P3steel 2.x - Y-axis idler

by toolson, published

P3steel 2.x - Y-axis idler by toolson Sep 23, 2015


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This is a Y-axis idler for the P3steel 2.x.
Designed for use with 2 pieces MF126 bearings.

This part corrects the geometrical failure of the original part.
The belt will run perfectly horizontal and parallel when used with a 20teeth pulley.

This part is a remix of my first idler and now compatible with P3steel 2.x versions. It's now more rigid and precise.

It's the next part of a complete series for P3steel parts.
I redesigned every part based on my long time experience with the P3 steel.

Please share your makes!


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Works great for me, thanks for sharing. I used an M5 screw as that matched the idler that I had. It took a bit of work to clean up the inside to fit the idler in, but I think my printer had just been a bit over-enthusiastic with support material. Thank you!

Thanks ... but ... all of my parts are printable without support material!

You are using an M6 screw? because by default I got an M8

Could you please give me the printer settings to be used?
Thank you

Is there an advantage to using the the flanged bearings over using a matched 20 tooth timing belt pully such as this:https://www.amazon.com/gp/aw/d/B0188HW4Z0/ref=psd_mlt_nbc_B0188IFK4Q_b

if running high belt tension ...a smooth pulley will damage your belt teeth (compressing those teeth, compression set). I have printers with both smooth and toothed idler pullies .. I use toothed pulley idlers with steel corded GT2 belts which require very high belt tension.

I tested this long long time ago. I didn't see any difference.

The MF126 bearing is a good choice and matches the OD of a 20 tooth GT2 pulley.
I got the MF126 bearing here: http://www.amazon.com/gp/product/B00HHHDQLE?psc=1&redirect=true&ref_=oh_aui_detailpage_o08_s00
& belt + pulley here: http://www.aliexpress.com/item/Free-Shipping-2Pcs-20-GT2-6-GT2-Pulley-And-2m-GT2-6mm-Open-GT2-Belt-for/1952469633.html The MF126 is flanged with two making a good guide for the G2 Belt.

It makes the belt parallel with y axis of the bed. With a stock p3 idler it is not parallel. I used toonson's y axis belt tensioner too.

Why is the inset for the M3 nut so large? I fit a M3 nylon lock nut in there. I wedged a driver into the slit with the nut and used that as a flat to tighten down the nut. I think that size should be reduced in next version or maybe I'm not understanding the conceived build completely.

The insert size is absolutely correct. If you have some space left you don't have a precise printed part or the wrong M3 nut.

I wasn't understanding the design. I didn't see the nut press fit inside of that access point. Yes, that press fit looks to be of the correct size. I thought we were just using the side walls of the access point (which I thought was the inset) to keep the nut from spinning kind of like how we attach the p3 steel metal parts together. I might remount it a little later.

Nice work on this. I appreciate that you got a y-tensioner implemented on the y-axis without compromising the y travel distance and while making the belt parallel with the axis.