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The printer was working fine yesterday, though I edited some gcode on a part file while attempting to print using exclusively the secondary head.

As of today I am unable to communicate any commands via the touch screen panel or through Cura.

This includes movements, LED on/off, preheating, and extruding.

I’ve taken a look at the electrical components using a multimeter to check for continuity, and everything seems to be in order.

I did upload an edited arduino sketch, though all I edited there was the Z offset, so its unlikely that the issue is there. I’ve reuploaded Marlin multiple times with no such success.

Any tips here?

Thanks in advance.

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Flash the display using the sd card with the files from manufacturer fixed it for me

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Change the connection settings on the LCD to 115000. It might have changed to 256000.

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Hi there. Im totally new to 3D printing. I figured I would buy and all in 1 so I wouldnt have to change machines and or upgrade as I go. So I bought this T-rex 2. I was able to print test squars and came to pretty good quilty with the PLA they suppled. I was looking into different fillament and bought PELG and was concern about the tip temp only going to 220. PELG needs at least 235, 240 is recommended. But It wont heat up to that so it wont print. Any thoughts?

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I can guess of two reasons only for this issue. First may be in the marlin firmware the max temp is defined as 220.

Secondly wait for some more time as sometimes my printer also stays at 220 for a while and then goes above it.

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Would it hurt anything if I changed the marlin to 250 or 260?

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I think you can change it to 260 without any risks in the marlin. The printing temperature you can control with the slicer software.

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Hey sorry to keep bothering you. I tried hunting it down for max temp but it says its 350. So I notices that if I slow down the fan for the extruder with my finger it heats up to 240 no problem. But once I let go it cools it down to 220 and stays theres. Is there a way to slow down that front fan?

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That’s a good observation. It’s better to contact formbot directly. Their support is excellent especially the lady Ada Fang.

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I added aluminum foil tape to the bottom of the fan to go over the heater block. Made like a wind block for it. Now it has no problem heating up. Heats to 205 and 240 with no delay. Thank you for your help and your right Ada is very helpful too.

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Glad to hear that. Happy printing.

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