The green field is 0,35mm between nozzle and bed
The red field is 0,2mm between nozzle and bed.
What i have as a effect as of late is my larger prints will not stay attached to the bed because it gets free on one side and basecly hits one of my nozzles (i have 2 heads even thow the image doesnt say so ) after a couple of layers.
I seam to have a memory that someone had a simular issue with a bent effect on the bed. Cant find the thread but this is the description on my issue. Anyone have any sugestion on how to come around this one?
Many suggestions but unfortunately no solutions…
People have tried taking a hammer to the aluminium bed, padding the glass bed underneath, etc. There’s no cure as far as I know and Velleman are silent on the issue.
I put a clip on my bed top middle and what happened was that the light blue area went down to 0,35mm. Unfortualy i do not have more clips to try the middle of the 3 other.
Reason why i decided to try it was how the bed uphold construction is designed. But i do not think the alu plate is my problem anymore. I havent messured it yet so not ruling it out but. If the glas plate is lifting from the alu plate described with my somewhat simple fix for the light blue area. Could it maybe be the standard holding clips that unintentialy pressure the glas upward in the middle and back pushing the corners down or am i out on a limb with my reasoning?
My next question is as a followup based on the above asumtion how to push the middle down toward the alu plate if it is flexing upward from it that is.
I had one idea unfotualy i do not have double sided tape home but i gues you understand what i was thinking on doing basecly put tape bet glas and plate and not use the outer clips and see what happens. downside with that is the ability to remove the glass wish is handy. Just as i wrote this i got an idea. Gonna see what happens if i remove the corner clips from the plate as a test.
Apparently im to briliant for my own good I tested the theory i had and just detached the clips enouph to just hold them litle toward (Like picture show) the glas and bingo now it is 0,35mm all over.
Now i do have the issue of making the plate stay in one place without the clips pressuring the centre-back upward. Anyone have any good idea? i could do something with the clips i gues.
Well im not so shure the tape solution is very practical. And im not so shure on the spacer idea eather. Reason why is the problem for me is that the center and middle top is raising itself from the plate by outer corner pressure it seam. what is needed is a eaven locking to the plate that prevent it from lifting and making the plate stay in place. I had an idea when i was out on the playground with my daughter to make a plastic frame for the plate so the plate basecly rest in the frame.
Have You checked that the AL-plate is more concave than convex ?
What I did:
Knocked the AL-plate with a hammer in the middle (It was convex before).
Then I grinded it with abrasive paper.
The glass must be fixed without tension.
I also had an uneven bed and found a solution that works for me. Examination revealed that the alu plate was far from flat, it had a big bump in the middle. Clamping the glass plate down at the four corners caused deformation.
I don’t think this is a design feature but rather a quality issue…
I didn’t risk nocking on it with a hammer because I feared for unwanted deformation. So I just flipped the bed, and drilled out holes for the sunken screws. I managed to mount it with 3 clips on their original location, and one clip without screw now but it still holds the glass plate firmly.
Now the glass plate is clamped at the four corners and ‘floating’ above the alu-plate in the middle. My bed is flat…
Managed to get hold of some additional clips and i bent the printer clips a litle so they dont press so hard and now it is flater then my table surface and finally i could print the big print i wanted without knocking it off. Had an initial problem with shifting layers when i got it to print properly again but some oil fixed that.
) after a couple of layers.
I tested the theory i had and just detached the clips enouph to just hold them litle toward (Like picture show) the glas and bingo now it is 0,35mm all over.
