Solved Extruded problems & y axis over movement

ok, so here is my consistently inconsistent problems. I have two problems that seem to just happen randomly. I use simplify 3d and matter control on my MacBook Pro and it's a r1 with 8mm auto level. First problem, when i begin to print and the auto level runs, when it gets to the last 3 points the belt grinds like it thinks the table is bigger than it is. Second, when I am in jog controls and hit extrude, it has no problems extruding as much filament as I want but as soon as a print starts, filament grinds and nothing extrudes. I have noticed the extruder is going much slower when printing than when I manually extrude, don't know if that makes a difference. It looks like the z axis keeps goin too low and clogs the hot end. Sometimes it starts grinding into the adhesive on the bed. I have had my printer since February and for the first couple months had no problems. This started happening out of the blue and not all the time but getting more frequent. I have been told to change settings, increase z offset, take apart hot end to clear clogs, flash my firmware, try the paper trick. I have done all this and no luck, same things keep happening. Has anyone had these issues and fixed them?

 

Oh yea, also checked the y axis belt, all buts bolts and screws and z axis limit switches are not slipping or too low

 

Did that, I had a Skype session with robo3d. They told me z offset should be set between -.8 to -1. I am at -1.8 and still the same. I don't understand how it could be offsets because I printed a ton for first 2 months with factory settings with no problem. Now for past month I can't print a thing

 

Ok, I'll give the code a shot. Any ideas why my bed overtravels?

 

What are your bed settings?

 

Had a super busy weekend so didn't get to mess with my printer till just now. Finally figured out the y axis problem. One of the wires under the bed would slip out of the clamp and stop the bed from full travel and I would get the belt grinding. Put a piece of take temporarily on the clamp to keep the wires in. I'll come up with a better fix after I get the z axis issues worked out.

 

Don't know why this thread was marked solve, partially solved. So I played around with z axis settings and same result every time. I just cannot get it to print. I hit extrude in jog controls and no problems pushing abs. Hit print it will not extrude at all. I've tried my settings from -.9 to -2 with no success. So frustrated, I feel like I just keep throughing money at this thing.

 

This might sound a little crazy, but try changing the infill %. When I used to use mattercontrol for some models it would hangup and not print because the infill layout did not match the print well.

After you click print and the printer goes through the autolevel do the gears on the extruder turn at all?

 

I've tried multiple prints. Models, calibration tests, different quality, different infill, all with same results. I even use both matter control and simplify 3d. Gears are spinning when it starts printing. Sometimes the filament gets jumbled up on the outside of the nozzle, sometimes it gets jammed up and grinds the filament till it can't extrude. To me it seems like it's all because the nozzle is too close to bed but every attempt to change z offset produces same result

 

What is your autolevel procedure like? Does the nozzle make contact with the bed in all 9 locations?

 

Yup, it auto levels well. Even in simplify3d using the auto bed leveler it works.

 

How large of a Z offset have you tried?

 

Anywhere from -.9 to -2

 

Try like -5 as a sanity check.