1 Topic by Dave455

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Topic: Monoprice Maker Ultimate - bed heater current

Does anyone know how many amps it draws?
The connector is failing, I need to replace it.

Dave
3D printer - Monoprice Maker Ultimate with mods-
microswiss hot end, Bondtech extruder, twin cooling fans & ducts, insulated heater block, enclosed with Lexan like the Wanhao D6 it is based on.

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2 Reply by Tin Falcon

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Re: Monoprice Maker Ultimate - bed heater current

You should be able to put a mete on it then use ohm law


10 ohms would give you  2.4 amps or just under 60 watts.

THIS is just a ballpark GUESS

Soliddoodle 4 stock w glass bed------Folger Tech Prusa 2020 upgraded to and titan /aero extruder mirror bed
FT5 with titan/ E3D Aero------MP mini select w glass bed
MP Utimate maker pro-W bondtech extruder
Marlin/Repetier Host/ Slic3r and Cura

3 Reply by carl_m1968

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Re: Monoprice Maker Ultimate - bed heater current

Tin Falcon wrote:

You should be able to put a mete on it then use ohm law


10 ohms would give you  2.4 amps or just under 60 watts.

THIS is just a ballpark GUESS

Tim I am not trying second guess you but from my experience most bed heaters are very low resistance like in the neighborhood of 2 to 4 ohms. They are usually the highest consumer of current in a printer and usually pull 7 or more amps at initial heating and will drop off a bit once up to temp and bang bang kicks in.

Printing since 2009 and still love it!
Anycubic 4MAX best $225 ever invested.
Voxelabs Proxima SLA. 6 inch 2k Mono LCD.
Anycubic Predator, massive Delta machine. 450 x 370 print envelope.

4 Reply by Dave455

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Re: Monoprice Maker Ultimate - bed heater current

I'll have to wait for the long print to end before I can mess with the one running.  The printer I'm working on, the connection is bad enough, I wouldn't trust it to give me an accurate reading.   Was just hoping someone knew.  Are there any schematics or service manuals available for these printers?

Dave
3D printer - Monoprice Maker Ultimate with mods-
microswiss hot end, Bondtech extruder, twin cooling fans & ducts, insulated heater block, enclosed with Lexan like the Wanhao D6 it is based on.

Dave455's Website

5 Reply by carl_m1968 (edited by carl_m1968 2019-06-21 10:25:09)

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Re: Monoprice Maker Ultimate - bed heater current

Dave455 wrote:

I'll have to wait for the long print to end before I can mess with the one running.  The printer I'm working on, the connection is bad enough, I wouldn't trust it to give me an accurate reading.   Was just hoping someone knew.  Are there any schematics or service manuals available for these printers?

All you need is to know two values then applied ohms law. You need the system voltage and the resistance of the bed. Measure the resistance with a DMM directly at the bed terminals while power is off and disconnected from controller. Once you have those values you simply divide the voltage by resistance and gives you the current.

Printing since 2009 and still love it!
Anycubic 4MAX best $225 ever invested.
Voxelabs Proxima SLA. 6 inch 2k Mono LCD.
Anycubic Predator, massive Delta machine. 450 x 370 print envelope.

6 Reply by Tin Falcon (edited by Tin Falcon 2019-06-21 10:35:49)

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Re: Monoprice Maker Ultimate - bed heater current

Carl not a problem to second guess. safety is what is important here.
As far as tech manuals I am not aware of any monoprice and wanhoa both have good User manuals available on line.

the only data I see is a power consumption rating of 200 -220 wats so base your amps on that and you should be safe.

say 12  ams to be safe

Soliddoodle 4 stock w glass bed------Folger Tech Prusa 2020 upgraded to and titan /aero extruder mirror bed
FT5 with titan/ E3D Aero------MP mini select w glass bed
MP Utimate maker pro-W bondtech extruder
Marlin/Repetier Host/ Slic3r and Cura

7 Reply by Dave455

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Re: Monoprice Maker Ultimate - bed heater current

Going by Ohm's law, the heater is 2.1 ohm, so at 24V it is going to draw 11.42 Amps.

The connector I decided to use  has pins rated for 6 amps, and I paralleled 4 for each side of the heater.    I can post pictures later.

Dave
3D printer - Monoprice Maker Ultimate with mods-
microswiss hot end, Bondtech extruder, twin cooling fans & ducts, insulated heater block, enclosed with Lexan like the Wanhao D6 it is based on.

Dave455's Website

8 Reply by Dave455 (edited by Dave455 2019-06-22 03:53:27)

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Re: Monoprice Maker Ultimate - bed heater current

The connector is the kind used on ATX motherboards,  cut to 8 pins.  Because I had them available now, and they fit, and would easily handle the current.  It's not good to be using parts right at their absolute maximum ratings.  I found the bad connector while doing my first build plate upgrade -

New FLAT build plate.  This worked better than I even expected!  I ran a test print of small parts, located in each corner and the center - they all came off with similar effort /ease, and the squish of the first layer looks closer than I have ever seen, if not identical,

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Dave
3D printer - Monoprice Maker Ultimate with mods-
microswiss hot end, Bondtech extruder, twin cooling fans & ducts, insulated heater block, enclosed with Lexan like the Wanhao D6 it is based on.

Dave455's Website