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Printed parts good enough?  

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Cynan
(@cynan)
Estimable Member
Printed parts good enough?

Lately my printer has been getting more “out of tune”, but before I go ahead and rebuild it I thought I might as well print out the new updated parts first. However the overhangs seem to be having difficulty too and there is significant “ringing” in places.

I updated the firmware recently, though did not reset to factory.l, assuming it would keep the old settings. It seems to have. Belt tests still show as fine. Grub screws tight. Perhaps the rods and/or bearings need cleaning?

or perhaps this is good as it gets without going to moon motors etc?

 

Best Answer by jsw:

My suggestion would be to fix what needs to be fixed and not totally rebuild things unless you need to.

The prints look more like slop or play than ringing.

It looks to me like there's some mechanical slop on one axis, perhaps loose pulley, misaligned pulley, loose belt, worn belt, loose hardware etc.

I would first go over the X and Y sections very carefully, making sure everything is tight and everything moves without sticking, then re-tighten the belts using your fingers and ears and not the numbers.  A good test for belt tightness is to hold the motor shaft tightly with pliers and try to move the associated carriage.  There should be no meaningful play or slop.

I certainly would not recommend replacing plastic parts with those that are printed with artifacts!

Posted : 31/12/2020 6:54 pm
Cynan
(@cynan)
Estimable Member
Topic starter answered:
RE: Printed parts good enough?

PS this was printed from Prusa’s supplied Mk3s gcode

Posted : 31/12/2020 8:42 pm
jsw
 jsw
(@jsw)
Famed Member
RE: Printed parts good enough?

My suggestion would be to fix what needs to be fixed and not totally rebuild things unless you need to.

The prints look more like slop or play than ringing.

It looks to me like there's some mechanical slop on one axis, perhaps loose pulley, misaligned pulley, loose belt, worn belt, loose hardware etc.

I would first go over the X and Y sections very carefully, making sure everything is tight and everything moves without sticking, then re-tighten the belts using your fingers and ears and not the numbers.  A good test for belt tightness is to hold the motor shaft tightly with pliers and try to move the associated carriage.  There should be no meaningful play or slop.

I certainly would not recommend replacing plastic parts with those that are printed with artifacts!

Posted : 01/01/2021 9:43 pm
Cynan liked
Cynan
(@cynan)
Estimable Member
Topic starter answered:
RE: Printed parts good enough?
A good test for belt tightness is to hold the motor shaft tightly with pliers and try to move the associated carriage.  There should be no meaningful play or slop.

This right here. Thanks. I thought they were tight already but this showed some movement. Tightened both up and reprinted the parts and now they look just as good as those supplied. I doubt I’ll get any better.

 

Posted : 02/01/2021 11:25 pm
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