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3D printer Ender 3 pro oval hole problem

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Will_D:
That's good to hear. I am still printing it though.

One thing to check is that after the first hour or 2 the belts may need adjusting. A bit of backlash in one of the axes would lead to oval holes,

I check my bed for level quite often using the attached gcode file. You may want to edit it to set your temperatures. It also leaves the heaters on!

Joules:
Thanks Picclock, those are the values I would use, those springs must have come from an old mattress if they drag about that much LOL   Glad you are getting the results you hoped for.

mc:
The spring upgrade is one of the first things recommended for an Ender 3, however despite buying them, my silicon buffer kit is still sat in the bag they came in, as I've never felt the need to upgrade
I do however run the stock springs pretty compressed, which is probably the big problem with anybody running the stock springs.

I'm also using a glass bed, so my Z switch sits a bit higher that normal, but even with the standard bed, you could just cut the locating tab off, and move it lower to get more compression on the springs.

The other option is adding a BL touch, which is something I keep considering, but I keep seeing mixed reviews about them. Plus there is a huge variation in prices depending on brand/source, and nobody seems to know how much they vary in quality/repeatability.


I upgraded mine last week to the SKR Mini E3 board (I opted for the integrated driver version), and the BigTreeTech 3.5 TFT.
The noisiest thing now are the cooling fans, with only a slight hum of the steppers at certain speeds. It's bizarre not hearing it home until you hear a switch click!

I wasn't that impressed with the TFT, but now I've updated it to the latest firmware with the unified graphics, it's far better. I do like how you can switch it between touchscreen and LCD mode, you just need to make sure you connect all the cables.
The E3 board is still running whatever firmware it shipped with (I really can't be bothered going down the software compiling rabbit hole just now to change something that's working fine!).


My next upgrade is a MicroSwiss extruder/hotend, which is currently in the post somewhere between the USA and here...

picclock:
@mc
>>I'm also using a glass bed, so my Z switch sits a bit higher that normal, but even with the standard bed, you could just cut the locating tab off, and move it lower to get more compression on the springs.

That's exactly what I did. The springs also contact the heater element with just a piece of film between - looks like an accident waiting to happen.

@Joules - the springs are about a fith of the diameter off mattress springs, even thought of making some. I may junk them altogether when I fit a touch sensor and a mains powered silicone pad heater, and just set it up with nuts locked to the support plate. My scrap Prusa had this setup and I never looked back.

@Will_D
Frame squareness, bearings, belt tightness were all checked before I posted here. My big mistake was not to consider the bed springs. For some reason I just assumed they would be OK as supplied. I quite like the magnetic bed for ease of print removal, And will likely order some spring steel ones for smooth surface. The great advantage of a touch sensor is that you can swap the build surface without doing any adjustments, making it a much less fiddly. Hopefully this will last as long as my Prusa did. May even use the Prusa E3D head on it if I have to do very high temperature stuff.

Happy Easter :wave:

Best Regards

picclock
 

Will_D:

--- Quote from: picclock on April 13, 2020, 02:23:39 AM ---Measurement of 11mm test hole gives 10.95 x 11.07, which for plastic is pretty good.

--- End quote ---

My results are in:

The 11mm hole measured 10.70 - 10.74. Now I have noticed this with other holes and female threads  They are all undersized.

As another check I measure X, Y and Z dimensions. I assume you designed it as 100 x 25 x 6

I got 99.81 - 99.84, 25.07 25.10, 5.94 - 5.97

Cheers Will

Stuck indoors waiting fr DPD to delivery my early Birthday Present R-Tech Plasma cutter. Thanks DoubleBoost!! :ddb:

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