Solved Problem with bumps near corners

Ive been working with the ROBO3D for a couple of months. Had no problems with the first print jobs, but now there is one in particular; if Im printing a rectangular or any form with corners, appear bumps near the corners, the surface doesnt feel nor look flat. How can I fix it?
Thank you, greeti ngs from Mexico. (sorry for my english)
Add a pic for you to see

 

That looks like a hardware error. Something seems to be lose. Possibly belt, pulley, pillow block. Does it appear on the same axis/corner every time? Could be a speed issue but it should happen in every corner if that's the case

 

I agree. It looks like something is loose or broken. Check over the machine and see if the belts are tightened appropriately and if the belt tensioners are not cracked. Also check the bearings to make sure they are secured and not sticking. Things like that. Looks hardware related to me.

 

Thank you guys (Ryan and danzca), Im gonna check all those parts. Add a couple of pics to show you a printjob test, it seems the problem is on the X axis.

 

also make sure that the pulley gear on the X and Y axis is secured tight to the stepper motor stem with the little grub screw used to lock it into place. Those come loose as well.

 

is this the part to which you refer? Its tight, also the belt. I did another print job test with the same results.

 

Make sure you check everything for the Y-Axis as well. Just because the problem shows up on the X-Axis does not necessarily mean the problem lies within the X-Axis.

What speeds are you printing at? It's overshooting every corner.

Can you enter M503 in the G-Code Terminal and paste the results here? Looking for something like this:

M201 X9000 Y9000 Z100 E10000
M204 S1300.00 T3000.00

**Note: these are bad numbers!**

 

Thanks. Now Im gonna check the y axis. Its should be on the bed, right?

 

under the glass plate. Raise the Z axis up a good amount and then you should be able to lift and slide the glass build plate out the back of the printer to get to the stepper motor. Check the gear, check the belt connectors, check the bearings. Make sure things are tightened appropriately.

 

These are the speeds:
Can you tell me how do I do the part of the G-Code M503 thing?
Thank you.

 

Are you using MatterControl as the Slicer?

If so, at the top there should be a 'View' (I think) Drop-Down menu, then you select Terminal. When you have your printer connected type M503 and hit Enter. It should spit our a bunch of code.

This is more than likely not the issue but would make the problem less drastic.

 

Thanks, man. Look, here is the M503 View Terminal

 

Problem solved, it was a mechanical problem all this time. The belt beneath the bed was loose, just had to tight it. Now prints correctly.
Thank you so much guys for your help. Greetings from Mexico.

 

Great to hear!

 

Now you just need to lower your Acceleration Settings in the firmware, in order to improve print quality.

 

Oh and calibrate your extruder. I see you still have the default steps 723.38

 

Sorry, I was a little busy, but thank you for your help. Could you tell me how to lower the Acceleration Settings on firmware and the extruder calibration thing?