I am close to having my machine running properly with a Max6675 thermocouple module and a TinyOLED display controller with micro SD card. I am running with RAMPS 1.4. To get the Max6675 working without bootup errors, I have loaded the latest development version of Marlin. All now works as it should except that whenever I am printing from the SD card, the printer freezes mid print. When I print from the computer (not using the SD), it prints fine without freezing. I have trawled thru everything I can find about SPI conflicts between SD and MAX6675 but haven't come across the answer yet. Has anyone else cracked this nut yet? If I can't solve it soon, I will switch back to a thermister. I had the same issue with the reprepdiscount graphics smart controller too, so it is not specific to the TinyOLED setup. https://reprap.org/forum/read.php?146,523844,523844#msg-523844 Wed, 16 Sep 2026 20:58:03 -0400 Phorum 5.2.23 https://reprap.org/forum/read.php?146,523844,523844#msg-523844 https://reprap.org/forum/read.php?146,523844,523844#msg-523844 Max6675 thermocouple module and a TinyOLED display controller with micro SD card. I am running with RAMPS 1.4.

To get the Max6675 working without bootup errors, I have loaded the latest development version of Marlin. All now works as it should except that whenever I am printing from the SD card, the printer freezes mid print. When I print from the computer (not using the SD), it prints fine without freezing. I have trawled thru everything I can find about SPI conflicts between SD and MAX6675 but haven't come across the answer yet. Has anyone else cracked this nut yet?

If I can't solve it soon, I will switch back to a thermister. I had the same issue with the reprepdiscount graphics smart controller too, so it is not specific to the TinyOLED setup.]]> n.glasson Firmware - mainstream and related support Sat, 20 Jun 2015 05:33:08 -0400