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Dove-tailed press fit LM8UU X-carriage

by Wired1, published

Dove-tailed press fit LM8UU X-carriage by Wired1 Sep 28, 2012

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Summary

X-axis carriage with unbreakable LM8UU holders dove-tailed into the carriage - no screws required :)

Suits a Mendel Prusa, Mendel Max, Mendel Pro or any printer with 50mm spaced x-axis.

Also features fore and aft fan holders for my VGA fan holder http://www.thingiverse.com/thing:29158, wire loom anchor points at the rear and integrated one-sided belt clamp for T5 or XL belts.

Check back for the quick fit extruder mounts I am working on next.

I have also included the bearing holder clearance file I used to make the carriage if anyone else wants to have a go at this type of assembly, it automatically creates a gap of 0.25mm to allow the two parts to slide together.

30 September - Updated version XC3.6 with added material to prevent warping. Also has additional mounting points for my quick fit extruder hardware.

Quick fit latch here: http://www.thingiverse.com/thing:31528

Instructions

Print out four of the bearing holders, one carriage and two belt clamps.

You need to have your printer calibrated to print the close tolerance parts and you will want to accurately measure your filament size prior to slicing to get this to work correctly.

Run a 3mm drill through the machine screw holes and it's good to go.

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My bearing holders slide in OK, but they are not particularly snug.  I'm worried about them shifting while printing.  I'm thinking of securing them with a very small dab of epoxy.  I guess it would be advisable to do so while the whole carriage assembly in actually on the X Axis bars so that I can assure perfect alignment

It is a close tolerance fit on my printer but I did have one loose corner on my prototype too so I put a drop of glue under itlike you suggest and it has never moved since. Yes the trick would be to slide the rails through when you are doing this to help everything align better.

Added GT2-3 belt clamps.

Hi can you upload your files in step i would like to use your carriage in my new printer design

Up now, sorry I only just saw your comment :)

Every iteration you come up with just gets better and better.

Thanks Justin, I'm not sure this one was an improvement, it is a bit fussy to print it. The one I printed has a slight warp in it so I will have to add ome more material in the middle.

I like the more robust version of this x-carriage.  nice thing.    May I ask why the LM8uu holders are separate and are not just part of the top plate and one print?

They need to be printed sideways to be strong otherwise they will snap along the grain when tightened up. If you could print the whole carriage on end it would be OK but it would be tough to design and tall to print.

Thank you. I thought there had to be a reason.  

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