RE: Prusa CORE One kit assembly instructions
I'm sure I read in the instructional guide to do it with the printer switched off......
Either way, I also used the web version for my MK4s with results that I never had any issues with. Hoping the same is true here!
How are you guys getting the xy belt tension dialled in? The prusa app way is pretty hopeless as most of the time it's completely unresponsive to my twanging.
Regardless, I'm seriously impressed with the printer so far.
Web version https://belt.connect.prusa3d.com works better. Don't forget to turn off motors (it's missing in instructions there).
Yeah it's either printer switched off, or motors disabled in menu.
RE: Prusa CORE One kit assembly instructions
Anyone know if the timeout can be adjusted for the LEDs dimming? I like the fact they dim, but would like them to stay on full brightness for longer.
Also I can find the option to disable the Chewbacca noise when the Z drops at the end of a print 😂
RE: Prusa CORE One kit assembly instructions
Anyone know if the timeout can be adjusted for the LEDs dimming? I like the fact they dim, but would like them to stay on full brightness for longer.
Also I can find the option to disable the Chewbacca noise when the Z drops at the end of a print 😂
To fix the groaning Z drive, it will probably be sufficient to lubricate the lead screws. The POM trapezoidal nuts should be designed to run dry, but many users have reported in the meantime that lubrication was necessary to avoid the noise, or even the Z drive getting stuck sporadically.
You may also want to ensure that the lead screws and the smooth rods agree upon where they want to push the heatbed laterally: Drive the heatbed all the way down, loosen the 2 screws at each of the three black trapezoidal nuts on the lead screws to let them all "settle" to the correct lateral position (determined by the smooth rods). Then gradually tighten all six screws. Do not overtighten them; you don't want to distort the nuts.
I am not aware of a way to adjust the light dimming timeout. But maybe there is an undocumented G-code for this, similar to M84 for setting the motor hold current timeout?
RE: Prusa CORE One kit assembly instructions
I am not aware of a way to adjust the light dimming timeout. But maybe there is an undocumented G-code for this, similar to M84 for setting the motor hold current timeout?
I took a quick look at the code. Unless I took a wrong turn, the timeout is currently hard-coded to two minutes in side_strip_control.hpp:
const int active_timeout_ms = 120 * 1000;
RE:
Anyone know if the timeout can be adjusted for the LEDs dimming? I like the fact they dim, but would like them to stay on full brightness for longer.
Also I can find the option to disable the Chewbacca noise when the Z drops at the end of a print 😂
To fix the groaning Z drive, it will probably be sufficient to lubricate the lead screws. The POM trapezoidal nuts should be designed to run dry, but many users have reported in the meantime that lubrication was necessary to avoid the noise, or even the Z drive getting stuck sporadically.
You may also want to ensure that the lead screws and the smooth rods agree upon where they want to push the heatbed laterally: Drive the heatbed all the way down, loosen the 2 screws at each of the three black trapezoidal nuts on the lead screws to let them all "settle" to the correct lateral position (determined by the smooth rods). Then gradually tighten all six screws. Do not overtighten them; you don't want to distort the nuts.
I am not aware of a way to adjust the light dimming timeout. But maybe there is an undocumented G-code for this, similar to M84 for setting the motor hold current timeout?
Loosening and then retightening the trapezoidal nuts with the heatbed all the way down definitely improved the issue for me. I get a tiny groan when the bed gets right to the bottom now, but waaaaay better than before. Cheers Jurgen
Hopefully, adjusting the timeout for dimming the LEDS can be added to the UI menu at some point. It's a minor thing but Id like the option.
RE: Prusa CORE One kit assembly instructions
I am not aware of a way to adjust the light dimming timeout. But maybe there is an undocumented G-code for this, similar to M84 for setting the motor hold current timeout?
Please no, that is a misuse of gcode. Just use a settings file like everyone else from >1980.
RE: Prusa CORE One kit assembly instructions
I've always found the tuning app a bit of a challenge. When I used it on my MK4 it said my Y axis right even when it really wasn't. I printed a couple of these and am thinking of giving them a go during the Core One build. At the very least I'll be able yo compare the results to the app.
RE: Prusa CORE One kit assembly instructions
I've always found the tuning app a bit of a challenge. When I used it on my MK4 it said my Y axis right even when it really wasn't. I printed a couple of these and am thinking of giving them a go during the Core One build. At the very least I'll be able yo compare the results to the app.
Are we sure all these different printer's belts should have the same tension though? And irritatingly I don't have any Prusa PETG which could throw things off I think.
RE: Prusa CORE One kit assembly instructions
Well I don't and they stopped updating at the MK4 so nothing for a 4S or Core One. I have a spool of Prusament PETG so will give it a shot. Like I said, I can compare it to the app and see. I don't believe it will over-tighten the belts.
I've always found the tuning app a bit of a challenge. When I used it on my MK4 it said my Y axis right even when it really wasn't. I printed a couple of these and am thinking of giving them a go during the Core One build. At the very least I'll be able yo compare the results to the app.
Are we sure all these different printer's belts should have the same tension though? And irritatingly I don't have any Prusa PETG which could throw things off I think.
RE: Prusa CORE One kit assembly instructions
I much prefer a simple little tool like this compared to the plucking approach.
I've found plucking the same belt 2-3 times in a row can yield 2-3 different results which isn't helpful to anyone. I think there too many variables involved (where you pluck it, how hard you pluck it etc) for it to be considered reliable.
RE: Prusa CORE One kit assembly instructions
Anyone know if the timeout can be adjusted for the LEDs dimming? I like the fact they dim, but would like them to stay on full brightness for longer.
Also I can find the option to disable the Chewbacca noise when the Z drops at the end of a print 😂
To fix the groaning Z drive, it will probably be sufficient to lubricate the lead screws. The POM trapezoidal nuts should be designed to run dry, but many users have reported in the meantime that lubrication was necessary to avoid the noise, or even the Z drive getting stuck sporadically.
You may also want to ensure that the lead screws and the smooth rods agree upon where they want to push the heatbed laterally: Drive the heatbed all the way down, loosen the 2 screws at each of the three black trapezoidal nuts on the lead screws to let them all "settle" to the correct lateral position (determined by the smooth rods). Then gradually tighten all six screws. Do not overtighten them; you don't want to distort the nuts.
I am not aware of a way to adjust the light dimming timeout. But maybe there is an undocumented G-code for this, similar to M84 for setting the motor hold current timeout?
The dreaded Chewbacca noise has returned 😂
I've contact support so see what they say....they have forwarded it to the developer so Im not expecting a swift response.
I'm hesitant to start lubricating something that should be self lubricating.
RE: Prusa CORE One kit assembly instructions
The dreaded Chewbacca noise has returned 😂
I've contact support so see what they say....they have forwarded it to the developer so Im not expecting a swift response.
I'm hesitant to start lubricating something that should be self lubricating.
I understand the reluctance, but lubrication seems to be the only known countermeasure. It was the same for me. Long-term Prusa owners have confirmed that they have always lubricated the lead screws in their other printers and have not seen any adverse effect, as long as no dirt is allowed to accumulate.
Given that Prusa is only supporting the lead screws at the bottom end, and just lets the top end float freely, I am not surprised that the Z stepping can excite vibrations once the free, unsupported end of the lead screw becomes long enough. Let's see what Prusa support has to say about this. My money is on either "lubricate it", or "it's normal". 🙄
RE: Prusa CORE One kit assembly instructions
I shall update when/if I hear back from them.
RE: Prusa CORE One kit assembly instructions
Given that Prusa is only supporting the lead screws at the bottom end, and just lets the top end float freely, I am not surprised that the Z stepping can excite vibrations once the free, unsupported end of the lead screw becomes long enough. Let's see what Prusa support has to say about this. My money is on either "lubricate it", or "it's normal". 🙄
My MK4 and MK4S occasionally do (did?) this. Since following the threads here I've also lubricated them with a smear of the bearing grease and they seem better. The tops of the lead screws are unsupported on those printers too. If it is indeed a resonance induced by the frequency of the z-stepper steps, then a few thoughts occur:
- The lubricant perhaps acts as a damper between the screws and the nuts, as well as reducing friction?
- Perhaps varying the speed of the large z-moves, i.e. to change the step frequency, would move the excitation frequency away from the resonant frequency.
- On the MK4/4S setups, it seems like it might be possible to apply a very soft 'damper' of some sort around the tip of the lead screw at the top end - perhaps a TPU collet with only 1 perimeter and very little infill. That may be sufficient to prevent the resonance occurring. Is there something at the top of the z-screws on the Core One that such a damper could be fitted to? The next time I remember, I'll apply a little finger pressure to the top of the lead screws to see if the sound changes.
RE: Prusa CORE One kit assembly instructions
Given that Prusa is only supporting the lead screws at the bottom end, and just lets the top end float freely, I am not surprised that the Z stepping can excite vibrations once the free, unsupported end of the lead screw becomes long enough. Let's see what Prusa support has to say about this. My money is on either "lubricate it", or "it's normal". 🙄
My MK4 and MK4S occasionally do (did?) this. Since following the threads here I've also lubricated them with a smear of the bearing grease and they seem better. The tops of the lead screws are unsupported on those printers too. If it is indeed a resonance induced by the frequency of the z-stepper steps, then a few thoughts occur:
- The lubricant perhaps acts as a damper between the screws and the nuts, as well as reducing friction?
- Perhaps varying the speed of the large z-moves, i.e. to change the step frequency, would move the excitation frequency away from the resonant frequency.
- On the MK4/4S setups, it seems like it might be possible to apply a very soft 'damper' of some sort around the tip of the lead screw at the top end - perhaps a TPU collet with only 1 perimeter and very little infill. That may be sufficient to prevent the resonance occurring. Is there something at the top of the z-screws on the Core One that such a damper could be fitted to? The next time I remember, I'll apply a little finger pressure to the top of the lead screws to see if the sound changes.
Mine's coming from the front left lead screw. Literally resting my finder on it makes the sound completely disappear.
RE: Prusa CORE One kit assembly instructions
The printable parts for the Core One seem to have been updated today: https://www.printables.com/model/1167816-core-one-printable-parts/files
Does anyone have any recommendations for which parts would benefit from being re-printed in better quality before I crack on with my build next week? @Jürgen, I recall you mentioning some screws that didn't seem to bite very tightly into the plastic screw holes (idler parts?) - I may consider having a go at narrowing those holes slightly with OpenSCAD if you could point us to the corresponding part files.
RE: Prusa CORE One kit assembly instructions
Does anyone have any recommendations for which parts would benefit from being re-printed in better quality before I crack on with my build next week? @Jürgen, I recall you mentioning some screws that didn't seem to bite very tightly into the plastic screw holes (idler parts?) - I may consider having a go at narrowing those holes slightly with OpenSCAD if you could point us to the corresponding part files.
In my kit, it was most notable in the XY motor mounts (steps 5.17 and 5.19 of the build instructions; the M3x30 screws which serve as axles for the dual idlers). I think others mentioned some different parts in their kits.
It is probably not too critical as long as you don't overtighten the screws. They only see lateral load, nothing is trying to pull them out. The parts are printed from PCCF, which you may or may not be able to print well with your other printer(s). Personally I wouldn't bother reprinting them.
RE: Prusa CORE One kit assembly instructions
Thanks Jürgen - I'll probably save my PCCF in that case. I may still have a play with those model files.
I have plenty of Prusa orange ASA, so I'm tempted to reprint the PETG parts, especially the black parts, partly because I've never been a fan of black parts (very difficult to work on except in good light) and partly just 'to make it my own'.
RE: Prusa CORE One kit assembly instructions
The dreaded Chewbacca noise has returned 😂
I've contact support so see what they say....they have forwarded it to the developer so Im not expecting a swift response.
I'm hesitant to start lubricating something that should be self lubricating.I understand the reluctance, but lubrication seems to be the only known countermeasure. It was the same for me. Long-term Prusa owners have confirmed that they have always lubricated the lead screws in their other printers and have not seen any adverse effect, as long as no dirt is allowed to accumulate.
Given that Prusa is only supporting the lead screws at the bottom end, and just lets the top end float freely, I am not surprised that the Z stepping can excite vibrations once the free, unsupported end of the lead screw becomes long enough. Let's see what Prusa support has to say about this. My money is on either "lubricate it", or "it's normal". 🙄
I think I've fixed it, ridiculously simple if it turn out to be a permanent fix...I've done about 5/6 prints and the z noise is gone, it was making noise every time a print finished until now.
I'm hesitant to post the solution as I thought I fixed it before but it returned 😂
RE: Prusa CORE One kit assembly instructions
The dreaded Chewbacca noise has returned 😂
I've contact support so see what they say....they have forwarded it to the developer so Im not expecting a swift response.
I'm hesitant to start lubricating something that should be self lubricating.I understand the reluctance, but lubrication seems to be the only known countermeasure. It was the same for me. Long-term Prusa owners have confirmed that they have always lubricated the lead screws in their other printers and have not seen any adverse effect, as long as no dirt is allowed to accumulate.
Given that Prusa is only supporting the lead screws at the bottom end, and just lets the top end float freely, I am not surprised that the Z stepping can excite vibrations once the free, unsupported end of the lead screw becomes long enough. Let's see what Prusa support has to say about this. My money is on either "lubricate it", or "it's normal". 🙄
I think I've fixed it, ridiculously simple if it turn out to be a permanent fix...I've done about 5/6 prints and the z noise is gone, it was making noise every time a print finished until now.
I'm hesitant to post the solution as I thought I fixed it before but it returned 😂
You can't keep us in suspense now 😅
Scott