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Ender 3 bed element removal

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picclock:
Well, I gave it a go but no-go,  The other side of the bed has a layer of magnetic rubbery stuff which the print surface sticks too. This lets it to spring when clamped to the mill table. Also when it cuts through the grey layer the aluminium tends to grab the tool making it deeper at that point.

All rather sad really. I have other bits on the way, including 3mm aluminium and sticky magnetic sheets good for 130C continuous, so it was always going to be a stopgap. Also have a spring steel pei coated build surface on its way.

Could use 4mm, as you suggest but the extra weight ~150 gms (around the same weight as the silicone heater) would slow down the action even more. Just feel that 2mm aluminium is too flimsy.  Original bed weight inc heater but no wires is around 560gms excluding print surface. Weight of bare aluminium sheet is 447 gms, so I reckon original bed heater is ~60 gms, allowing 50gms for magnetic rubber.

Well at least I found out why people dont do it that way  :(

Best Regards

picclock

ddmckee54:
picklock:

If the original print bed is hosed and you are going to replace it anyway, try loosening up the heater with an aircraft type paint stripper.  The kind that will strip any paint off any surface.  That might make the original bed heater soft enough to scrape off the print bed.  At this point you haven't got much to lose right?

Don

picclock:
@ddmckee54
I'm not sure what the white/grey chemical is. I have tried all the chemicals I have readily at my disposal including acids and most solvents, (excluding those that react with aluminium) to no effect. What is the active ingredient in aircraft paint stripper ?

Its really just an academic exercise atm, as I have new stock of 3mm aluminium, and can use clips to hold the build surfaces until the magnetic self adhesive surface arrives.

The mods I am doing are to my ender 3 are to enable printing of higher temperature materials, and to bring it up to spec with my old printer. Fast bed heating and auto bed levelling are a must for me. Automatic homing using the stepper motor drivers will also be a first (no microswitches  :bugeye:).

If anyone is interested I will do a mini build write up in project logs.

Best Regards

picclock

awemawson:

"What is the active ingredient in aircraft paint stripper ?"

Methylene Chloride probably

Brass_Machine:

--- Quote from: picclock on May 10, 2020, 02:22:14 AM ---...
If anyone is interested I will do a mini build write up in project logs.
...

--- End quote ---

Please do. I have an all metal hotend (coastal robotics) but hadn't thought about replacing the bed heater...

What do you plan to use for the auto bed leveling? I have a BLTouch though I am still not sure if I like it.

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