I haven't used Marlin in ages, and never had cause to push high temps when I did, but the question came up recently.. How does Marlin handle it when an operator sets the nozzle temperature higher than where the thermistor table ends? I've seen people claiming to be running up to 325C with a glass bead stock from China printer, but when I looked into it, the thermistor tables I opened (2.0 bugfix) topped out at 300C with only the 1 Ohm/719C reading being higher. Where is the 325C reading on the screen coming from? Is Marlin extrapolating? Is Marlin setting to the 300C and just reporting 325C? Perhaps I wasn't looking at the right tables, but still would like to know how Marlin would handle this scenario. Thanks all! https://reprap.org/forum/read.php?415,868274,868274#msg-868274 Sun, 12 Jul 2026 23:11:22 -0400 Phorum 5.2.23 https://reprap.org/forum/read.php?415,868274,868290#msg-868290 https://reprap.org/forum/read.php?415,868274,868290#msg-868290 VDX Firmware - Marlin Sun, 01 Mar 2020 04:05:14 -0500 https://reprap.org/forum/read.php?415,868274,868278#msg-868278 https://reprap.org/forum/read.php?415,868274,868278#msg-868278
I was just wondering what Marlin would do if you set temp higher than the thermistor's table (assuming they've changed the max_temp).
I've seen a couple tables top out at 300, but this is the second time I've seen someone say they're printing higher without anything special.. wondered what was really happening. Does Marlin tell tall tales??]]> Diggrr Firmware - Marlin Sat, 29 Feb 2020 20:27:05 -0500 https://reprap.org/forum/read.php?415,868274,868277#msg-868277 https://reprap.org/forum/read.php?415,868274,868277#msg-868277 VDX Firmware - Marlin Sat, 29 Feb 2020 19:21:54 -0500 https://reprap.org/forum/read.php?415,868274,868275#msg-868275 https://reprap.org/forum/read.php?415,868274,868275#msg-868275
Most high temperature is done with thermocouples and maths not tables.]]> Dust Firmware - Marlin Sat, 29 Feb 2020 19:18:42 -0500 https://reprap.org/forum/read.php?415,868274,868274#msg-868274 https://reprap.org/forum/read.php?415,868274,868274#msg-868274
How does Marlin handle it when an operator sets the nozzle temperature higher than where the thermistor table ends?

I've seen people claiming to be running up to 325C with a glass bead stock from China printer, but when I looked into it, the thermistor tables I opened (2.0 bugfix) topped out at 300C with only the 1 Ohm/719C reading being higher.
Where is the 325C reading on the screen coming from?
Is Marlin extrapolating?
Is Marlin setting to the 300C and just reporting 325C?

Perhaps I wasn't looking at the right tables, but still would like to know how Marlin would handle this scenario.

Thanks all!]]> Diggrr Firmware - Marlin Sat, 29 Feb 2020 16:51:52 -0500