Welcome to the SeeMeCNC Community

All,

I bought a Rostock Max V2 about 2 weeks ago. Got it together in a couple of days. I love this machine! I'm really enjoying learning the ins and outs of 3D printing.

So a few days after I got it together, I downloaded an STL that was about a 7 hour print. I went out to dinner, and when I got back the machine had turned off. The power switch was still in the on position, but there was no power going to the machine. When I flipped the switch off and then on again, it came right back up. I had the heated bed up to 100 and the extruder at 220, BTW.

So I read about this problem on these forums (huge asset), and it seems other people have had this problem. It's an overheating power supply. I sent an email to SeeMeCNC at 11:48PM telling them about the problem. I heard back from JJ at 7:39AM the next day. I'm thinking, "man, these guys are responsive!" He asked for a copy of my invoice (I bought the machine from MatterHackers) and a picture of the PSU so he could send me a new one.

I got home from work and sent him the requested info at 7:42PM. I got an email back at 7:08AM the next day that they shipped out a new PSU.

First, let me say how awesome this customer service is! SeeMeCNC took responsibility for this problem, took my word for what was happening, and sent me a new PSU at no cost to me. I couldn't ask for anything more.

While I was waiting for the new PSU to arrive, I ordered a couple of fans off of Amazon and installed them into the side panels of the Rostock. Now the machine does not overheat. But I also noticed that it sure does take a long time for the bed to heat up. Over 20 minutes to get to 90C. At least an hour to get to 100C. These times were unchanged from before I installed the fans, BTW. So I got out my multimeter and measured the voltages at the input to the RAMBo and the output to the bed. 11.2V from the PSU to the RAMBo and 10.99V from the RAMBo to the bed.

Today I received my new PSU from SeeMeCNC. Instead of a Viotek 600 that I had before, I received a Viotek 450. I don't quite understand why a 450 would work better than a 600, but I figure SeeMeCNC has their reasons. I figure this is as good a time as any to upgrade my PSU, so I went to MicroCenter and bought a Corsair CX750M rather than screw around with another Viotek.

I found an old computer (1998) and pulled the connector off of the motherboard so that I can wire up the on/off switch without cutting the wires off the motherboard connector of my new PSU. What I'm not sure about is: how do I go about connecting the RAMBo to this PSU? I don't mind cutting the modular cables because I can order replacements later if I want to, but I don't want to cut the CPU power cable on the PSU because it's hard-wired.

SeeMeCNC or someone else who has switched out their PSU please tell me how to connect this up! I appreciate your help!

Thank you,
Darren

I bought extension cables from amazon and cut those instead. A 24 pin atx extension was $6, and 4 pin Molex extensions are a dollar or two each.

If you are looking to avoid cutting into the power supply, it's worth the 10 bucks or so.

I'm not sure why you're asking how to connect the psu to the Rambo? You obviously did it once before, right?

I figured it out. The problem was that the cables supplied with the psu are all black - no color coding. I found a diagram on the Internet of how the cables are wired and then tested them with my multimeter. I've now put it back into my Rostock. The voltage at the RAMBo is now 12V instead of 11.2V. It takes 14.5 minutes to get to 90C instead of 20.5. Good times!

Darren

Good to hear! My cheapie power supply is also only putting out ~11v at full power and takes forever to get to 90C. I am considering getting a designated 12v supply for the machine.

Jon

I would definitely upgrade the PSU. It was a simple swap once I figured out which wires were positive and which were negative. Plus, I didn't do any damage to the power supply's hardwired cables. The hole in the bottom of the Rostock Max V2 makes it very easy.

Darren