Solved Robo3d R1 heated bed going up during print

Guys,

I'm running into a bit of a wierd problem with my Robo3d R1. I have the Robo3d R1 with the 5/16" rods, at least I think they are the 5/16"s.

I updated the firmware to the R1+ Firmware v2, then I realized that I don't have the R1 + because I have the blue lights instead of the white. So I loaded a new firmware, the R1 with 8mm rods. That lead me to a problem doing large movements with the Z axis. If I job them 1mm at a time it worked just fine, but as soon as I'd try and move them 10mm they'd move about 3 then the motors would make a loud humming sound.

I finally ended up trying the R1 firmware for 5/16" rods and now I can move up and down with no problems with small movements and large and I am able to home my axis.

Time for a test print. I printed a small y belt holder and 1/2 through the print the heated bed reached max temp of 111 and the print failed.

I'm using Simplify3d and if I go and turn on the heated bed to 60 it will stay there with no issues, bouncing between 59 and 61/62. As soon as I start a print however the temp starts going up and up and up.

I'm trying to print PLA with an E3D hot end using 1.75mm filament. The firmware is stock R1 firmware for 5/16" rods with the exception of uncommenting the line for the LCD display and changings the #33 and 31 pins in the pins.h file to make the dial on the LCD work as expected.

What would cause my hot end to only go up during a print?

 

To be honest I'm not sure. I got it used other than rod size is there any way to know which version I have? 8mm and 5/16"s are both .31"

 

I have one on each z-axis rod, so 2.

 

G1 Z5 F5000 ; lift Z by 5mm
G28 ; home all axes
M565 Z-.68; set the offset for auto-leveling mechanism
G29 ; run auto-level
G1 Z5 F15000 ; lift Z by 15mm
M300 S440 P200 ;A4: 440
G0 Z5

 

Like I said in my original post I tried the R1 8mm firmware and had issues moving the z axis over large movements, and with the 5/16" firmware that issue doesn't exist now. That's why I thought I had 5/16" rods.

 

This all happened because I just installed both a new arduino and ramps board. What bothers me is that as long as I'm not printing and have the heated bed on it will hold 60 all day long. It's when printing starts that it goes nuts. You mentioned that I most likely have 8mm rods. That was my first guess too but when I tried the 8mm rod firmware I had issues with large movements. I could jog 1mm at a time all day long up and down, but as soon as I try to move 10mm at once it wouldn't. Don't seem to have that issue with the 5/16's firmware though. As i said I've measure the rod and it's .31" but that's what 8mm is and 5/16 as a decimal. how can I tell what I really have ?

 

Ok I just jog Z up 100mm and after I measured it the actual movement distance was 88mm, guess that means I have 8mm rods after all? So I'm guess my next step is to install the 8mm firmware and see what happens?

 

OK so here's where I'm at now. I've reinstalled the 8mm firmware and the probblem I was having doing large movements is still persisting. While working through this problem yesterday I tuned all my stepper drivers, even replaced the z stepper with 2 known good ones and still have the issue.

If I put the 5/16th firmware back on and change the z steps from 2267.73 to 2560 should that make it correct?

PS - Thanks for all your help so far. I've been working on this printer since I got it and I just really want to get to printing

 

Ok I've gone back to the 5/16" firmware and made the change to the z axis steps but now I'm running into the problem that when I jog 10mm or 100mm that the stepper motor doesn't spin correctly. I can jog 1mm at a time all day up and down. Also it's not consistent with the 10mm jogs, every now and then it works, but I'd say 90% of the time it doesn't. And a 100mm job never finishes.

At the point when it "binds" I'm able to manually give it a push and it continues on it's way until it binds again at least.

Any suggestions?