calibrating temp question is there a calculator that can generate a new temp table if i know what the difference is between how hot the printer thinks it is and how hot it actually is? when i set my printer nozzle to 185 the actual temp is 164 I am measuring actual temps with a extech EX330 multimeter with a type k thermocouple. i think my thermisistors are 100k but they were in a junk drawer so i really have no clue what they are. also interested in doing this with my heated bed but i want to calibrate on the surface of the glass (it will be off in terms of the correct temp displayed but i am ok with that) the thermisistor is on the bottom of the pcb. the bed will be hotter than the surface but i would like to make it so when the surface reaches 125 then the heater shuts off. anything out there that will do this? I could jsut figure it out and put in wildly different numbers to get the desired results but it would be nice if it were calibrated. i am using ramps 1.2, teacup firmware and a nichrome makergear hot end with standard prusa hbp. thanks t https://reprap.org/forum/read.php?146,133924,133924#msg-133924 Mon, 16 Mar 2026 18:08:04 -0400 Phorum 5.2.23 https://reprap.org/forum/read.php?146,133924,134163#msg-134163 Re: calibrating temp question https://reprap.org/forum/read.php?146,133924,134163#msg-134163 Traumflug Firmware - mainstream and related support Wed, 23 May 2012 05:41:13 -0400 https://reprap.org/forum/read.php?146,133924,134049#msg-134049 Re: calibrating temp question https://reprap.org/forum/read.php?146,133924,134049#msg-134049
thats a bummer, its really amazing how hard it is to get one of these machines running properly.]]> zg_bot Firmware - mainstream and related support Tue, 22 May 2012 15:38:00 -0400 https://reprap.org/forum/read.php?146,133924,133963#msg-133963 Re: calibrating temp question https://reprap.org/forum/read.php?146,133924,133963#msg-133963
Quote

i think my thermisistors are 100k but they were in a junk drawer so i really have no clue what they are.

Measure them? At 25°C you can measure the reference resistance with a simple ohms meter.

Quote

teacup firmware

Look into ThermistorTable.double.h. There's a description on how to get accurate measurements. Some 15 value pairs should be sufficient, though; the currently 102 pairs there are simply a memory and processing time waste.]]> Traumflug Firmware - mainstream and related support Tue, 22 May 2012 05:12:24 -0400 https://reprap.org/forum/read.php?146,133924,133924#msg-133924 calibrating temp question https://reprap.org/forum/read.php?146,133924,133924#msg-133924
when i set my printer nozzle to 185 the actual temp is 164 I am measuring actual temps with a extech EX330 multimeter with a type k thermocouple.

i think my thermisistors are 100k but they were in a junk drawer so i really have no clue what they are.

also interested in doing this with my heated bed but i want to calibrate on the surface of the glass (it will be off in terms of the correct temp displayed but i am ok with that) the thermisistor is on the bottom of the pcb. the bed will be hotter than the surface but i would like to make it so when the surface reaches 125 then the heater shuts off.

anything out there that will do this? I could jsut figure it out and put in wildly different numbers to get the desired results but it would be nice if it were calibrated.

i am using ramps 1.2, teacup firmware and a nichrome makergear hot end with standard prusa hbp.

thanks
t]]> zg_bot Firmware - mainstream and related support Mon, 21 May 2012 20:46:44 -0400