New hot end board: pre-order yours now! May 30, 2014 09:35AM |
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Re: New hot end board: pre-order yours now! May 30, 2014 01:24PM |
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Re: New hot end board: pre-order yours now! May 30, 2014 02:14PM |
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Re: New hot end board: pre-order yours now! May 30, 2014 02:47PM |
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Re: New hot end board: pre-order yours now! May 30, 2014 02:59PM |
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Quote
dc42
The printed parts needed are:
1. Modified heatsink duct, or modified version of Matt's one-piece heatsink/fan duct....
Re: New hot end board: pre-order yours now! May 30, 2014 06:41PM |
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Re: New hot end board: pre-order yours now! May 31, 2014 04:56AM |
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Re: New hot end board: pre-order yours now! June 01, 2014 05:09AM |
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Re: New hot end board: pre-order yours now! June 03, 2014 03:17PM |
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Re: New hot end board: pre-order yours now! June 10, 2014 08:03AM |
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Re: New hot end board: pre-order yours now! June 11, 2014 09:04AM |
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Re: New hot end board: pre-order yours now! June 11, 2014 10:21AM |
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Re: New hot end board: pre-order yours now! June 12, 2014 12:18PM |
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Quote
dc42
Hi Les,
I'm getting the PCBs made by Itead in HK and the boards assembled by Castle Technologies in Stranraer.
Yes the attiny44a is SMD. The board includes pads for a standard 6-pin Atmel ICSP header, but I don't populate it because it would increase the height of the board too much. Instead, I use a programmer attachment with 6 spring-loaded probes that I press on to those pads.
Re: New hot end board: pre-order yours now! June 12, 2014 12:44PM |
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Re: New hot end board: pre-order yours now! June 12, 2014 01:07PM |
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Re: New hot end board: pre-order yours now! June 13, 2014 08:06AM |
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Re: New hot end board: pre-order yours now! June 13, 2014 09:03AM |
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Re: New hot end board: pre-order yours now! June 14, 2014 09:21AM |
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Quote
dc42
First I would caution against using a single PWM fan. The heatsink needs to be cooled whenever the hot end is hot. So if you want to control the fan speed then I suggest you use one on/off fan to cool the heatsink, and a separate PWM fan to cool the print.
Quote
dc42
However, if you want to then you can bypass the fan control on my board by soldering a 0 ohm 0603 resistor or a wire link across the pads provided for this purpose.
Regarding use at a bed temperature of 120C, the IR emitter and phototransistor at the bottom of the board are rated at 85C. There is also a capacitor at the bottom of the board, rated at 105C. If the bed thermistor is reading 120C then I think you will find that the bed surface is at more like 105C. I think it would be advisable to provide cooling for the IR emitters and phototransistor, perhaps by drilling a small hole in the heatsink duct.
Re: New hot end board: pre-order yours now! June 14, 2014 10:11AM |
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Quote
zombiepantslol
There is absolutely no problem using a 4-pin PWM fan for the hotend cooling. As per Intel's specifications, all 4-pin PWM fans will run at somewhere near 35% if the PWM line is pulled low or the duty cycle decreases to less than 30%. In fact, this limitation even makes them idiot-proof and allows me to utilize the M106/M107 commands quite nicely.
Re: New hot end board: pre-order yours now! June 14, 2014 10:42AM |
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Re: New hot end board: pre-order yours now! June 19, 2014 09:30AM |
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Re: New hot end board: shipping from 1 July! June 24, 2014 06:17AM |
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UK inc VAT EU VAT paid Europe no VAT Outside Europe Bare PCB £7.35 £8.48 £7.07 £7.82 Full kit £54.63 £62.89 £52.41 £53.50 Upgrade kit £47.56 £55.75 £46.46 £47.52