Unpredicted nozzle damage to bed
The maker of this printer obmitted one important topic from the calibration instructions and failed to give it much importance!
The probe operates differntly at different temperatures. This cannoit be understressed!!!!! The printer checks the bed for calibration before each print and if the nozzle is close to the bed, and heats up, the result is disastrious. This is worse when working with materials running at high temperatures.
This happpened to me many many times and I finsihed with the heatbed badly mutilated, then proceeded to re-calibrate and re-calibrate and re-calibrate, thinking that my printer had lost the calibration when the real reason for the nozzle digging into the bed is that the pinda cannot run at that temperature and the sensing distance is off with the heat....
I used to think that somehow my printer lost the calibration. You finish a print and not to let the nozzle and bed cool, you just re-heat while you select the file to run and in the time itt takes to reheat up to the desired temperature, the pinda is hot and its function is impaired and the nozzle digs the bed. They should have had the decency to advise us to always lift the head off the bed during heatup....
Re: Unpredicted nozzle damage to bed
They should have had the decency to advise us
You only have to read the forums.
This has been know for some time and has been addressed with the Mk3 and Mk2.5 upgrade.
Peter
Please note: I do not have any affiliation with Prusa Research. Any advices given are offered in good faith. It is your responsibility to ensure that by following my advice you do not suffer or cause injury, damage…
Re: Unpredicted nozzle damage to bed
While waiting for my new MK3 unit, I've been reading all the posts in this and other forums and all of the manuals that Prusa has put out. As a result of Peters and other posts, I am aware of the change of sensitivity of the sensor with what appears to be heat and the possibility of damage to the heat bed.
The next step in my problem solving is identifying steps I could take during calibration and running my new unit to reduce or eliminate the chance of collision between the nozzle and the bed. Do any of the users here have a suggestion?
Re: Unpredicted nozzle damage to bed
simply move the extruder to a height of say 100mm above the bed, before starting to heat the bed on your printer for the next print.
regards Joan
I try to make safe suggestions,You should understand the context and ensure you are happy that they are safe before attempting to apply my suggestions, what you do, is YOUR responsibility. Location Halifax UK
Re: Unpredicted nozzle damage to bed
In addition to Joan's suggestion, consistency of what you do is the key.
Find out what works for you and do the same every time.
Peter
Please note: I do not have any affiliation with Prusa Research. Any advices given are offered in good faith. It is your responsibility to ensure that by following my advice you do not suffer or cause injury, damage…