Can deform 4mm print glass

[peter247]

Hi , building up my blv cube and doing a little setting up , homing , offsets , levelling etc.
This is my first test of mesh levelling with the 4mm aluminium plate which came with my cr10s pro v1 and it's glass which replaced it.
( It is just a test waiting for a ALUMINIUM TOOLING PLATE .)
This is cold and the aluminium plate is no way level , BUT is this the glass or have I got a mechanical error somewhere ?

Still missing some screws so can't print yet , which should tell me if I've got z problems.

[Martin1454]

@peter247 What type of probe do you have? the result looks acceptable, but if anything my guess is on the probe or mechanical issue

[peter247]

@martin1454 Bltouch

[jens55]

@peter247, for a standard off the shelf printer, this is about as good as it gets, Be happy !

[dc42]

@peter247 what type of machine is the CR10S pro V1? Does the bed move in Y, or the gantry? If the gantry moves in both X and Y then I think the Y gantry is sagging a little.

[deckingman]

@peter247 said in Can deform 4mm print glass:

.................................. This is cold and the aluminium plate is no way level , BUT is this the glass or have I got a mechanical error somewhere ?....................

It's pretty close, but it's impossible to discriminate between the gantry sagging or the glass being bowed by looking at the height map. I find a precision straight edge is invaluable. With one of those and good lighting, it's quite easy to determine if the glass (or aluminium plate) is flat or not. If you don't want to spend too much money, look for a plasterers feather edge - something like this https://www.amazon.co.uk/Faithfull-Feather-Edge-Scale-Fe48/dp/B0001IWKOA/ref=asc_df_B0001IWKOA/?tag=googshopuk-21&linkCode=df0&hvadid=309808827530&hvpos=&hvnetw=g&hvrand=2730341869416505663&hvpone=&hvptwo=&hvqmt=&hvdev=c&hvdvcmdl=&hvlocint=&hvlocphy=9046150&hvtargid=pla-588189221888&psc=1&th=1&psc=1

[peter247]

@dc42 The cr10s pro v1 moves the Y axis , But I'm just use it for it's metal plate , so the cr10s pro is just used for parts until I get something better, for this core xy I'm working on .
Not sure how much sag you can get with linear rails ?

[peter247]

@jens55 It is worse than off the self , it's a self build so there is a million ways I could have built it wrong.
But it is a start and I haven't finished building it yet, waiting for screws which hold the extruder in place, etc .

It was just a question of can the printer's glass bed bow than much ?

[dc42]

@peter247 said in Can deform 4mm print glass:

The cr10s pro v1 moves the Y axis

Do you mean that it moves the bed in the Y axis?

It was just a question of can the printer's glass bed bow than much ?

It's more likely that the Y gantry (if it has one) is sagging in the middle, especially if it is carrying the weight of the X motor.

[peter247]

@dc42 the height map is from this :

https://www.blvprojects.com/blv-mgn-cube-3d-printer

[jens55]

@peter247 said in Can deform 4mm print glass:

@jens55 It is worse than off the self , it's a self build so there is a million ways I could have built it wrong.

It was just a question of can the printer's glass bed bow than much ?

Neither one of my two operational printers has a build bed that flat. I would be very happy indeed with that outcome. Mind you both are bed slingers so several levels below what you are building ....

Yes, a glass bed can bow that much. Rotate the glass 90 degrees and do another bed probe to see if the hump moves with the glass.

[Phaedrux]

@jens55 said in Can deform 4mm print glass:

Rotate the glass 90 degrees and do another bed probe to see if the hump moves with the glass.

[peter247]

@jens55 Not sure if this is my only problem .

It was a fitting what I had in hand to test it out and my countersunk screws was a little short so could not fit a nut to hold the screw in place , So I think that the glass bed may have been resting on the screws edges and not the bed it's self .
Now I have got all my remaining screw I hope it is time to do a test print , which should show up any z wobble and out of squareness.

[peter247]

@jens55 @dc42 @deckingman

Now this is better