Hi All
I’ve just built a heated chamber around my home brewed printer. I thought I’d share the config here for reference purposes and for also comments before I actually switch it on, in case I can improve/tweak anything. I have a 400w ceramic heater switched by a solid state relay, and controlled by a semitec (E3D) thermistor. Here’s the config. Please feel free to comment. I’ll be testing this in a couple of days:
temperature_control.chamber.enable true #
temperature_control.chamber.thermistor_pin 0.26 #
temperature_control.chamber.heater_pin 2.6 #
temperature_control.chamber.pwm_frequency 5 # Set low to control SSR
temperature_control.chamber.thermistor Semitec # see smoothie site for details
#temperature_control.chamber.beta 4300 # or set the beta value
temperature_control.chamber.set_m_code 141 #
temperature_control.chamber.set_and_wait_m_code 191 #
temperature_control.chamber.designator C #
temperature_control.chamber.bang_bang true # set to true to use bang bang control rather than PID
temperature_control.chamber.hysteresis 2.0 # set to the temperature in degrees C to use as hysteresis
Imported from wikidot
I’m right behind you and will follow with interest.
Cheers. Hopefully I’ll be able to provide useful info to the group. 
Well the M141 S50 command works like a charm, until I try and run a print, that is.
As soon as I run the print from the SD card the temperature keeps on rising despite being set to 50 Degrees C.
The Gcode contains the correct commands, so any ideas why it’s not working?
; generated by Slic3r 1.2.9 on 2015-07-07 at 20:51:16
; external perimeters extrusion width = 0.40mm
; perimeters extrusion width = 0.67mm
; infill extrusion width = 0.67mm
; solid infill extrusion width = 0.67mm
; top infill extrusion width = 0.67mm
; support material extrusion width = 0.40mm
M190 S90 ; set bed temperature
M104 S240 ; set temperature
M141 s50 ; set chamber
G28 ; home all axes
G1 Z5 F5000 ; lift nozzle
M141 S50 ;heat chamber
M109 S240 ; wait for temperature to be reached
G21 ; set units to millimeters
G90 ; use absolute coordinates
M82 ; use absolute distances for extrusion
G92 E0
M106 S255
G1 Z0.300 F7800.000
G1 X170.310 Y108.992 F7800.000
The M105 command returns:
T:240.3 /240.0 @74 B:89.8 /90.0 @62 C:70.9 /50.0 @0
I changed the config to use thermistor input 3 instead of 4 and pin 1.22 instead of 2.6 and that seems to have fixed the problem. I have a print running at the moment and the temperature is a reasonably steady 50 degrees. 
:
temperature_control.chamber.enable true #
temperature_control.chamber.thermistor_pin 0.25 #
temperature_control.chamber.heater_pin 1.22 #
temperature_control.chamber.pwm_frequency 5 # Set low to control SSR
#temperature_control.chamber.thermistor Semitec #
temperature_control.chamber.beta 4267 # or set the beta value
temperature_control.chamber.set_m_code 141 #
temperature_control.chamber.set_and_wait_m_code 191 #
temperature_control.chamber.designator C #
#temperature_control.chamber.bang_bang false # set to true to use bang bang control rather than PID
#temperature_control.chamber.hysteresis 2.0 # set to the temperature in degrees C to use as hysteresis
I’ve tried the M191 command instead, but with the same result:
Any ideas what’s wrong?
I changed the config to use thermistor input 3 instead of 4 and pin 1.22 instead of 2.6 and that seems to have fixed the problem. I have a print running at the moment and the temperature is a reasonably steady 50 degrees.
:
temperature_control.chamber.enable true #
temperature_control.chamber.thermistor_pin 0.25 #
temperature_control.chamber.heater_pin 1.22 #
temperature_control.chamber.pwm_frequency 5 # Set low to control SSR
#temperature_control.chamber.thermistor Semitec #
temperature_control.chamber.beta 4267 # or set the beta value
temperature_control.chamber.set_m_code 141 #
temperature_control.chamber.set_and_wait_m_code 191 #
temperature_control.chamber.designator C #
#temperature_control.chamber.bang_bang false # set to true to use bang bang control rather than PID
#temperature_control.chamber.hysteresis 2.0 # set to the temperature in degrees C to use as hysteresis
I’m using a very slow speed initially (40mm/s) as I’m not sure how the X and extruder steppers will cope with the heat. They seem ok with the 50 Degrees I’m running at for the test, but I’m not sure if I need to up the heat to 70-80 degrees for ABS. Does anyone have any advice on the temperature I should use? I’m printing big parts - 300x300x280mm.
So the print’s been running all night. I sneaked a peek this morning and all looked good. I’m going to have to fit a perspex door onto the case so I don’t ruin a print by peeking.
Thanks to Arthur for his support in getting this working, and for smoothie in general -such an improvement on the Ramps I started with.
I can’t publish pictures, it seems.
I have some shots of the printer, and will soon have some pictures of the results of the heated chamber.
Can I post pics please?
Email the URLs or pictures to wolf.arthur@gmail.com and I’ll post them here.
I’ve sent a couple of shots of the chamber. The inside view and how it looks when closed, plus a print with & without the heated chamber.