dfh.fm
DFH 440c Linear Rails
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440C stainless MGN rails for printer and small-CNC motion. DFH 440C Linear Rails are miniature linear guide rails with matching carriages, stocked across MGN7H, MGN9C, MGN9H, MGN12H, MGN15H, and selected MGN15C dual-carriage formats with Z0, Z1, or selected Z2 preload options.
Why pick 440C rails?
- Corrosion-resistant 440C stainless steel is a better fit for humid shops, enclosed printers, and machines that may sit between jobs than plain carbon-steel rails.
- MGN-format rolling guideways give compact, low-friction linear motion for 3D printers, CoreXY gantries, beds, probes, fixtures, and small CNC or mill projects.
- Preload options let you tune the axis: choose easy motion for lightly loaded axes or more constraint where stiffness matters.
Choose the right preload
- Z0: light preload and the easiest hand feel. Use for Z axes, bed motion, Ender-style conversions, and low-load axes unless your BOM specifies otherwise.
- Z1: more constraint than Z0. Good for X/Y gantries, CoreXY motion, toolheads, and general printer motion where stiffness matters more than free-fall feel.
- Z2: higher preload on selected variants only. Use when the build needs extra stiffness or support; expect a noticeably tighter feel before grease and break-in.
Specifications
- Series stocked: MGN7H, MGN9C, MGN9H, MGN12H, MGN15H, and selected MGN15C dual-carriage rails.
- Lengths stocked: 50mm through 500mm depending on selected rail type.
- Material: 440C stainless steel linear rail assembly.
- Preload: Z0, Z1, and selected Z2 options.
- Sold by selected variant: standard MGN variants are rail + carriage; MGN15C Dual Carriage variants include the second carriage.
- Preparation: rails may arrive with light storage oil or EP2 grease depending on batch. Wipe, inspect, and grease before final service.
Fitment notes
Use the exact rail type, length, preload, and carriage count from your project BOM. These rails are commonly used in Voron, CoreXY, Ender-conversion, fixture, and compact CNC builds, but a rail that is close is not always interchangeable.
If you want a project-specific rail bundle instead of loose rails, see the live DFH 440C Salad Fork 160mm Linear Rails Kit, BeltDrivenEnder3 440C Stainless Steel Linear Rails Kit, or Zero G Mercury One.1 Linear Rails Kit.
Gotchas before you install
- Higher preload will not free-fall. Z1 and Z2 rails often feel tight by hand, especially before grease and real machine load.
- Do not cut unless you know the process. If you must shorten a rail, use an abrasive method with shallow passes and control heat to avoid warping.
- This is not a full motion kit. Order belts, pulleys, idlers, fasteners, and project plates separately unless your BOM only calls for the rail itself.
“Super smooth” — verified buyer
Shipping & Returns
Returns:
Thank you for purchasing from dfh.fm. I want you to be completely satisfied with your purchase. If for any reason you are not satisfied, you may return your purchase within 60 days of the original purchase date.
Defective items: Please inspect items upon receipt. If you receive a defective item, you may return it for a full refund or replacement within 90 days of the original purchase date. Please contact me to initiate a return for a defective item.
Non-defective items: If you are not satisfied with a non-defective item, you may return it for a refund within 30 days of the original purchase date. A 20% restocking fee will be deducted from the refund amount, to offset the time and inconvenience, as I am the sole employee processing the return and restocking the item. The fee also covers the costs associated with processing the return. Refunds for non-defective items will be issued through the original payment method.
Preordered items: Due to the nature of preorders, delivery dates are subject to change. Please keep in mind that, If you have preordered an item, it is not eligible for a refund until after it has arrived at the store. Once the item arrives at the store and is inspected, you may request a refund within 30 days of the original purchase date. Please note that refunds for preordered items may take up to 10 days to be issued.
To initiate a return, please open a ticket on the shop’s discord channel, with your order number and the reason for the return. We will provide you with further instructions on how to return your purchase.
Thank you for shopping with us. If you have any questions or concerns, please don't hesitate to contact me, via Discord.
Order alterations and cancellations:
Once an order has ben submitted, no alterations can be made. This includes adding or removing items or canceling orders. You are welcome to return an order, once you have taken receipt, following the returns procedure listed above.
Shipping:
US Shipping is via UPS or USPS. The way it is set up shows the least expensive options for standard, priority and express shipping. I can not take special requests for specific carriers at this time.
International shipping is mostly UPS, as I utilize Zonos/UPS integration to tally extremely accurate import and shipping costs.
I require a telephone and email with international orders and you must make yourself available to the carrier or your customs, should they require more information. If you are unreachable and the package is discarded or rerturned, I will not be responsible for rerturning your shipping cost.
If there is a problem with an international order, it is my choice to refund part or all of the order, or send a replacement.
Addresses are verified through Shopify, but the customer is still responsible for inputting their address in the correct format. Any returns or lost shipments, due to incorrectly addressed packages, are the responsibility of the customer.
