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Best print head mount option on X-axis

Posted by DanL 
Best print head mount option on X-axis
August 17, 2019 10:40AM
Bought an assembled Folger Tech FT5-2 printer with a custom extruder/hot end mount.....shown as "current" in the attachment.
It introduces a bit of wobble at the nozzle.
I want to minimize that wobble by adding a second linear bearing/rail. Three options I'm considering are shown as A, B and C in the attachment.
What might be the best way to go... A, B, C? I'm thinking "B". Or another approach?
Thanks much.

Edited 1 time(s). Last edit at 08/17/2019 10:43AM by DanL.
Attachments:
open | download - new x mount.jpg (346.7 KB)
Re: Best print head mount option on X-axis
August 17, 2019 12:04PM
One linear guide should be enough. It has two rails/bearings built in, so is equivalent to setting up two rails in parallel, except that in the linear guide they are better aligned than you could ever hope to set two independent rails.
Linear guides aren't supposed to have any play in the bearing blocks. Cheapo guides used in kit printers in which the appearance of quality is more important that the actual thing, often have sloppy linear guides.

Have you considered replacing the crappy linear guide with a decent one that doesn't wobble? I have two printers with single linear guides for the X axes and there's no wobble in either. I used high quality, Japanese-made linear guides bought via ebay for very reasonable prices (but probably slightly more than a crappy hiwin knockoff).

Here's one: [www.ebay.com]
and another: [UEAAOSwySlaS-3K" target="_blank" rel="nofollow">www.ebay.com]


Son of MegaMax 3D printer: [www.instructables.com]
Ultra MegaMax Dominator 3D printer: [drmrehorst.blogspot.com]
Re: Best print head mount option on X-axis
August 17, 2019 02:35PM
Quote
the_digital_dentist
...Have you considered replacing the crappy linear guide with a decent one that doesn't wobble? I have two printers with single linear guides for the X axes and there's no wobble in either. I used high quality, Japanese-made linear guides bought via ebay for very reasonable prices (but probably slightly more than a crappy hiwin knockoff)....

Duh....I should have thought of that....great idea. I don't think I want to buy the used ones listed though. What are some "high quality" brands that I can check out? I need a 40cm long rail.
I will likely try one of the configurations I show since I have a couple extra guides (crappy ones) on hand.

Will post my observations.

Appreciate your fast response...thanks.
Re: Best print head mount option on X-axis
August 17, 2019 04:17PM
You did not specify what type / kind of extruder / hotend you will be using?
Direct, Bowden, ---- looks like E3D Titan

Original FT-5 hung extruder / hotend below a horizontal linear rail



713 maker makes a beefy aluminum mount

[713maker.com]

"I will likely try one of the configurations I show since I have a couple extra guides (crappy ones) on hand."

It appears your designs were a forgone conclusion?

Will you be milling / printing your own brackets?

confused smiley
Re: Best print head mount option on X-axis
August 17, 2019 07:05PM
Quote
cozmicray

It appears your designs were a forgone conclusion?

Will you be milling / printing your own brackets?

confused smiley

Yep E3D Titan.
Geez....sharing my thoughts on options...not foregone conclusions. Design options I show use cheap, simple 1.5" x 1/16 aluminum angle. Drilling a few hole patterns is all that's required, so easy to test different approaches.
Will try different approaches that might be promising.
The original FT design sucks, even as presented by 713 maker. I had that and it's a wobbler. Take a look at the distance from point of swing (I call it "Center Of Wobble") at the guide rail to the tip of the nozzle. The farther that distance, the farther the wobble arc becomes at the nozzle tip. The FT design absolutely maximizes that distance, especially on the longer Volcano setup.
I'm trying to tuck the nozzle tip as close to the C.O.W. as possible. Also gains maybe 50mm Z height vs FT design. Just experimenting....and asking for thoughts.
I'll post details after experimenting for a while.

Edited 3 time(s). Last edit at 08/17/2019 07:18PM by DanL.
Re: Best print head mount option on X-axis
August 17, 2019 08:54PM
Digital Dentist....Mark R....
Just realized you are one and the same....another DUH on my part.
Hit your blog on this topic without realizing the duplication
Sorry.
Re: Best print head mount option on X-axis
August 18, 2019 09:15AM
THK, NSK, IKO, Bosch, Rexroth, Thomson are all quality brands. So is HiWin, but there are a billion knockoffs of HiWin parts so you never know if you're getting real ones unless you buy directly from HiWin which would probably be too expensive. Buying any of the quality brand parts new will be very expensive. You can often find new-old-stock listings for quality parts on ebay- you just have to look through a lot of too-expensive stuff and be patient - new listings show up hourly, so if you don't see something that will work today, you might see what you need tomorrow.


Son of MegaMax 3D printer: [www.instructables.com]
Ultra MegaMax Dominator 3D printer: [drmrehorst.blogspot.com]
Re: Best print head mount option on X-axis
August 19, 2019 08:28AM
Thank you.
I've made up a new mount to test....option A. Surprisingly, it slides very smoothly after some tweaking of rails. Need to test at elevated chamber T, then will attach belt and test print.
Will post observations.
I will be looking for a high quality linear guide for the X when I get more time in November. I'm finding that I like to tweak the printer as much as actually printing.
gtj
Re: Best print head mount option on X-axis
August 19, 2019 06:19PM
Quote
DanL
I'm finding that I like to tweak the printer as much as actually printing.

Welcome to my world. smiling smiley
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