Emphacy's Minimal Leadscrew Upgrade

Last crawled date: 4 years, 2 months ago

This is a remix of the original Hobsie's Parametric Leadscrew Upgrade designed to prevent bending of the Z rods. You can preview and download the source at https://a360.co/2HHakJK
Changes
Improved the idler design so the tension is placed onto the X rods instead of the Z rods. This also allows you to slide out the X rods without disassembling the entire Z axis.
Redesigned the idler so it's on the outside of the axis (more room for carriage on the inside). There are two versions for pulleys with 3mm/5mm bore bearings.
Reduced the number of holes for the Trapezoidal nuts as only two are required.
Replaced the Z endstop bolt hole (not needed for probes) with a modular hole instead.
Parameters
There is a parameter in the Fusion design which changes the distance between the rod and leadscrew. The default is 17mm which is appropriate for the Prusa i3 (all versions) and the P3Steel. If you own a P3Steel XL you'll want to change this to 18mm. The STLs are at 17mm.
Components
4x LM8UU or Igus RJUM-02-08
2x M3 Self Locking Nuts
2x M3 Standard Nuts
2x M3 Bolts (recommend 20mm)
Questions
Q: Can I use anti-backlash nuts with the leadscrews?
A: No. They will not fit and you don't need them anyway. Earth has 1G gravity.
Q: How do I add a Z endstop bolt?
A: Design and print a mount for the bolt and screw it into the modular hole at the bottom of the motor side.
Q: How do I tighten the Idler / Tensioner?
A: Turn the bolts counter-clockwise. You may need to add some force to stop the pushers rotating at first but once there is enough tension they'll stop rotating.