpers too to see just in case it works.
(not able to upload file , so pasted images of the config).
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RE: Simulated time turns N/A before print ends
@JayT
@dc42 : After few trials, we confirmed that since timer (job duration & the decrementing simulation time) starts immediately after pressing Print. Here if the bed & extruder temperatures are not attended yet, the warmup duration accounts only for bed heater time to attain target temperature. Extruder time to attain temperature is not accounted.
Hence we reach to condition (t<0) and simulated time completes displays N/A, while print is still running for few minutes.2 methods to resolve this:
- We account extruder temperature also in warm up duration
- we start simulated time once Print actually starts (after warm up of bed & extruder)
What do you suggest ?
Do we evaluate time to attain extruder target temperature? Can you direct us to the code to change? -
RE: Gap in printing concentric circles-(CW side)
@modl :
Seam is not the issue. If we change this, it does not reduce gap.
Backlash does though. But even then I see the flatness at the top & bottom surfaces of the circle.I also observed very less similar flatness in left & right most sides of the circle. Is this due to some slippage?
Latest posts made by JayT
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RE: How to set M425 backlash compensation?
@o_lampe :
Right. In that case you can resolve this thread.
Thanks. -
RE: Gap in printing concentric circles-(CW side)
Re-alignment & belt tightening & ensuring perpendicularity of XY is something I re-checked again. The problem greatly resolved afterwards by using backlash compensation M425 with S factor lower than 10.
@o_lampe
@DIY-O-Sphere
Couple of questions:- Is there any way I can verify the linear bearings quality as per your suggestion?
- How do we set exactly same tension in X & Y axis belt. Is there any procedure or method ? Because the moment this tension changes, it will affect the learned backlash value
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RE: How to set M425 backlash compensation?
Before I proceed to measure steps/mm correction, Can you tell me in general how much the is the diameter variation in itself of a CIRCLE print of good quality ?
As in if the variation of circle is within 100-200um (somewhere diameter being 60, somewhere 59.9/59.8), then is it normal in belt system & guide rod systems? -
RE: How to set M425 backlash compensation?
Can you help in changing subject : correct the typo in spelling of Backlash in thread subject? (i.e. remove that extra 'l' for easy search appearance"
Thanks.
@sebkritikel : I have gone through the suggestions and will try that print for backlash.
One more question:
-e) Can steps/mm be also updated in addition to setting backlash.
I understand on direction change backlash will act to include few pulses to compensate for loss of move. However, steps/mm will also add up some pulse to stepper, to print the exact dimension.
The reason I ask is, the diameter of circle I print now has variance in diameter, when measured in Y direction as compared to Xdirection. & variance is 300-350um. So diameter in vertical direction is say 60mm then in X direction is say 59.7mm . Is this variance acceptable in fdm printing?So should I measure steps/mm & set them ?
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RE: How to set M425 backlash compensation?
Thank you for clarity.
When I try the way you mentioned, gaps in prints have reduced. Specifically circles. But I had to use value "1" in S factor. With default S10, on printing circles, they went too straight. vertical & horizontal sides.
- this also reduced some gaps in printing other objects, specifically during infills.
I have couple of questions:
a) Are there any sideeffects of using this backlash option? How to check those?
(I tried printing XY calibration cube, it came out fine in dimensions.)b) Actual backlash for X axis that I measure is around 200 um using dial guage. But a value of 250 helped me to fix the problem in X direction. Any method to measure this quick or its trial & error based?
c) X & Y backlash value being different, can cause any defects in print shapes ?
d) Can I use value of 0.1 or 0.5 for S factor or minimum is 1? Because what I understood is the lower S value, the quicker it compensates backlash & shape distortion is least. So points where X & Y change their direction during print, can be smoother these extra steps are applied in the smallest distance possible, ofcourse without overloading stepperdriver too much.
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RE: How to set M425 backlash compensation?
@sebkritikel : Ok understood. So If I increase the S value to say S50, the defect of gap will not get fixed, as backlash shall be compensated at a longer distance than needed. Right?
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RE: Gap in printing concentric circles-(CW side)
@soare0 : I tried. The major deformations that I see are along Y direction & X direction, just when either X or Y axis is changing its direction of movement while drawing a circle. Gaps reduce with backlash set. However, I see circle little flat on those points, instead of proper arc . - thats the major problem.
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RE: Gap in printing concentric circles-(CW side)
@modl :
Seam is not the issue. If we change this, it does not reduce gap.
Backlash does though. But even then I see the flatness at the top & bottom surfaces of the circle.I also observed very less similar flatness in left & right most sides of the circle. Is this due to some slippage?
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RE: How to set M425 backlash compensation?
@o_lampe : If we want to avoid using backlash, how to solve this problem ?
When I used backlash value with default S factor, gaps in the circle reduced & shapes got better.
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RE: How to set M425 backlash compensation?
Can you confirm my understanding from this explanation?
If backlash is of 0.180, with default multiplier of 10, steps would be inserted to make up at least 1.8mm of distance.
If i keep multiplier as 15, then steps to compensate for upto 2.7mm of distance shall be inserted?