Power consumption of MK3  

Re: Power consumption of MK3

At mean 60-100 W, maximum 200 at full heat, after it is just to maintain the heat-bed and the hot-end.
Somebody will clarify with some accuracy.

Re: Power consumption of MK3

Printer uses about 65Watt when printing with PLA. Occasional power spikes for a few seconds to 100Watt.
Printer uses about 45-55Watt average when printing with the heated bed off.
Printer uses about 120Watt average when printing ABS, power spikes to 180Watt.
Stock MK3 Printer pulls 240Watt from AC during heatup phase, which is not good because the PSU is rated at 240Watt. (may be a reason so many PSUs blow up)
I'm using a Meanwell 24V 320Watt and the Printer pulls 290Watt from AC during the heatup phase.

Re: Power consumption of MK3

I'm using a Meanwell 24V 320Watt and the Printer pulls 290Watt from AC during the heatup phase.

Does this PSU drop right in and bolt up where the stock one was, or does it require some modification?

Re: Power consumption of MK3

I'm using a Meanwell 24V 320Watt and the Printer pulls 290Watt from AC during the heatup phase.

Does this PSU drop right in and bolt up where the stock one was, or does it require some modification?

It's a very slim PSU, and doesn't fit the stock Prusa.
I used it on my Aluminum extrusion build (Haribo Prusa variant) and the STL's were available in the Haribo github.

Perhaps there are fitting mounts on thingiverse.

Re: Power consumption of MK3

Printer uses about 65Watt when printing with PLA. Occasional power spikes for a few seconds to 100Watt.
Printer uses about 45-55Watt average when printing with the heated bed off.
Printer uses about 120Watt average when printing ABS, power spikes to 180Watt.
Stock MK3 Printer pulls 240Watt from AC during heatup phase, which is not good because the PSU is rated at 240Watt. (may be a reason so many PSUs blow up)
I'm using a Meanwell 24V 320Watt and the Printer pulls 290Watt from AC during the heatup phase.

Thanks! Good to know. How much faster does everything heat up?

It's sad to hear that the stock PSU is underpowered on a machine at this price point. By using preamble gcode to heat up the heatbed first and then the extruder afterward, rather than both simultaneously, perhaps(?) we can live within the PSU limits. There's obviously a time penalty for that though. I'm sorta almost doing that already to help mitigate against extruder oozing.

Regarding the OP, I use this, but just for the Octopi: https://www.amazon.com/gp/product/B00NTQYUA8/ref=oh_aui_search_detailpage?ie=UTF8&psc=1
I think it's a good deal for <$25 delivered. You get surge protection too, and you can power the Octopi directly from its built-in USB connector. At least so far, I haven't worried about the Prusa, since it has built-in power panic.

Re: Power consumption of MK3

How much faster does everything heat up?

Hah! I haven't actually measured the time yet. Will do and report back, thanks for the reminder.

I'm using 24.5Volt, because the new 40Watt heater cartridges can only pull 35-37 watt with 24Volt (old style E3D pulled 42Watt at 24V), so upping the PSU voltage slightly gives me 40 watts on the heater cartridge.
New style heater block looks sawed off/polished, old style looks dented in at the end.

By using preamble gcode to heat up the heatbed first and then the extruder afterward, rather than both simultaneously, perhaps(?) we can live within the PSU limits.

Cura start gcode does that, i find it quite annoying. They did this because the PSUs on the Ultimakers are super under dimensioned.
Can be switched off, but then the Ultimaker PSUs will die left and right, or the electronics will restart.

Saving 40 watt from the Extruder cartridge can help letting the MK3 PSU live longer i suppose.
Bed will regardlessly pull 200-220 watt alone.

Disconnecting the heating elements and measuring them via a multimeter gives you the exact wattage they pull via Ohm's law ( http://www.sengpielaudio.com/Rechner-ohm.htm )

I'm sorta almost doing that already to help mitigate against extruder oozing.

Use this start gcode for against oozing, works wonders

M115 U3.2.1 ; tell printer latest fw version
M201 X1000 Y1000 Z200 E5000 ; sets maximum accelerations, mm/sec^2
M203 X200 Y200 Z12 E120 ; sets maximum feedrates, mm/sec
M204 S1250 T1250 ; sets acceleration (S) and retract acceleration (T)
M205 X10 Y10 Z0.4 E2.5 ; sets the jerk limits, mm/sec
M205 S0 T0 ; sets the minimum extruding and travel feed rate, mm/sec
M83 ; extruder relative mode
M104 S160 ; set extruder temp
M140 S[first_layer_bed_temperature] ; set bed temp
M190 S[first_layer_bed_temperature] ; wait for bed temp
M109 S160 ; wait for extruder temp
G28 W ; home all without mesh bed level
G80 ; mesh bed leveling
G1 Z20.0 ; Move up before heating to temp
G1 Y-3.0 F1000.0 ; go outside print area
M104 S[first_layer_temperature] ; set extruder temp
M109 S[first_layer_temperature] ; wait for extruder temp
G1 Z[first_layer_height] ; Lower to print first layer
G92 E0.0
G1 X60.0 E9.0 F1000.0 ; intro line
G1 X100.0 E12.5 F1000.0 ; intro line
G92 E0.0
M221 S{if layer_height==0.05}100{else}95{endif}


Re: Power consumption of MK3

How much faster does everything heat up?

Ok, timed the heat phase now.

Starting from 25 degrees cold, and with no plate above the heated bed, both heaters started at the same time:
Prusa MK52 Bed: 25C to 60C : 88 seconds
E3D Volcano Hotend: 25C to 220C: 113 seconds

Re: Power consumption of MK3

Oups i forgot to tell tou that it is 220V in Europe (not 110V as in USA).
So PSU well work because larger power.
I can see the Watt on my Back-UPS APC.

Re: Power consumption of MK3

Use this start gcode for against oozing, works wonders

M115 U3.2.1 ; tell printer latest fw version
M201 X1000 Y1000 Z200 E5000 ; sets maximum accelerations, mm/sec^2
M203 X200 Y200 Z12 E120 ; sets maximum feedrates, mm/sec
M204 S1250 T1250 ; sets acceleration (S) and retract acceleration (T)
M205 X10 Y10 Z0.4 E2.5 ; sets the jerk limits, mm/sec
M205 S0 T0 ; sets the minimum extruding and travel feed rate, mm/sec
M83 ; extruder relative mode
M104 S160 ; set extruder temp
M140 S[first_layer_bed_temperature] ; set bed temp
M190 S[first_layer_bed_temperature] ; wait for bed temp
M109 S160 ; wait for extruder temp
G28 W ; home all without mesh bed level
G80 ; mesh bed leveling
G1 Z20.0 ; Move up before heating to temp
G1 Y-3.0 F1000.0 ; go outside print area
M104 S[first_layer_temperature] ; set extruder temp
M109 S[first_layer_temperature] ; wait for extruder temp
G1 Z[first_layer_height] ; Lower to print first layer
G92 E0.0
G1 X60.0 E9.0 F1000.0 ; intro line
G1 X100.0 E12.5 F1000.0 ; intro line
G92 E0.0
M221 S{if layer_height==0.05}100{else}95{endif}


Thank you! I especially like that it does the bed leveling *before* the final raise of the hot end temperature to its target temp. That way, it starts to print immediately after reaching the target temp, thereby minimizing oozing. Perfect! A+