Prusa Steel Leadscrew X-Axis system

by FireTora, published

Prusa Steel Leadscrew X-Axis system by FireTora Mar 13, 2016
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When upgrading my P3Steel with some Z-Axis lead screws I couldn't find any system I really liked. I liked toolson's X-axis system but it uses the standard threaded rod. Based the main dimensions off of MazaaFIN's Smooth X-axis, added a mounting point for toolson's Z-axis endstop trigger, and made 2 different tensioner's.

Designed for 8mm lead screws using the T8 nuts with a 17mm center-to-center distance between the linear rod and lead screw. The tensioner's use M5 bolts and nuts, one variant uses a M5 square nut instead of a hex. Everything else should be standard M3 stuff. This should work with any X-Axis carriage if it keeps with the original linear rod spacing.

Currently in the process of printing to verify it works well.

Update: Clearances are super tight on the models, Linear bearing slot is 15mm diameter, lead screw nut is 10.2mm and X-axis rod holes are 8.1mm. Also forgot to make the slot on the [x_axis_tensioner_with_pulley.xtl] big enough to get the pulley in in the first place. It might still work if you're not the using 18mm diameter toothed idler. I'll be fixing the tensioner in the next couple days and will either upload some other parts with bigger clearances or just the model file so people can adjust to their needs.

Update 2: Fixed the tensioner with pulley so it now has a opening in the back as large as the cutout, also uploaded all the solidworks files. Got it set up on my P3Steel with the two piece tensioner a few days ago and it works great.

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HI. Great design, currently printing I'm bit confused about idler parts: why there are so many of them? Also, what pulleys / gears / bearings is this designed for?

For what size lead screws will this work?

I used a 8mm Acme lead screw

Did you modified the top of your P3steel to fit the M8 Leadscrews ?
Can you make a photo please ?

I didn't. I've got the Orballo frame as well and my lead screws stop just at the top holes where the rods can go through.

I didnt have to.

I will try http://www.thingiverse.com/thing:1841693 when I will receive my leadscrews.

P3Steel Top Lead screw holder with 608zz
by xfifi

I should mention that i bought my P3steel at Orballo. But in my limited experience in Z axis holders is that they tend to induce Z wobble. Usually both ends are not constrained (Flexible couplings). If in a non-ideal (read not perfectly aligned and linear) system one end is restrained the other end is forced to move about to due to the imperfections and this might move the nozzle in the X and Y axis if bearing play allows it.

(Which it could depending on the bearings you use. In my case Igus bearings which are over-tightened in these parts without play introducing backlash in the Z-axis or have some bearing play. I opted for bearing play as under extrusion after Z-hops due to blacklash led to many failed prints/weak parts. This could be attributed due to the fact that i printed the X axis parts in PLA and that PLA is not flexible and unable to give a proper cylindrical press fit to the bearings. And that is the reason i am actually setting up a print job right now to print in ABS hoping to take advantage of the higher flexibility and temperature resistance of ABS.)

I printed the motor side and noticed that only 2 of the 3 holes go all the way through. What are you using as a fastener on the hole that doesn't go through?

Are you talking about the lead screw nut mounting holes? I just threaded the screws into the print itself.

Are these x-axis parts compatible with toolsons? Since you mentioned the dimensions were used from a different collection of parts this was not clear to me.

(With compatible i do not only mean the Z-endstop, but also X-endstop/carriage/extruder and smooth-m8 threaded rod distance compatible.)

Yeah, all of toolson's X-axis parts work. The carriage rod distance is the standard i3 distance so most i3 carriages should work.

Sorry, can you say me the z end stop that you use.

I'm using Toolson's Z-axis endstop parts.

P3steel 2.x - Z-axis endstop mount
by toolson

I found that my Z-endstops did not line up with the endstop triggers mounted on the X axis. I modified toolsons X axis trigger so it does actually trigger the microswitch now. (ATM still in process of refining the design, but busy printing other parts now)

hi, you know if work with this carriage of toolson edition

His carriage does work with this. The smooth rod spacing is the standard i3 spacing, so almost all the X carriages should work.

Do you see a big improvement compared to regular M8 thread?

Print quality is identical, but I no longer have to worry about the threaded rod wearing out or making a ton of noise.

Good to know, cheers!