M3 grub screws don't fit Hello, I noticed that the M3 grub screws are not fitting my stepper driver pulley. My local hardware store doesn't have anything smaller than a M4... I'm assuming I need either an M2.5 or M2. Does anyone have any experience with this? I looked online but I won't know if they fit, and I'd have to buy, like, 50 even though I just need 2. Thanks. https://reprap.org/forum/read.php?1,759579,759579#msg-759579 Tue, 06 Oct 2026 05:20:01 -0400 Phorum 5.2.23 https://reprap.org/forum/read.php?1,759579,760180#msg-760180 Re: M3 grub screws don't fit https://reprap.org/forum/read.php?1,759579,760180#msg-760180 epicepee General Sun, 02 Apr 2017 21:51:05 -0400 https://reprap.org/forum/read.php?1,759579,760170#msg-760170 Re: M3 grub screws don't fit https://reprap.org/forum/read.php?1,759579,760170#msg-760170
I like the idea of using a regular screw to identify the pitch.

Could it be SAE (English) 6-32, 4-40? The shorter the hole, the finer screw you need to use. Tapping a bigger hole may not work because the edges of the screw could interfere with the radius of the pulley or you wouldn't have enough threads engaged to work.]]> kengineer General Sun, 02 Apr 2017 19:29:03 -0400 https://reprap.org/forum/read.php?1,759579,759791#msg-759791 Re: M3 grub screws don't fit https://reprap.org/forum/read.php?1,759579,759791#msg-759791 dart16 General Fri, 31 Mar 2017 18:27:51 -0400 https://reprap.org/forum/read.php?1,759579,759604#msg-759604 Re: M3 grub screws don't fit https://reprap.org/forum/read.php?1,759579,759604#msg-759604 dc42 General Fri, 31 Mar 2017 02:38:35 -0400 https://reprap.org/forum/read.php?1,759579,759596#msg-759596 Re: M3 grub screws don't fit https://reprap.org/forum/read.php?1,759579,759596#msg-759596
Might be easier than other solutions.

Alternatively, if you can find an M2.5 screw that fits, then you can cut the end off and dremel a flat into it, and use a flat screwdriver. Hobby shops have a multitude of small screws.]]> nebbian General Fri, 31 Mar 2017 00:39:25 -0400 https://reprap.org/forum/read.php?1,759579,759579#msg-759579 M3 grub screws don't fit https://reprap.org/forum/read.php?1,759579,759579#msg-759579
I noticed that the M3 grub screws are not fitting my stepper driver pulley. My local hardware store doesn't have anything smaller than a M4... I'm assuming I need either an M2.5 or M2. Does anyone have any experience with this? I looked online but I won't know if they fit, and I'd have to buy, like, 50 even though I just need 2.


Thanks.]]> adenton General Thu, 30 Mar 2017 20:30:19 -0400