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Reassemble with correct screws? Poll is created on Oct 26, 2025

  
  

[Solved] I messed up my screws...  

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Christina Lang
(@christina-lang)
Member
I messed up my screws...

Hello,
soooo I messed up.

I built my Core One about a week ago - did several benchys and already some prints I am using and everything works fine. I wanted to sort away all my spare parts and manuals and found a completly unopend package of screws (M3x4r). 

So it seems I used the M3x4rT instead of the M3x4r in the Chapter 4 steps 7 to 9.

My question now... how bad is this? It seems to work perfectly fine so far, but I don't know if this could lead to long term damage or it already did damage and I just didn't notice it?

Napsal : 26/10/2025 12:45 pm
CJD
 CJD
(@cjd)
Trusted Member
RE: I messed up my screws...

The only difference is they're torx vs hex, no? Should be no damage, same thread pitch and length. head size the same so no risk of a collision or anything like that. I'm honestly not sure why there are both variants, but as long as you had enough of the T versions where they are specced I suspect you're fine.

Napsal : 26/10/2025 4:04 pm
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hyiger
(@hyiger)
Honorable Member
RE: I messed up my screws...

No, you won't damage it since the M3x4r screws are just for securing the heat bed brackets. Pretty sure you can just leave it as-is and not worry. The other set (M3x4rT) are for securing the power supply and buddy board box. Why Prusa chose to use different screw types for this is beyond me.

I had reused screws from taking apart my MK4S to do the upgrade so I ended up with extra bags (which confused me at first). 

"Some filaments feel the rain, others just get wet"

- Bob Marley

Napsal : 26/10/2025 4:09 pm
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Christina Lang
(@christina-lang)
Member
Topic starter answered:
RE: I messed up my screws...

@cjd @hyiger - thanks for the quick answers - you two confirmed what I hopped.
Just wanted to get some outside opinion to make sure I didn't miss any difference.

Napsal : 26/10/2025 5:02 pm
k1mu
 k1mu
(@k1mu)
Estimable Member
RE: I messed up my screws...

I made the same error, and realized it when I was trying to do some bed leveling using spacers under the expansion joints.  The torx screwdriver that comes with the kit will not fit into the holes in the expansion joint - I was able to fasten the (wrong) torx screws using my driver as it has a longer "biting" surface.  I eventually did correct these, but there's really no reason to as long as you're not playing with the heat bed.  As @cjd and @hyiger have said, there's no reason to go back and correct this unless you're as OCD as I am. 🙂

Napsal : 26/10/2025 11:33 pm
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