Mendelmax y-axis 180 degree bearing retrofit

by dreameredeemer, published

Mendelmax y-axis 180 degree bearing retrofit by dreameredeemer Nov 5, 2012
0 Share
Download All Files

Thing Apps Enabled

Order This Printed View All Apps


Liked By

View All

Give a Shout Out

If you print this Thing and display it in public proudly give attribution by printing and displaying this tag.

Print Thing Tag

Thing Statistics

3678Views 436Downloads Found in 3D Printer Parts


In case you haven't heard, the mendelmax 1.5 y-axis suffers severely from being overconstrained; for an excellent explanation of what this means and how to fix it in general, see bilsef's post here: http://goo.gl/U2XJN

The gist of it is that one of the rods needs to be constrained only vertically, by a setup alternatively called an idler, follower, or 180 degree bearing. Using cartridge roller bearings for this is slightly less than ideal since they're not designed to take a point load (effectively), especially on the outer shell... but an abuse of spec with the risk of rapid wear is better than an entire machine being completely useless if you ask me. At any rate, this makes the laser cut carriage glide freely as it should.


You'll need some approximation of the following hardware:
2 m6x30 hex cap bolts
4 m6 nuts
4+ m6 washers
2 606 bearings
2 m5x20 allen cap bolts
2 m5 lock nuts
4 m5 washers

Print the part. The scad is mostly parametric, so you can adjust things as necessary (further fiddling may be necessary). 606 bearings are the biggest usable OD--they just barely rub the insulation.

Install the bearings on the printed part. Pull the idler rod and remove the bushings, then mock up the fit and mark/outline where it will go; it will end up about center in both dimensions. The part can rotate 10 degrees to close a gap in case the bearings are too far apart. Pull the crossmember and drill holes as per your marks. Mount the part to it (you'll want to install them opposite of what's in the picture so that you can get a wrench on the nut) and reassemble, reinstall the carriage. Push it back and forth over and over, basking in the glory of a carriage that glides so nicely.

Next steps are to design a new belt clamp positioned as close as possible to the bushinged rod aka master rod. Then make sure your x-axis isn't overconstrained in the same manner the y was (many x carriage designs are overconstrained). The z-axis is a little different; having bushings on the idler side x rods somewhat decouples the z rods in that dimension, so even though it looks like the y-axis, z isn't overconstrained.

Despite all this, I'm probably going to end up buying (grudgingly) the new y-axis kit, mostly because the 8mm rods aren't thick enough to handle the weight of the aluminum plate.

More from 3D Printer Parts

view more

All Apps

3D Print your file with 3D Hubs, the world’s largest online marketplace for 3D printing services.

App Info Launch App

Auto-magically prepare your 3D models for 3D printing. A cloud based 3D models Preparing and Healing solution for 3D Printing, MakePrintable provides features for model repairing, wall thickness...

App Info Launch App

Kiri:Moto is an integrated cloud-based slicer and tool-path generator for 3D Printing, CAM / CNC and Laser cutting. *** 3D printing mode provides model slicing and GCode output using built-in...

App Info Launch App
KiriMoto Thing App

With 3D Slash, you can edit 3d models like a stonecutter. A unique interface: as fun as a building game! The perfect tool for non-designers and children to create in 3D.

App Info Launch App

Print through a distributed network of 3D printing enthusiasts from across the US, at a fraction of the cost of the competitors. We want to change the world for the better through technology, an...

App Info Launch App

Quickly Scale, Mirror or Cut your 3D Models

App Info Launch App

3D Print a wide range of designs with Treatstock. Easy to use tools to get the perfect result. The global 3D printing network that connects you with high-quality and fast working print services nea...

App Info Launch App