There are some great YouTube videos that show how to do it. Installation instructions are pretty sparse on the web. So I ordered a Big Tree Tech SKR v 1.3 motherboard, a Big Tree Tech TFT 28 touch screen display, 5 Big Tree Tech TMC 2208 v3.0 UART stepper drivers, and a Biqu Smart Filament Detector. Easy ability to make on-the-fly temperature and speed adjustment. And thought about some of the neat features that are available on other 3D printers. I ordered a replacement motherboard from Tronxy. And they both read Max Temp when plugged into the hot bed thermistor plug. Whether this is the exact case or not, both the hot end and the heated bed thermistors read properly when plugged into the hot end themistor plug. I believe it was due to one of the thermistor wires on the heatbed coming loose and touching the 12V supply line on the heated bed, which destroyed the hot bed A/D converter on the Melzi board. Well, I just had my printer set up so it was printing reliably each and every time. With the procedure below followed, I can easily run 100C on the bed and 240C on the extruder. So I decided to autotune both the bed and the hotend. The hotend also heated up much more rapidly than it had in the past. With the new power supply wired up, the bed easily and quickly heated up to 100C. I haven't yet worked out the mounting issues, but I think I just need to get the right holes in the base and make sure I cut a new fan outlet in the top cover. This power supply is physically a little bit larger than the 12V, 240W supply provided by Tronxy, but it fits in the power supply holder. Some internet searchingfor under showed me that I could get a 12V, 30A (360 W) power supply for under $20 ( ) if you are interested).

So it was pretty obvious to me that I was running the power supply at its maximum capacity. With the heater off, the output was 13.4 V.

The highest I could get was 10.7 V with the heater on. So I adjusted the Vout using the trim pot on the power supply. So I checked the output of the power supply, thinking I might have some high resistance in the wiring. I thought there might be a problem with the wiring, so I checked the voltage to the hotbed while it was heating. I could only get my bed up to about 80C, even when I let it heat up for an hour or so.

The web tells me I need a bed temperature of 100C for printing ABS. I was trying to print ABS, but I couldn't get good bed adhesion.

Tronxy x5sa pro marlin