Update Bill-of-Materials.md

Author: BT123D

wiki/Bill-of-Materials.md

@@ -26,7 +26,7 @@ x1 per toolhead
 **Note:** heatsets on the SB version in from the opposite side as the Voron instructions, slightly longer screws on the CW2 attachment may be required
 
 - [4] m3 heat inserts
-- [3] Ø4x12mm ssRod (dowel pin) with a rounded end **(if it has female threads on the back it will be listed as an M3, but make sure the pin is 4mm OD, that is what is important)**
+- [3] Ø4x12mm ssRod (dowel pin) with a rounded end **(if it has female threads on the back it will be listed as an M3, but make sure the pin is 4mm OD, that is what is important. We recommend the threaded pins for better fixing)**
 - [1] 6x3mm magnet (N52 Highly recommended to counter the pull from the umbilicals. Note that most magnets not from a reputable source may say N52 but aren't actually. Recommend one of the two links below.)
 - [2] m3x6 or m3x8 FHCS (Flat head countersunk screw, MUST BE MAGNETIC. no stainless, as per TAP)
 - [1] [OptoTap](https://s.click.aliexpress.com/e/_DEGsGTV) (only the sensor PCB is required)