SyntaxTerror

Ah, I thought they might indeed be radial fans on the UM3. Just never could tell what was really going on inside the head because of all the covers hiding the inner workings. And you're right, that looks like a very nice design. Might just have to try it out.

Agreed, there's an annoying lack of specs regarding fans (airflow/pressure/etc). I've been wondering awhile whether or not there's anything to be gained by replacing the side fans with thicker ones for greater pressure. I have this sneaky suspicion that angling the airflow as aggressively as it is done on the UM2+ head assembly might severely limit the airflow due to lack of static pressure.. the fans are awfully thin after all so I can't imagine they produce much. Then again I'm not that sort of engineer, and airflow is a surprising thing sometimes so I can't say for sure. I'd like to try to replace them with something else, but it gets somewhat random when you don't have any specs to compare with. Regarding the PWM issue, it would be a quick modification to replace the fans with proper PWM controlled ones, as long as we have access to the PWM output and a suitable power bus. But again, with no fan specs, it would be random experimentation.

Technically speaking, none of the fans in the UM2 are PWM fans; that would require a third lead for a triggering signal. The UM2 runs ordinary DC fans as PWM fans by chopping the power input. Not all fans react equally well to this, and the PWM frequency may be the issue here.

Hi @SyntaxTerror, (I love your handle, BTW!) I am interested in taking you up on your offer. I will PM you and we can hammer out the details. Thanks very much! You are very kind! Ah, no worries. I'd love to see a video of my face as I was trying to place the order. First I put 12 in the cart. Multiples of 10 only, it said. Fine, 8 more in. Then I ran into the minimum order amount. Fine, I did a quick calculation and learned I needed 50. So 30 more in the cart. Then because of the amount of magnets, it gave me a discount that put me below the minimum again. In any case, now I have enough magnets to do this thing to 10 printers.

Well it's a bloody interesting thread, this!

Unless I'm missing something, the SD card slot listed in the BOM should be available from Mouser for immediate dispatch. P/N 798-DM1B-DSF-PEJ82

Minimum orders being what they are, I have overflow. If you want, I could send you a set?

Heh... sounds like those daft ebay people need to figure out what the EEC is and how customs work inside of it. I don't recall seeing the UK slamming that particular door just yet. Sounds like a fairly useless service they've introduced there.

Cheers Will, Sounds good you're willing to ship internationally - I think something's up with your auction settings though. I'm reading: Postage to: United Kingdom, Bangladesh, Bermuda, Bolivia, Barbados, Brunei Darussalam, Cayman Islands, Ecuador, Egypt, Guernsey, Gibraltar, Guadeloupe, French Guiana, Iceland, Jersey, Jordan, Cambodia, Liechtenstein, Sri Lanka, Macau, Monaco, Maldives, Martinique, Nicaragua, Oman, Pakistan, Peru, Paraguay, Reunion ...which kind of seems like a rather random selection of odd locations around the globe?

If you find a box for it, I might well be interested.

For future reference the connectors can be ordered from Mouser - P/N: 581-009155005003016 Haven't heard of a place they don't ship to yet.

Oh, crap. Disregard that. I missed the part with the school snatching them. Bastards

Well, if nobody else wants to...? If you're willing to ship to Denmark, I'm certainly interested in one. What sort of payment is acceptable? Paypal?

Teasing? Now that's just plain mean Fine. I guess I'll just go print some single-material things then.