Machined "Magnum" Pulleys for your Railcore

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

[Magnum Pulleys]  [Magnum Idler Mounts]
[Railcore Upgrade Parts]

The Magnum Idler Mounts are the newest addition to our parts for the Railcore 2 printers.

They remove the overhang on the left side of the printer and move the Idlers INSIDE the volume of the printer. It shortens the belt significantly by 6-8 inches.

One of the benefits of this is that it's going to be even easier to enclose the top of the printer using the enclosure which is available from Mandala Rose Works at our Top Enclosure Page.

PLEASE NOTE: You will need to use an 8mm bolt instead of a 10mm bolt to install these due to the countersunk holes.



We currently have international shipping configured for United Kingdom, Turkey, Germany, France, Sweden, Netherlands, Indonesia, Brazil, Ireland, Norway, Belgium, India, Austria.

If you place an order from a country not in the list above, you will receive an invoice for the appropriate shipping amount.

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. Please include your full shipping address so we can get the correct pricing for you.

All imports, duties, taxes or customs charges are the reponsibility of the receipient.



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 existing 20mm 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, Sweden, Netherlands, Indonesia, Brazil, Ireland, Norway, Belgium, India, Austria.

If you place an order from a country not in the list above, you will receive an invoice for the appropriate shipping amount.

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. Please include your full shipping address so we can get the correct pricing for you.

All imports, duties, taxes or customs charges are the reponsibility of the receipient.

Recommened Washer Stacks
(Starting Point)

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.

Please Note: This is just a starting point. You may have to tweak this a little bit as washers are not all the same thickness.