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70w heater cartridges, safe? Viable?  

New Member
70w heater cartridges, safe? Viable?

 I'm trying to determine if 70w heater cartridges (seen here) are viable with a Prusa i3 Mk3S. 

Some concern over the gauge of wires for powering it from the PSU
if the mainboard can handle it
and if the PSU can handle it. 

Posted : 17/08/2021 7:56 am
Hot Stuff

maybe another question is do you actually need a 70Watt heater...?

will the PID profile be able to control the larger heater and prevent overshoot's

there is not a lot of thermal mass in a 3d printer heat block, I suspect you will end up with a lot of thermal ripple... 

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...
Posted : 17/08/2021 1:40 pm
bobstro liked
Trusted Member
Process Control

With my past experience of process control (I wrote the controller for a scientific research bench waterbath that was, at the time, the most stable in the world!), I feel @joantabb is right.  There is considerable risk that a heater 1.75 times more powerful is risking increase thermal ripple to the point where it may well start to impact quality.

I have recently switched to a Phaetus Dragon hotend, and with that the time to heat the bed and time to heat the bed are so close that there is no further advantage to more than 40W (this uses a copper heatblock).  With the V6 hotend, I believe similar timings would be achieved using a 50W heater.

What was your objective in proposing to use a 70W heater?

Posted : 19/08/2021 10:30 am