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Stretch PrusaAir 10 inch print

by REOCON, published

Stretch PrusaAir 10 inch print by REOCON Jan 13, 2013
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Modified Stretched PrusaAir Reprap with custom .5mm 10 watt therminator hot end. 10 Inch high prints.


Pending drawing for vertical aluminum supports and hardware.

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How do you get a 10W extruder up to extrusion temperature? On a cold day, I have trouble fully heating a 20W hot end.

If your total resistance is at 6-5 ohms then you should get 2 to 2.4 ohms. Voltage divided by resistance will give you amps. I have 2- 12 ohm 5 watt resisters in parallel that divides the resistance and gives me a total resistance of 6 ohms. That gets me about 2 amps and it heats really well. I suppose if you want more heat then drop your resistance down and you will get more amps/power. Be careful not to over drive the hotend power transistor on the board. let me know if that helps.

As I suspected, you're not running a 10W heater. You're running a 24W heater. W = V * A, so if you have 2A on a 12V source, that's 24W. The wattage rating on the resistor doesn't tell you how many watts you'll get through it, it tells you how much wattage it is designed to dissipate as heat. You are running the resistors at 2.4x their rating, and if not for the aluminum block to carry the heat away, they would burn out.

Right, if we did not overheat the resister tolerance than the heat would not bleed off. tot he brass block So 24 watt coming off 2- 10 watt resisters is do-able.

sorry first sentance should read - If your total resistance is at 6-5 ohms then you should get 2 to 2.4 Amps.