Adding an Openbuilds Openrail x axis to a Lulzbot Taz 4/5

I am looking to do this to my X-axis, I was wondering if the parts and quantity I have selected are right. Also what length does the Linear Rail need to be? I assumed I would have to buy the 500mm and cut to length being the rods I have are 500mm and stick out a bit. Any other parts I should purchase? Also a list of hardware would be nice. I have various M3&M5 screws and nuts but want to make sure I have enough on hand. Thanks in advance.


EDIT: Did a search and found this post: https://forum.lulzbot.com/t/adding-an-openbuilds-openrail-x-axis-to-a-lulzbot-taz-4-5/1854/38

Looks about right, the gantry plate pictured is the smaller one, you’ll want the larger one. you also may want a few extra of the 6mm non eccentric spacer for the middle bracket posts. You will also need the low profile head bolts from them as well, otherwise the heads of the bolts will hit the extruder carriage mount plate.

Great! I am still debating whether or not to do this upgrade, but about $50-70 of parts isn’t too bad. Do you happen to know how long you cut your 500mm rails down to?

You need to remove 64mm from the end of the X rail. The cut should be clean, but you have +/- 5 or so mm adjustment in there if you need it either way. A cut with a standard hacksaw in a miter box works fine. Or a chop saw. The end pieces allow for some adjustment. The Y rails should be fine as is, though I did have one report of a user that had to remove 5mm from each of them as well. I did not have to modify my Y rails or Z rails.

The quality improvement in print surface from this and the Y axis modification is substantial.

On my Taz 5, I had to cut the Y rails to fit. Use a fine toothed chop saw if you can. Comes out super smooth and professional looking

Thank you! This one works great



You might consider running two wheels on the top instead of one like you have it, just so if one of the wheels slips out of alignment during a print, you have some redundancy. I’ve only had one of the cams move at all in the 4 months I’ve been running it, and the bolt was too loose, but it could be a concern. A 3 wheel arrangement definitely will save weight though. Looking nice so far!

Piercet, there are several issues with the files on thingiverse for the X-Axis. Lots of self intersection and non manifold sections. S3D is having a hard time with slicing and netfabb won’t clear it all up. Can you check it when you get time?

I’m a little confused as to how I create the backplate. Do I print one myself?

Also, any plans to move forward with a kit for the upgrade?

Which parts specifically?

There are 3 backplate variants, 2 printable and 1 milled version. The milled version you would need to cut on a CNC mill or shape by hand. The printable ones are a little heavier but can just be printed.

There are plans in the works to release a kit version, I’ll have more information about that in the next few weeks hopefully.

Idler endcap, X Motor endcap, Mainblock. It would appear there is some hidden geometry on the blind holes on the endcaps.



Ok, let me take a look if something got corrupted with the upload files. Thanks for the notice.

I see the sections its mad about, They should slice anyways, but I’ll go ahead and fix them and re-upload. It’s basically just an extrusion that should intersect, but is around 0.0000000001mm off.

Here is how the mainblock and one endcap slice…


Try this mainblock file when you get a second please, the others are in progress.
Taz_Openrail_xmotor_Mount_mainblock_2_0_a3.stl (374 KB)

Here is a slice from about halfway up. You can see the lower of the two holes has been opened on this one. The internal geometry is still present.


And the same file viewed in sketchup with the bottom removed

Argh, ok, well try the X motor mount fix instead while I re fix that one.
Taz_OpenRail_XMotor_Endcap_8_4_c.stl (200 KB)

Perfect!

Also see if this works now. Rebuilt the wall all the way down and rebored the holes
Taz_Openrail_xmotor_Mount_mainblock_2_0_a4.stl (347 KB)