Machined "Magnum" Pulleys for your Railcore

Tested and approved by the creators of the Railcore II 300ZL/T Printers

[Railcore Upgrade Parts]

Aluminum Idler Pulleys - $39

I'm happy to announce the arrival of the "Magnum" Idler Pulleys for the Railcore!

The Magnum's allow you to streamline your printer setup - eliminating 2 of the shoulder bolts entirely and allow you to "stack" your smaller toothed idlers with the Magnums. The Magnum Pulleys also simplify the kinematics of the belt system for your printer. In additional to all of that, they look super awesome!

They have been several iterations of these idlers, as well as numerous design tweaks and quite a bit of testing! We hope you enjoy them!

If you are using the "china" idler pulleys, you can use the existing20mm shoulder bolt, but if you are using the "Gates" idlers, you will need to purchase 25mm shoulder bolts.



We currently have international shipping configured for United Kingdom, Turkey, Germany & France. If you are not in one of those countries, please send us an email at email order and we will get shipping configured for your country.

Washer Stacks

Using the washer and shim washers with the 25mm shoulder bolts and the gates idlers:

X Carriage stacks (from top down)
  • 4 - 5mm Washers
  • 1 - shim washer
  • Gates Idler
  • 1 - shim washer
  • Gates Idler
  • 1 - shim washer


Idler stacks with Magnum Pulley:
  • 2 - 5mm washers
  • 1 - shim washer
  • 1 - gates idler or big pulley
  • 1 - shim washer
  • 1 - gates idler or big pulley
  • 2 - shim washers
  • 2 - 5mm washers

This has put in me in a rather good alignment thus far.