Failed Y-calibration of a new CoreOne  

RE: Failed Y-calibration of a new CoreOne

Thank you for checking! Good to know that the Prusa app does a good job with the frequency measurement.

So maybe the build technician in the Prusa factory was using some other metric to set the belt tension, which systematically deviates from the frequency measurement? Maybe some force-over-distance gauge, or maybe just his "calibrated thumb"? 😉 

RE: Failed Y-calibration of a new CoreOne

When we fit new belts to machines, we always over tension them from new as they will relax, but these are steel wire embedded timing belts, and we never drop the tension lower.

These belts are different and even support state to drop all tension then tighten to the correct frequency reading, so maybe the over tensioning is done on purpose ? but I really don't know in this particular case. Maybe someone from PRUSA could explain?

What I do know is after I have done all my pre-flight checks so to speak, the printer is printing beautifully with the supplied roll of prusament PLA. Even 65 Deg Overhangs have come out spot on. Next step PETG

So far very pleased with this printer.

RE: Failed Y-calibration of a new CoreOne

Just wondering if any more development on this front? Whilst i am still awaiting my CoreOne, I sincerely hope Prusa has addressed this issue?

Have recent (last 2 weeks) owners experienced this issue?

Thank you

RE:

I just got a replacement for my first one.

first one was heavily non-squared and went back, i received a new one 2 hours ago and it keeps failing on y calibration.

I don’t think the problem is on the printer but in assembly qc, never got 2 flukes in a row. I’ll wait until beta test phase is over to buy it again.

RE: Failed Y-calibration of a new CoreOne

thank you for the answer! btw when do you think that beta phase will be over?

RE: Failed Y-calibration of a new CoreOne

Usually after some months after release: software bugs get fixed, hardware revisions come out (documented if big enough, undocumented if not) but most importantly quality control becomes decent again after the initial rush.

For sure I’m biased but at the moment, is a mess

I had this issue today. It was caused by shipping damage in my case.

Self test failed Y-Axis test like you all.  Upon closer inspection I noticed there was a big dent in the outside of the housing and this was causing the Y-Axis to collide with the wall of the printer when it tried to traverse beyond half way!

Check your printer for damage, I think Prusa's shipping box isn't so robust for international shipping in this case.

This is where it was colliding on the inside:

Re: I had this issue today. It was caused by shipping damage in my case.

To clarify, Prusa is sending me a replacement Core One because of the shipping damage.  I do wonder though if some of your axis alignment issues are coming from minor handling damage that isn't very obvious when casually looking at the printer.  For example: Maybe that angle started off as 90 degrees.

RE: Failed Y-calibration of a new CoreOne

Mine arrived in a perfect box, not a scratch or dent anywhere, not a mark on the printer, it still does the headbanger game a bit more persistently now after a week of use. It failed once on day one, I tuned belts which where a bit loose and added some grease as there where a bit of rough spots when I moved the head manually, I only did a visual squareness check for gaps so far. Since then it behaved ok but is degrading last few days. It did something funny today, while it was headbanging before a print I got a crash detection, while I was trying to figure out what happened it just taped the ends once and continued to start the print.