Original Prusa i3 MK2S is a successor to Original Prusa i3 MK2 with small hardware tweaks for easier assembly and improved reliability.

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Damaged the printer during first layer calibration

I built the kit without issues, found the Wizard for setup, and everything was going fine. It finished the X,Y,Z calibration without any paper-grabbing . I went to first layer calibration. I loaded the silver filament that came with the printer, that seemed to go correctly as well.

I started the first layer calibration. I did not record it, so don't remember everything. There was some question about "is the color clear?" I did not know what I was supposed to look at. I said "no" because my filament is silver. Then it went back to some other question and asked again if it was clear. Since I could go no where with NO I tried YES.

The nozzle moved to the corner nearest me and to my left, and, the next thing I knew, the heat bed was bent as the nozzle engaged the heat bed, scratching it for an inch or two as it moved to the right. I dove for the power button and shut it down.

I went back to the pinda calibration, but I cannot do it. The extruder/nozzle assembly has something broken in it. The extruder moves loosely in the printed parts assembly. Now I have to figure out how to disassemble, figure out which part broke, and then hope I don't make the same mistake again.

Any hints?


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Well, I took a long break, went back and looked at the extruder assembly. It came apart pretty easily (the first step was to remove both the fans, then it was easy to see the remaining screws holding halves of the bracket together.)

Oops. It was all my fault. Mr. Gravity (or maybe my cat) disturbed the extruder between the step I placed it in its bracket halves and I didn't notice when I screwed the two together. It was not in its assigned place and was hanging loosely below instead. Nothing is broken.

And now xyz cal works AND the first later cal worked AND I printed a PRUSA logo. I am happy now. I have a few grooves along the edge of my heat bed as scars from my experience but I think no permanent damage.

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Wayne will be eternally grateful.
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