RE: 6.4.0-RC Firmware for Prusa CORE One
The X/Y axis are homed first and move to a position over the bed itself. The Z moves up until the nozzle is sensed, then it raises, moves to a position over the corner of the bed (testing a bed is there) and raises again. IF it misses the bed - it fails and wont proceed until it is homed properly and senses a bed. Automatic homing is perfectly safe. Try it..
Oh right, the firmware moves the bed down first, then homes XY, then Z. Then indeed my first concern is not an issue (except for the very minor chance of crashing the bed into the bottom end stops during the initial brief movement downwards).
But having any object, and in particular the prior print, still on the heatbed does make homing unsafe, right? So I am still not sure whether I would want it to happen automatically when I power on the printer, which I understood to be your suggestion.
RE: 6.4.0-RC Firmware for Prusa CORE One
...BUT - there are a few bugs still outstanding ...
Thanks for following up on the bugs - please read my comment only as "no issues observed during a few casual prints".
RE: 6.4.0-RC Firmware for Prusa CORE One
Why would you leave a prior print on the bed with printer powered off? You deserve to crash for being stupid if you do.
Not necessarily.
I use my H2D completely remotely, for example. It's stored in a separate building to my computer. So I power it on remotely, send the print job and let it print. When printing is done I get a notification. Once the nozzles have cooled I remotely power off the printer. That doesn't mean I have collected the print yet - I'll go out and collect it when I want, or need to later on when passing.
Granted, I do always know if a print is waiting collection, and I would never power up the printer, or home it, when I know I have a completed print waiting, but even so, it goes to show there are some legitimate reasons as to why a print may remain on the bed and the printer powered off......
RE: 6.4.0-RC Firmware for Prusa CORE One
Many people use remote power switches with their printers and may power the printer off and on without being next to it.
+1
I use a remote power switch even when I'm standing next to my printer, for the simple reason that the power button is out of reach on all new Prusa printers since the MK4. On the XL and C1 we need two elbows to reach them and there is no way to put them in low power mode from the front...
I also turn off my printers remotely from work when printing is finished.
RE: 6.4.0-RC Firmware for Prusa CORE One
@steve-33
Thanks for being brave enough to test it for me so I don't have to 🙂 I have three different prusa printers to consider and I'm curious when the firmware version will be unified for them again.
I feel your pain for you 🙂 I worked in Process Control/Automation and CNC Design, install and repair for years before I retired and unified firmware for multiple different machines was often a bug ridden problem and turned firmware into complex bloatware. Some parts like Gcode and some Mcodes were common for all machines but that was about it. If you go into the engineer screens on a Fanuc CNC control there are multiple pages of parameters and to write them to the controller there are often multiple choices that have to be entered in binary! So easy to make a mistake that could be very expensive and/or dangerous. I don't miss it one bit 😉.
RE: 6.4.0-RC Firmware for Prusa CORE One
Many people use remote power switches with their printers and may power the printer off and on without being next to it.
+1
I use a remote power switch even when I'm standing next to my printer, for the simple reason that the power button is out of reach on all new Prusa printers since the MK4. On the XL and C1 we need two elbows to reach them and there is no way to put them in low power mode from the front...
I also turn off my printers remotely from work when printing is finished.
The problem is on power on Core One incorrectly assumes Z is at zero! If the bed is low down and you want to change or load filament you often can't knowing it's going to move down and potentially crash Z and you can't raise it manually higher up with Control/Move Axis. Currently you have to remember to do an Auto-home first. Then do an unload or load filament.
Perhaps home on power on is unsuitable for some but on the likes of Core3 or 4 derivatives you get it whether you want it or not 😁 but it could be an optional setting?
On most commercial CNC machines on power on you can manually move all axis to position, change tools or clean/lubricate or remove work etc. They wont do any automatic moves until either the operator has manually input axis positions or all axis have been homed.
Maybe allowing manual moves despite where it thinks axis are could work?
RE: 6.4.0-RC Firmware for Prusa CORE One
Ive never had any issues when powering my core one on or off (I just reach for the plug socket rather then the power button around the back as its easier to reach!).
I power on (from plug socket) and unload/load filament normally, and then just print as required. I don't think I've ever actually manually done an auto-home on my Core One to be honest!
RE: 6.4.0-RC Firmware for Prusa CORE One
yes, this is one design choice from Prusa that I never really understood: why not spend 2$ more and route the power switch in front, making usability much simpler?
RE: 6.4.0-RC Firmware for Prusa CORE One
why not spend 2$ more and route the power switch in front, making usability much simpler?
It makes electrical safety compliance much easier if mains power only occurs within a pre-built, certified box. Especially when you want to offer kits.
One of the most popular Core One add-ons on Printables is a mechanical power switch extension. I have not tried it myself since my printer is placed such that I can easily reach behind it -- but it seems to address a real need for many: https://www.printables.com/model/1433400-power-switch-adapter-core-one
RE: 6.4.0-RC Firmware for Prusa CORE One
There is no need to cut the main power from the front. Many devices on the market only enter standby mode (low-power mode) and can be awakened by a simple signal. This can be a push button on the front, a remote control (like TVs), or even through the network (Wake-on-LAN).
Theoretically, I would say this is achievable with the current machines, purely through firmware. When entering sleep mode, the firmware could shut down as much electronics as possible and switch to a low-power state. To wake it up, simply press the reset button, and you're good to go.
Maybe not the most efficient low-power mode (since the PSU remains powered), but definitely better than leaving the printer as it is, with the LEDs and screen on.
RE: 6.4.0-RC Firmware for Prusa CORE One
why not spend 2$ more and route the power switch in front, making usability much simpler?
It makes electrical safety compliance much easier if mains power only occurs within a pre-built, certified box. Especially when you want to offer kits.
One of the most popular Core One add-ons on Printables is a mechanical power switch extension. I have not tried it myself since my printer is placed such that I can easily reach behind it -- but it seems to address a real need for many: https://www.printables.com/model/1433400-power-switch-adapter-core-one
I use this mod and it works well. No longer have to give my printer a reach around to turn it on... 🧐
RE: 6.4.0-RC Firmware for Prusa CORE One
I've only ever used a smart plug on mine, it means I can switch it on/off from anywhere within shouting distance of an Alexa, but what I really like about the Tapo ones is most have built in energy monitoring. You can just enter what you pay per KWh, and easily see the current consumption or what the printer is costing to run per day/week/month/year etc. It also shows daily/weekly/monthly/annual charts.
All for about £10 IIRC.
RE: 6.4.0-RC Firmware for Prusa CORE One
I've only ever used a smart plug on mine, it means I can switch it on/off from anywhere within shouting distance of an Alexa, but what I really like about the Tapo ones is most have built in energy monitoring. You can just enter what you pay per KWh, and easily see the current consumption or what the printer is costing to run per day/week/month/year etc. It also shows daily/weekly/monthly/annual charts.
All for about £10 IIRC.
I was thinking of that approach. Wasn't sure if the power switch on the power supply has some sort of delay that shuts things down cleanly like the power panic logic? Obviously the board is running realtime OS and not Linux so there is no state keeping to worry about. I've noticed that when I just cut the power as in literally pull the plug I've seen issues with Red panic screens and occasionally BSOD when I turn the printer back on. I've only done this a few times (once I lost power, the other I just turned off the power strip). I could just be over-thinking this though.
RE:
All my printers are on Kasa/Tapo smartplugs and I have an Amazon Echo on the desk in my workshop so all I need to do is say "Alexa, turn on the Prusa Blue" or "Alexa, turn off the Prusa Orange" (printers are color coded). I've had that setup for at least five years. Never seen any issues whatsoever.
Formerly known on this forum as @fuchsr -- https://foxrun3d.com/
RE: 6.4.0-RC Firmware for Prusa CORE One
I was thinking of that approach. Wasn't sure if the power switch on the power supply has some sort of delay that shuts things down cleanly like the power panic logic?
Nah, the switch at the back just kills the mains to the PSU. Switching off via smart plug is exactly the same as switching off via the Core One Switch at the back.
RE: 6.4.0-RC Firmware for Prusa CORE One
We have IT. 🤣
https://github.com/prusa3d/Prusa-Firmware-Buddy/releases/tag/v6.4.0
RE: 6.4.0-RC Firmware for Prusa CORE One
haha, forgive me if I wait until others install this and bless it before I do lol
RE: 6.4.0-RC Firmware for Prusa CORE One
It turns on, turns off, and homes itself. She even replaced the filament 🤣
haha, forgive me if I wait until others install this and bless it before I do lol
RE: 6.4.0-RC Firmware for Prusa CORE One
I'm actually reading the release notes now and stumbled across the following:
Lazier homing, more cautious calibration
[...] For unload operations with auto-retraction, homing is still performed to ensure the correct filament removal angle.
I had observed my Core One perform the homing before it unloaded filament, and had been wondering what the rationale was. But that text does not make it any clearer me. Could someone help me out and explain what the "filament removal angle" is, where it is measured, and how it depends on XYZ homing? Many thanks!
RE: 6.4.0-RC Firmware for Prusa CORE One
I'm more interested in whether this is safe for the MK4S and XL too. My three prusa printers are currently stable and before I rush out and update to 6.4.0 on all of them I'd like to get positive feedback on those others too.