MK42 bed clones finally available?

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Aziraphale
Posts: 21
Joined: Mon Aug 21, 2017 11:21 am
Location: Wiltshire, UK

Re: MK42 bed clones finally available?

Post by Aziraphale » Fri Oct 06, 2017 2:17 pm

slippyr4 wrote:
Fri Oct 06, 2017 1:13 pm
The copper wound toroid next to the yellow transformer is where the switch would be. Is there something glued in to the hole in the middle of it? hard to tell in your photos. there's lots of thermal glue there though.
Nope, nothing inside the toroid besides a heap of white gunk. I've tried digging away at some of that glue (it's not going to be subject to a lot of movement or vibration, so I'm not too concerned about that - I can always silicone or hotsnot it back in place if needed) and all I could find was the labels for the two wires that come up and disappear into the transformer. They're FL2, so just a filter. The big toroid is L1, so an inductor. No sign of any empty holes in that area where a thermal switch could be wired in, either.

That said, right next to the fan connector is an LM358 op-amp, a couple of diodes, a TO-92 "Q6" which is probably a transistor, and that green thermistor. Those together could well form a speed-control circuit for the fan, but that doesn't explain why we have no speed control on it (unless it would speed up if I took a heat gun to it!). Maybe that little circuit was just wired out of the system for some reason.

I'll try to get the 24V supply open when I stop for lunch. Hopefully that'll be more obvious!
Vertigo wrote:
Fri Oct 06, 2017 2:02 pm
I just got a tracking number for my orballo MK42. Took ~3 weeks.
Awesome :) Bit faster than mine, then! Mine was pretty much exactly 4 weeks. The UPS delivery took several more days, though - ground transport from the south-ish of Spain up to the south of England.

Aziraphale
Posts: 21
Joined: Mon Aug 21, 2017 11:21 am
Location: Wiltshire, UK

Re: MK42 bed clones finally available?

Post by Aziraphale » Fri Oct 06, 2017 3:52 pm

Aziraphale wrote:
Fri Oct 06, 2017 2:17 pm
I'll try to get the 24V supply open when I stop for lunch. Hopefully that'll be more obvious!
Lol nope, no such luck.

Here's the 24V PSU's guts. No sign of any fan control at all.

But I was thinking, couldn't I just grab one of those thermal switches and hack it to be inline with the fan? I can't see why specific circuitry on the board would be required.

Or am I wrong?

chumm
Posts: 113
Joined: Thu Jun 15, 2017 11:24 am

Re: MK42 bed clones finally available?

Post by chumm » Fri Oct 06, 2017 11:05 pm

Aziraphale wrote:
Fri Oct 06, 2017 12:39 pm
If it's for a hotend heatsink cooling fan, e.g. to replace the E3D v6 fan, you're probably better off looking for a 40mm-to-30mm fan adapter model to print, then getting a 24V 40mm fan which are also very common. I'll probably end up swapping to a quiet 40mm fan for my hotend soon, but right now the PSU is by far the top priority!
Thanks, that's a good idea and a good resource. The 30mm fans I've found are really loud and pretty uncommon at 24v, I'll try out one of these 40mms.

Monkeh
Posts: 10
Joined: Fri Sep 29, 2017 11:56 pm

Re: MK42 bed clones finally available?

Post by Monkeh » Sat Oct 07, 2017 12:17 am

You could also just arrange a 12V supply for the fans. Buck converters aren't pricy.

slippyr4
Posts: 109
Joined: Thu Jun 15, 2017 10:24 am

Re: MK42 bed clones finally available?

Post by slippyr4 » Sat Oct 07, 2017 10:26 am

Aziraphale wrote:
Fri Oct 06, 2017 3:52 pm

But I was thinking, couldn't I just grab one of those thermal switches and hack it to be inline with the fan? I can't see why specific circuitry on the board would be required.

Or am I wrong?
Yes. From memory, that’s all the jumper was on my PSU board.
Self-built Prusa i3 MK2 clone
My things: https://www.thingiverse.com/slippyr4/designs
My Prusa firmware port for ramps & MKS : https://github.com/slippyr4/Prusa-Firmware

Aziraphale
Posts: 21
Joined: Mon Aug 21, 2017 11:21 am
Location: Wiltshire, UK

Re: MK42 bed clones finally available?

Post by Aziraphale » Sat Oct 07, 2017 11:19 am

slippyr4 wrote:
Sat Oct 07, 2017 10:26 am
Yes. From memory, that’s all the jumper was on my PSU board.
Awesome, thanks :) I'll give that a go when the parts arrive and I'll report back!

Arriving today from Amazon I have:
  • A 40x10mm Noctua 12V fan for my hotend once I print an adapter
  • A 60x25mm Noctua 12V fan for this 24V PSU (I'll grab a buck converter from my stash)
  • A Gelid Silent 60x15mm 12V fan for my 12V PSU (which has less space available for fan thickness, and Noctua don't do thin enough 60mm fans)
  • Six KSD9700 40°C NO temperature switches
So I should soon have some lovely quiet fans set up :)

Edit: Of course, eventually I'll be getting either an E3D watercooling setup on my existing v6, or getting a watercooled Cyclops or Chimera (not decided which yet), since my enclosure can hit 50°C on long ABS prints, but I'm looking at £200 or so for the latter options and I'm quite broke at the moment, so a cheap, quiet 40mm hotend fan is a reasonable starting point. I've not yet had any issues cooling my hotend in the enclosure so far (touch wood...) so watercooling isn't super high on my priority list.

Vertigo
Posts: 18
Joined: Mon Jul 31, 2017 9:00 am

Re: MK42 bed clones finally available?

Post by Vertigo » Mon Oct 09, 2017 11:22 pm

Vertigo wrote:
Fri Oct 06, 2017 2:02 pm
I just got a tracking number for my orballo MK42. Took ~3 weeks.
I should have been more explicit. I did get a tracking number last week, but they still havent shipped. Damn these guys are slow. Not going to order there again, thats for sure.

Moorviper
Posts: 50
Joined: Wed May 24, 2017 1:19 pm

Re: MK42 bed clones finally available?

Post by Moorviper » Wed Oct 11, 2017 11:18 am

Joachim Jacobsen is slower ;-)

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3dvs_ch
Posts: 10
Joined: Mon Sep 25, 2017 11:00 pm

Re: MK42 bed clones finally available?

Post by 3dvs_ch » Wed Oct 11, 2017 2:46 pm


Vertigo
Posts: 18
Joined: Mon Jul 31, 2017 9:00 am

Re: MK42 bed clones finally available?

Post by Vertigo » Thu Oct 12, 2017 11:00 am

My Orballo Mk42 finally arrived. Mounting will have to wait until the weekend, but it looks ok. I measure 1.1 Ohm. No led/resistor installed or supplied.

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