Wow thank you gr5 for that detailed answer, the "why" is solved, I checked my power brick "GST220A24-R78"....
But I am a bit disappointed from Ultimaker when they really changed to a less powerfull power brick with a clear disadvantage, because the specs say clearly:
180 °C to 260 °C
So it should be possible to print 260°C Nozzle temperature and 50°C build plate? Ultimaker?
So my options are:
-
Insist that my UM2+ should be able to print with my configuration:
- Ultimaker should change theirs specs or should solve the problem with a firmware update?
- Get the tinker firmware
- Try a higher bet temperature? But I need it in the range of 40-50°C....
- Buy a new 24V power supply >250: not an option for me because I use my UM2+ in the advertised range
So I will start with #1: Ultimaker Team?
Thanks in advance
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gr5 2,224
It's the power brick. It's definitely your power brick. When the UM2 first came out the power bricks had a nice margin of power but the newer bricks are borderline ready to trip. I would strongly consider trying to find one without the "T" in the name - the second one below:
GST220A24-R7B
GS220A24-R7B
The one without the T can handle a higher power load.
So why does it do it with 60C bed versus 80C bed? Well the resistance changes quite a bit with temperature. At the higher temps the bed is higher resistance and less wattage. At 40C the bed can draw more power.
The UM3 uses the same power supply and the same bed but it has some new firmware that calculates the power draw of the bed at different temperatures and has power management that keeps the bed from sucking down too much power when it is still "cold".
So another solution is to keep the bed hotter I suppose?
Or you could buy a 24V power supply that is MUCH more than 221W. Maybe a 250W or 300W supply but you might have to cut the cable from your existing supply and solder it onto the new supply. But it's worth it.
Oh!! Another solution is to get the tinker firmware. It has a power management feature. Set the bed to 160W, the nozzle to 35W and the budget to 170W. This will keep the bed from going to full power at the same time the nozzle is at full power. For example if the nozzle is on full power the software will assume it's using 35 of the 170W budget and that leaves 170-35 or 135 watts and since you told the software the bed is 160W it will not power it up more than 135/160 or 84% max when the nozzle is on. But when you are initially heating up the bed and the nozzle heater is off it will assume the bed is 160W and the budget is 170W so there will be no power limiting and it will apply full power.
tinker marlin here:
https://github.com/TinkerGnome/Ultimaker2Marlin/releases
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