Part Shifting Again Again and Again

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Vicky@Raise3D
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Joined: Fri Mar 25, 2016 3:54 am

Re: Part Shifting Again Again and Again

Postby Vicky@Raise3D » Fri Aug 10, 2018 12:33 am

Based on your description, I would recommend to do one or more times of the alignments.
Even when we need to do the alignment for the axis in our lab, we will carry it out several times based on the printing result. Normally the shifting will be reduced some then reduced until none.

Snalios
Posts: 13
Joined: Thu Aug 09, 2018 1:39 pm

Re: Part Shifting Again Again and Again

Postby Snalios » Tue Aug 14, 2018 2:09 pm

We're having the exact same issue with shifts. Different directions. Different locations. All my connection points are tight. I've done the gantry alignment once so far. I can check the driver voltages, but at this point we can't trust this printer to complete anything without a shift.

Snalios
Posts: 13
Joined: Thu Aug 09, 2018 1:39 pm

Re: Part Shifting Again Again and Again

Postby Snalios » Tue Aug 14, 2018 2:56 pm

I also tried moving the print head with the motors enabled. No movement what so ever. Also, my motor couplers are tight and show no signs of fatigue.

Alex M.
Posts: 136
Joined: Tue Apr 10, 2018 4:59 pm

Re: Part Shifting Again Again and Again

Postby Alex M. » Tue Aug 14, 2018 7:13 pm

Snalios wrote:We're having the exact same issue with shifts. Different directions. Different locations. All my connection points are tight. I've done the gantry alignment once so far. I can check the driver voltages, but at this point we can't trust this printer to complete anything without a shift.


When does it shift? Right in the beginning or a ways in to the print? If it's the later, did you check the motor temp after printing for a while?
Also, I am assuming your rods are clean and greased?

Snalios
Posts: 13
Joined: Thu Aug 09, 2018 1:39 pm

Re: Part Shifting Again Again and Again

Postby Snalios » Tue Aug 14, 2018 8:36 pm

Rods are cleaned and greased. It generally happens later in the print. So I will definitely check motor temp.

Vice Chief
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Joined: Wed Aug 23, 2017 5:04 am
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Re: Part Shifting Again Again and Again

Postby Vice Chief » Tue Aug 14, 2018 9:35 pm

One possibility would be that the filament is "holding" the gantry at one point in the print. If the motor torque is marginal or the roll is catching briefly, it could cause lost steps and a layer shift.

This could be in conjunction with your motors overheating (and so losing torque).

Snalios
Posts: 13
Joined: Thu Aug 09, 2018 1:39 pm

Re: Part Shifting Again Again and Again

Postby Snalios » Tue Aug 14, 2018 9:52 pm

Was told to decreased X/Y rapid movement speed to increase torque from extra tension from filament sensor. Also to install full length guide tube. I had 2 small pieces attached to either end before. I have my electronics box open to allow for better air flow. And the print I'm running now was sliced with Ideamaker and not S3D. Was told S3D has different accelerations values fro the motors which could be at fault.


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