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| reprap:anet:a8:improvements:understanding_my_heatbed [2018/12/30 10:06] – [Analysis with the simulator] cj_elec_tech | reprap:anet:a8:improvements:understanding_my_heatbed [2018/12/30 10:19] (current) – [The optimal wire] cj_elec_tech |
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| * Use thicker wires between heat-bed and the board, and board and power supply (see the optimization chapter below). | * Use thicker wires between heat-bed and the board, and board and power supply (see the optimization chapter below). |
| * Solder wires directly onto the heat-bed (some soldering practice is needed). | * Solder wires directly onto the heat-bed (some soldering practice is needed). |
| * Increase the voltage of the power supply. This might be risky and is only recommended if you have [[reprap:anet:a8:replace_connectors|replaced the original connectors]]. The power supply might exceed its limits, therefore a power supply with 30A at least is recommended by some users if 14V is used. Theoretically the Arduino in the Anet board can go up to 18V but only 12V is recommended for Arduinoes. So it should be possible, but it is your own risk! | * Increase the voltage of the power supply. This might be risky and is only recommended if you have [[reprap:anet:a8:replace_connectors|replaced the original connectors]]. The power supply might exceed its limits, therefore a power supply with 30A at least is recommended by some users if 14V is used. Theoretically the Arduino in the Anet board can go up to 18V but only 12V is recommended for Arduinos. So it should be possible, but it is your own risk! |
| {{ :reprap:anet:a8:improvements:mypicture11.gif |}} | {{ :reprap:anet:a8:improvements:mypicture11.gif |}} |
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| ==== Some research in the net==== | ==== Some research on the Net==== |
| The heatbed for the A8 was increased to 220x220mm from the original Prussa i3 design with 200x200mm. Aparently the power was not not scaled accordingly. | The heat-bed for the A8 was increased to 220 x 220mm from the original Prussa i3 design (200 x 200mm). Apparently the power was not scaled accordingly. |
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| Some recomendation say you need 0.6 W/cm² for a heat bed. This would mean 290W for the A8 heat bed. But it has not even half(110W) of it. | Some recommendations say you need 0.6 W/cm² for a heat-bed. This should mean 290W for the A8 heat-bed, but the A8 is not even half that value (it's only 110W). |
| ==== The optimal wire ==== | ==== The optimal wire ==== |
| The original wires from the Anet printer are thin and therefore have an resistance which lead to an power reduction of the heat bed. If you use extremly thick wires you it will be a mechanical issue for the Y-axis stepper and as cables are made of very good thermal conductors it will remove heat from your heatbed by conduction. This rough estimation shows that AWG 9 would be an Optimum from the thermal point but the difference from an AWG 14 is minimal and AWG14 is conciderable more flexible and can be crimped with blue pre insulated crimps. Also the 1 W more for AWG16 would be ok as this as 1W would increase the max heat bed temperature by only 0.5K. | The original wires from the A8 printer are thin; therefore their resistance leads to an power reduction to the heat-bed. If you use extremely thick wires you will create extra mechanical loads for the Y-axis stepper and, as cables are made of a very good thermal conductor, thicker wires will remove heat from your heat-bed via conduction. This rough estimation shows that AWG 9 would be an Optimum from the thermal point but the difference from an AWG 14 is minimal and AWG 14 is considerably more flexible and can be crimped with blue pre-insulated crimps. Also the extra 1 Watt of power saved by using AWG16 wire would only increase the max heat-bed temperature by 0.5K. |
| I recomend silicone wires with thin strands due to their flexibility. | I recommend silicone wires with many thin strands as they are much more flexible. |
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| {{:reprap:anet:a8:improvements:optimum_cables2.jpg|}} | {{:reprap:anet:a8:improvements:optimum_cables2.jpg|}} |
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