310 heated bed, 220V aluminum substrate heating, 3D printing /tt/gugubot

This is suitable for modifying 310 heated beds (240mm hole spacing), such as DIY 3D printers like those from Gugubot, Dayu TT, and Dayu CC. These printers, in order to control costs, all use 24V DC heated beds, resulting in very slow temperature rise, which can be quite frustrating for impatient users. 220V silicone heating pads truly offer superior heating performance; this open-source aluminum substrate heating pad completely outperforms silicone heating pads.
 
Each aluminum substrate has a trace length of 9.2m and a thickness of 0.035mm (1 ounce). Nine aluminum substrates are connected in series to a 220V power supply. Theoretical and measured power: [


Table showing trace width , resistance
per substrate,
theoretical power (9 substrates in
series), measured power (9 substrates in series)]


0.5mm
10 ohms
584
541


0.6mm
7.7 ohms
701
649


0.65mm
6.7 ohms
759
703


0.7mm
6.3 ohms
818
757


 
 
All nine substrates must be connected in series and properly insulated before connecting to the 220V power supply.
The connection method is shown in the diagram below. Ensure proper insulation and cover exposed solder joints with thermally conductive silicone (two tubes are sufficient).
Similarly, use thermally conductive silicone to attach the aluminum substrates and heated bed to the positions shown in the diagram below. (The heated bed can be a previous 24V heated bed, or you can buy a 310*310*8 aluminum plate and drill 240*240mm holes yourself; the cost is around 70).
The PCB includes pads for a 100k thermistor, allowing direct soldering of a 0603 thermistor
for 220V connection. This can be connected in series with a normally closed 120°C temperature switch to prevent overheating and potential fires.
 
Tested and proven stable and reliable with impressive temperature rise. 0.6mm trace width is recommended (this is the default PCB and PCB design file). Two types of PCBs are available; you can get 5 of each for free (the ones with screw holes are convenient for mounting on a heated bed).
**Important:** Ensure proper insulation and implement leakage protection measures!