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Ulticreatr Dual Extrusion upgrade

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I am pretty sure that you cannot use that one with the heated bed by default since the power supply will be overloaded and turn itself off, causing the printer to reboot (since it got very high-power heater cartridges)

You would need to get a heftier power supply (at least 350W @ 24V), and then there is the question about if the mainboard will heat up too much and need a cooling fan because of the extra current.

A dirtier (but possibly cheaper) way of doing it would be to add a solid-state relay to the heated bed output on the board, and power the heated bed from another power supply trough the SSR.

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As I understood, the standard Ultimaker 2 has 25W heating power.

Is the cooling of the Ulticreatr 2x kit really much better so that the 2x25W are not enough to heat up the heads?

Does anyone have experience with Ulticreatr 2x and 2x25W?

Otherwise, what is the best solution to work with 2x35W (heating of both hotends and the build plate activated at the same time)?

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Well, it not that the cooling is "better", and i have not tried that kit myself, but from what i have seen, they solve the problem of being able to rapidly cool/heat the nozzles when switching, by adding a huge heat sink that pulls away a lot of heat from the heater block continuously (which makes it cool very fast when the power is turned off), and counteract that by adding extreme 75W heaters to be able to keep the temperature up when printing.

Since they opted for 75W heaters, i do believe that a 25W heater (1/3rd of the power) would not be enough to heat it to printing temperatures.

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