Print starts when the extruder is cold

[kiernozekm]

Application Version

4.9.0

Platform

Linux Manjaro

Printer

Monoprice Voxel

Reproduction steps

The same STL files, on 4.8 prints well like on eralier versions, on 4.9 print starts when the bed is completely cold, same thing with an extruder. Heating doesen't start.

Startup code: M118 X15.00 Y15.00 Z0.51 T0 M140 S{material_bed_temperature} T0 M104 S{material_print_temperature} T0 M104 S0 T1 M107 G90 G28 M132 X Y Z A B G1 Z50.00 F400 G161 X Y F3300 M7 T0 M6 T0 M651 M907 X100 Y100 Z40 A100 B20 M108 T0

Actual results

Bed and extruder has indoor temp.

Expected results

Much more temp

Checklist of files to include

• [ ] Log file
• [X] Project file

Additional information & file uploads

Files from both versions

project_files.zip

[GregValiant]

M140 S{material_bed_temperature} T0 M104 S{material_print_temperature} T0 Those two commands set the temperature of the bed and hot end. They do not wait for the temperatures to be reached before running the movement and extrusion codes that follow. This results in the print starting before the machine heats up. Below you see the two added lines of M190 and M109. They are the "wait for temperature" commands. Add them to the start-up gcode (Manage Printers / Machine Settings) immediately after the M140 and M104 commands as shown. With the "Heat" commands first, the bed and the heater will start to heat up together. Some power supplies aren't capable of that. If you run into trouble you'll have to do it as "heat the bed / wait for the bed" then "Heat the hot end / wait for hot end" M140 S{material_bed_temperature} T0 ;heat the bed M104 S{material_print_temperature} T0 ;heat the hot end M190 S{material_bed_temperature} T0 ;wait for bed M109 S{material_print_temperature} T0 ;wait for hot end

Looking at the gcode files, they start out identical (other than the bed temparature). The 4.8 gcode should have had the same problem. The printer profiles in both the 4.9 and 4.8 files have the same start up gcode.

[Ghostkeeper]

Indeed, M104 and M140 don't wait for the nozzle and bed to heat up, so what you're seeing would be expected behaviour of the printer then. This is just a misunderstanding of these g-codes, so I'll close this as a user error.