Welcome to the SeeMeCNC Community

Hi, Walter 'n Evan here
Got a Rostock Max kit for christmas,
It's assembeled, but only got 1 thermister, put it on the hotend (none on the Phebe1 hotbed), so need to get.

Our setup:
Rambo board
Dell Windows XP laptop
Loaded RAMBo USBdriver.zip - OK Com 4!
Loaded Reptier Host and tried M119 Manual Control - Worked great!
Tried G28 - Wrong Direction!.

Decided to edit firmware to fix it *My Comments & Notes in Brackets []*

Loaded arduino IDE v22 (after trying latest, it did not work, will not open) V22 works! Loads OK

Loaded firmware from github - johnoly99/Marlin-for-rostockmax-rambo
(opened with Gizmo) [confusing if you don't find Open With!]

copy Marlin\sanguino <arduino home>\hardware\Sanguino [OK!]

Next we did: [following conflicting instructions [vs the assembly guide P 80] on the readme included from github - johnoly99/Marlin-for-rostockmax-rambo]

1) For gen6 and sanguinololu the Sanguino directory in the Marlin dir needs to be copied to the arduino environment.
copy Marlin\sanguino <arduino home>\hardware\Sanguino [OK!]

2) Install Ultimaker's RepG 25 build
http://software.ultimaker.com [Why? What do I do with it? Where do I put it?] I downloaded it..........

3) Copy the Ultimaker Marlin firmware https://github.com/ErikZalm/Marlin/tree/Marlin_v1
(Use the download button) [found a zip file, Why? What do I do with it? Where do I put it?] I downloaded it..........

4) Start the arduino IDE. [OK!] Select Tools -> Board -> Arduino Mega 2560 or your microcontroller [I don't see RAMBo]!
Select the correct serial port in Tools ->Serial Port:4 [OK]

5) Open Marlin.pde [from where? I now have 2...... Used the one in Marlin-for-rostockmax-rambo]

6) Click the Verify/Compile button, [OK!] Click the Upload button [OK! yellow light flashes, works]
If all goes well the firmware is uploading

7) Now following page 80 from the Rostock Max Assy Guide: Use Repetier.com, run Host [what version? My screens don't look like page 82! My printer shape is different!]

-> I use Manual Control "M119" - [all swiches are OK!]
-> I use G28 [very cool! it checks each sw, does a little dance, Now it's working! I'm so damn excited!]
-> I try to calibrate following instructions from page 85 and it throws the following errors when I try to do anything else!
Including G1 Z50 F1200, or trying the down Z arrow, or ??

I did recompile, reload, shut down & restart, etc.
I can get it to dependably connect and M119, G28, so I have communications.


17:22:37.468 : OpenGL version:1.4.0 - Build 7.14.10.4814
17:22:37.468 : OpenGL extensions:GL_ARB_depth_texture GL_ARB_fragment_program GL_ARB_multitexture GL_ARB_point_parameters GL_ARB_shadow GL_ARB_texture_border_clamp GL_ARB_texture_compression GL_ARB_texture_cube_map GL_ARB_texture_env_add GL_ARB_texture_env_combine GL_ARB_texture_env_dot3 GL_ARB_texture_env_crossbar GL_ARB_transpose_matrix GL_ARB_vertex_buffer_object GL_ARB_vertex_program GL_ARB_window_pos GL_EXT_abgr GL_EXT_bgra GL_EXT_blend_color GL_EXT_blend_func_separate GL_EXT_blend_minmax GL_EXT_blend_subtract GL_EXT_clip_volume_hint GL_EXT_compiled_vertex_array GL_EXT_cull_vertex GL_EXT_draw_range_elements GL_EXT_fog_coord GL_EXT_multi_draw_arrays GL_EXT_packed_pixels GL_EXT_rescale_normal GL_EXT_secondary_color GL_EXT_separate_specular_color GL_EXT_shadow_funcs GL_EXT_stencil_two_side GL_EXT_stencil_wrap GL_EXT_texture_compression_s3tc GL_EXT_texture_env_add GL_EXT_texture_env_combine GL_EXT_texture_filter_anisotropic GL_EXT_texture3D GL_3DFX_texture_compression_FXT1 GL_IBM_texture_mirrored_repeat GL_NV_blend_square GL_NV_texgen_reflection GL_SGIS_generate_mipmap GL_WIN_swap_hint
17:22:37.468 : OpenGL renderer:Intel 945GM
17:22:37.468 : Using fast VBOs for rendering is possible
17:27:57.203 : start
17:27:57.203 : echo: External Reset
17:27:57.203 : Marlin 1.0.0
17:27:57.203 : echo: Last Updated: 2012-09-21 | Author: johnoly99 and johnnyR from UltiMachine
17:27:57.203 : Compiled: Feb 10 2013
17:27:57.203 : echo: Free Memory: 1862 PlannerBufferBytes: 4928
17:27:57.203 : echo:Using Default settings:
17:27:57.421 : echo:Active Extruder: 0
17:27:57.437 : FIRMWARE_NAME:Marlin for Delta FIRMWARE_URL:https://github.com/johnoly99 MACHINE_TYPE:RostockMAX
17:27:57.453 : echo:Unknown command:"Error:0
17:27:57.453 : : Extruder switched off. MINTEMP triggered !
17:27:57.468 : Error:Printer stopped deu to errors. Fix the error and use M999 to restart!. (Temperature is reset. Set it before restarting)
17:27:57.468 : 0"
17:27:57.468 : Error:No Line Number with checksum, Last Line:3
17:27:57.468 : echo:Unknown command:"ok"
17:27:57.468 : Error:Line Number is not Last Line Number+1, Last Line:3
17:27:57.468 : Resend:4
17:27:57.468 : Error:Line Number is not Last Line Number+1, Last Line:3
17:27:57.468 : Resend:4
17:27:57.484 : Error:Line Number is not Last Line Number+1, Last Line:6
17:27:57.484 : Resend:7
17:27:57.484 : Error:Line Number is not Last Line Number+1, Last Line:7
17:27:57.484 : Resend:8
17:29:44.703 : x_max:H y_max:H z_max:H
17:31:20.015 : Printer stopped deu to errors. Fix the error and use M999 to restart!. (Temperature is reset. Set it before restarting)

This is the line that matters
17:27:57.453 : : Extruder switched off. MINTEMP triggered

It means that either the Hotend thermister is not plugged in, or the pin map is incorrect, or it's very cold where the printer is (<5C I think).

Thank you

Will it operate without a hot bed thermistor?

wross wrote:Thank you

Will it operate without a hot bed thermistor?

Yes, if you switch it off in the firmware. Otherwise, you get exactly the error you reported.

You need to find the following line in configuration.h:
#define TEMP_SENSOR_BED 5
... and set it to 0 like the two lines above (temp sensors 1 and 2), which set temperature sensors for second and third extruders (0 being used for your primary extruder).

Do you know what the resistance across the thermistor should be? I'm getting the same problem except that both thermistors are present and were reporting correctly but are now being silly. In between I took apart the hot end and bed assemblies and reassembled them.

When I run a multimeter across them thermistors I get values of 115 - 120K at about 18 - 20 deg C

Should be about 100K at room temperature, there are two possibilities, either you have a short somewhere, which is causing the temperature to read incorrectly, or you had a short and fried the input on the RAMPS board, if you have a 100K resistor you can put it in in place of the thermistor and see if you get a reasonable reading, a 10K resistor is also OK it'll show a temperature in the 150-200 range.
If the inputs are damaged, you can use the other thermistor inputs, by changing pins.h in the firmware, but I would not plug the heaters in to the RAMPS board until you get a reasonable value reported for temperature by the firmware.

Thanks Polygonhell, Looks like I've fried my Rambo

I'm thinking when my power on LED lost it's legs the earth pin must have hit the board and earthed something it shouldn't