CR-10 Dual Z axis with single stepper. Low cost high precision.

thingiverse

The CR10 boasts an impressive single Z axis leadscrew, producing superb prints without any issues for me. From an engineering standpoint, however, it would be even better to feature leadscrews at both ends. Fortunately, there's an upgrade kit available that incorporates a second stepper motor, but I understand these can sometimes get out of sync when power is switched off and on, requiring the bed to be re-leveled every time. My solution cleverly links the screws with a toothed belt and is driven by the existing single stepper, eliminating any risk of getting out of sync. The total cost for all necessary parts comes in under £12.00 (US $16.00), including delivery! While there's some metalwork involved, you'll only need a saw, file, and drill to complete it. If you're not confident in your metalworking abilities, I've designed a printed bracket with the same dimensions - although please note that this has yet to be tested. To get started, you'll need: * A 600mm leadscrew and nut (available at https://goo.gl/fM8znL) * Two GT2 Aluminum timing belt pulleys with 36 teeth and an 8mm bore (found at http://bit.ly/2DXpmch) * A GT2 852mm Timing Belt, ensuring you select the correct length (accessible at https://goo.gl/iXa4sv) * A Flexible Shaft Coupling (available at https://goo.gl/qfUhEe) * Bearings (located at https://goo.gl/HnzTqr) For a comprehensive guide on installing this upgrade, be sure to check out the video tutorial at https://youtu.be/-ASBhJiU8NI and follow the step-by-step instructions available at http://myfordboy.blogspot.co.uk/p/the-cr10-has-single-z-axis-leadscrew.html. When ordering your leadscrew, make sure to purchase from the link provided, as there are two different forms of 8mm leadscrews available. One features a 4-start thread, resulting in an 8mm travel for one turn, while the other has a single start that would move the nut 2mm per turn. I made the mistake myself initially and ordered the incorrect type. UPDATE: Some users have reported that the printed bracket fits perfectly, but others have noted that the fixing holes are too close together. To address this issue, I've uploaded an updated file featuring a slot to ensure proper fitment.