UPDATE 2/1/16 - 7/25/2017

After a week or 2 of using the new 3d printed carriage I move the other 2 to 3d printed carriages as well.

I'm happy to rapport that after over a year of ~ 1350 hours of printing the 3d printed carriages have printed very well.

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So one of my carriages for my MR12 rails started to bind up on me, doing some research on commercial linear rail glide options, I discoverer http://www.igus.com/

They have a DryLin® T - profile rail guides (http://www.igus.com/wpck/3555/drylin_t), line that looked perfect for my application. thou with quite the price tag.

looking over some options, I found iglide® tribo-filament for 3D printers.

using this i was able to create an fulley 3d pirnted adjustable clearance rail carriage.

you will need print out of iglide

1 TopSlide.stl

2 SideSlide.stl

I found that printing at around 230c hotedn and 80c bedtemp 20mm/s works best. Also print one at a time! helps to press some kapton tape down to help sticking. its a pane to get just right, but once you do you will get some very good slides!.

for the Carage.stl, SlideLock.stl, DeltaCarage.stl; print at 2mm 30% infill, using PET+ (http://shop.madesolid.com/pages/pet-filament)

some hardware is need needed.

6 Socket Head Cap Screw M3 Thread, 6mm Length

4 Flat-Head Socket Cap Screw, M3 Thread, 4mm Long

I sourced my iglide® tribo-filament form Amazon.

http://www.amazon.com/gp/product/B00M92IDT2

NOTE!!!

the DeltaCarage.stl is just the Carage.stl with added delta arm mounts for kolossal pro (40mm from edge to edge), belt lock,and end stop screw mount howl.