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fabnavigator
(@fabnavigator)
Trusted Member
MK4 kit screw quality

My MK4 kit delivery is a few days out so I started reading the assembly instructions comments. I found the comments very useful when I built my MK3S a few years ago.

I'm seeing a number of comments that mention poor screw quality.

 "I ordered my Mk4 December 22nd, 2023 and received it today January 24th, 2024. I'm amazed they are still shipping these with the same garbage hardware. Not a great way to start off the build when 2 of the screws stripped before they were more than finger tight." (buttsisfun)

"Ditto to what everyone else is saying.  These screws are total rubbish.  Some of them are so over tolerance that the only way to tighten them is to us a US size Allen wrench.  I much admit that my confidence in Prusa quality is already badly shaken!" (Norris)

Is this really an issue? Do I need to go out and buy some screws?

Posted : 27/01/2024 2:08 pm
Tom De Winter
(@tom-de-winter)
Trusted Member
RE: MK4 kit screw quality

No problem what so ever with the hardware or anything else with my MK4 kit.

Posted : 27/01/2024 4:58 pm
Rainer
(@rainer-2)
Reputable Member
RE: MK4 kit screw quality

On the contrary, I was pleasantly surprised by the quality of the screws. No problems at all when assembling the MK4 kit.

Posted : 27/01/2024 5:19 pm
JP Guitars
(@jp-guitars)
Estimable Member
RE: MK4 kit screw quality

Same here, no problems with quality of the printer, enclosure and fittings, cannot say the same about the tools supplied, it didn't worry me as I just grabbed my some out of my toolkit

Posted : 27/01/2024 7:32 pm
foxontherun
(@foxontherun)
Active Member
RE: MK4 kit screw quality

Yeah, all screws were of good quality. No problems whatsoever with the screw in my build.

Posted : 29/01/2024 12:18 pm
cakloiber
(@cakloiber)
Member
RE: MK4 kit screw quality

I only had one screw on my kit strip, and that was probably my fault by cross threading it. This was on the Y-axis idler pully bracket,

Posted : 29/01/2024 2:32 pm
fabnavigator
(@fabnavigator)
Trusted Member
Topic starter answered:
RE: MK4 kit screw quality

Thank you for the feedback. My kit arrives today.

Posted : 29/01/2024 3:37 pm
Annata Evan
(@annata-evan)
Member
RE:

Mine has no problem at all

connections nyt

This post was modified 2 months ago 2 times by Annata Evan
Posted : 21/02/2024 8:11 am
iftibashir
(@iftibashir)
Honorable Member
RE: MK4 kit screw quality

No issues here either!

ORIGINAL PRUSA MK4 KIT - Full step-by-step video assembly guide!

>ORIGINAL PRUSA MINI+ Full video assembly guide!

Posted : 21/02/2024 4:26 pm
fabnavigator
(@fabnavigator)
Trusted Member
Topic starter answered:
RE: MK4 kit screw quality

I didn't have any issues with the hardware either.

Posted : 21/02/2024 6:13 pm
Perry C
(@perry-c-2)
Eminent Member
RE: MK4 kit screw quality

I did have some issues with the heads of the largest screws that attach the rails to the frame. Quite possibly could have been more an issue with the included allen key.  If you feel you do not have good engagement - don't torque it, but look for another screw or try a better made allen key.  There are plenty of extra fasteners in the kit of all sizes.  I did not have any issues with the smaller sizes.

ALSO - some of the smallest screws are Torx head, so keep that in mind - I thought I had a key/head issue until I realized oh... it's a torx... 😜 

Posted : 22/02/2024 1:52 am
yekcoh
(@yekcoh)
Member
RE: MK4 kit screw quality

I believe it's because they are stainless steel screws and wrenches are steel. Don't over torque. I just built mine last week, no issues.

Posted : 22/02/2024 3:54 pm
1_mg_1
(@1_mg_1)
Eminent Member
RE: MK4 kit screw quality

I had one bad screw in my kit that wasn't machined properly. The rest were perfect, no issues building my kit.

Posted : 22/02/2024 7:23 pm
vhubbard
(@vhubbard)
Estimable Member
RE: MK4 kit screw quality

I have built 3 MK4/MK3.9 kits.  Last one shipped in October, 2023.  Had one square nut jam or sieze, partly my fault.   As for the hex wrenches, I have my own high grade set with screw driver handles.  Much faster to use.   

A confusing thing is one of the torx wrenches is 2 sizes, different on each end.   Allen wrenches seem to fit in the torx heads but slip when tightening.    My eyes have a hard time seeing hex vs. torx head screws these days so I had to double check often. 

Posted : 02/03/2024 2:03 pm
Zappes liked
Hursty808
(@hursty808)
Member
RE: MK4 kit screw quality

I have just finished my first Prusa Build, (mk4) for the most part all the screws and fasteners were fine, the only screws I had a small issue with were the screws that held the frame together, most of them were fine, I had half a dozen or so where the tolerance of the hex wasn't great and my Allen keys just couldn't get much purchase. I managed to get them pinched up, but probably not as tight as I would of liked.

Posted : 10/03/2024 2:02 pm
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