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RHDreambox
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Re: Upgraded Y axis belt tensioner

Feb 11, 2018 8:52 am

Honestly I have no idea why that is happening. I exported the file the same way I did the others. Just for frame of reference if you want to scale it down, the washer is 7.5 mm in diameter. any input as to why this is happening?
Matthew, check these settings in Inventor, then the STL files will be correct.
Export STL dialog box and Document settings units.
Attachments
STL-dialog box.PNG
Export to STL
STL-dialog box.PNG (7.53 KiB) Viewed 379 times
Documents settings dialog box.PNG
Document settings
Documents settings dialog box.PNG (9.45 KiB) Viewed 379 times
Happy owner of a Prusa MK3

matthew.v8
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Re: Upgraded Y axis belt tensioner

Feb 11, 2018 1:59 pm

curtis.c2 wrote:
Feb 11, 2018 5:09 am
this looks really slick.

I was frustrated at that part of the install and just put some extra long bolts onto the pulley holder so I could easily slip the belt on and then use the bolts to tighten it.
Cool, this is exactly why I designed this. Having the idler relying on the two long bolts holding the mount seems like it could get frustrating.

RHDreambox - I will definitely check those document settings. Thank you for your upgrades for the prusa also!!

jweaver
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Re: Upgraded Y axis belt tensioner

Feb 11, 2018 10:09 pm

I just printed a set and will make it up tomorrow night to see what it look like

How loose should the 'barrel' be in the large hole? For me its too tight to get it through, so i am going to have to file it out a bit.. Should I aim for it to be a snug fit, or does it matter if its a bit floppy.

Also, the M3 holes on the sides are a bit small.. My printer (Printrbot) always tends to flatten them a little, but had no problems with the official Prusa parts and other upgrades.. But yours are really small.. So I think I might have to drill them to size...

matthew.v8
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Re: Upgraded Y axis belt tensioner

Feb 11, 2018 11:48 pm

jweaver wrote:
Feb 11, 2018 10:09 pm
I just printed a set and will make it up tomorrow night to see what it look like

How loose should the 'barrel' be in the large hole? For me its too tight to get it through, so i am going to have to file it out a bit.. Should I aim for it to be a snug fit, or does it matter if its a bit floppy.

Also, the M3 holes on the sides are a bit small.. My printer (Printrbot) always tends to flatten them a little, but had no problems with the official Prusa parts and other upgrades.. But yours are really small.. So I think I might have to drill them to size...
There was an updated version of the frame mount piece. I hope that you saw that update. The hex holes were too narrow on the originally posted model.

I noticed that the m3 holes were a little tight on my printed pieces due to elephants foot. After I cleaned up a little flashing they were snug. The barrel should be able to rotate slightly as it’s adjusted. It can be a little on the looser side considering once it’s under tension it shouldn’t move.

The middle holes should be slots (see the first page to see the slots I’m referring to). The lower pivot holes are supposed to be for a 3mm pin on the adjuster arm. Only one side of the adjuster arm has a thru hole. The other side is counterbored so the pin stops at a certain point.

matthew.v8
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Re: Upgraded Y axis belt tensioner

Feb 14, 2018 4:12 pm

Alright, so I redesigned the y axis adjuster arm so now there is less to print and the print itself should be easier. The adjuster barrel isn't used anymore and I don't think the spherical washer is 100% necessary. I've kept those files as well as the original files in the the thingiverse link in case anyone wanted to experiment with them. See the attached screenshot. All originally used hardware remains the same. Once I finish printing my test piece, I will remove the work in progress tag on the thingiverse page.
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Y AXIS ADJUSTABLE BELT TENSIONER v2.JPG
Y AXIS ADJUSTABLE BELT TENSIONER v2.JPG (24.21 KiB) Viewed 223 times

jweaver
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Re: Upgraded Y axis belt tensioner

Feb 14, 2018 4:30 pm

matthew.v8 wrote:
Feb 14, 2018 4:12 pm
Alright, so I redesigned the y axis adjuster arm so now there is less to print and the print itself should be easier. The adjuster barrel isn't used anymore and I don't think the spherical washer is 100% necessary. I've kept those files as well as the original files in the the thingiverse link in case anyone wanted to experiment with them. See the attached screenshot. All originally used hardware remains the same. Once I finish printing my test piece, I will remove the work in progress tag on the thingiverse page.
Nice update.. goimg to use this for sure.. one question, why a 3mm pin for the top hinge, where as a long bolt with locknut would be easier to source.

I do have some pins that i bought becuase the one supplied for the Bondtek idler was too short.. but they are a little short for your application.

I was considering using the ones I have, or buying some longer ones.. but it makes more sense to use a nut and bolt.. is there anything i am overlooking?

matthew.v8
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Re: Upgraded Y axis belt tensioner

Feb 14, 2018 4:56 pm

jweaver wrote:
Feb 14, 2018 4:30 pm
matthew.v8 wrote:
Feb 14, 2018 4:12 pm
Alright, so I redesigned the y axis adjuster arm so now there is less to print and the print itself should be easier. The adjuster barrel isn't used anymore and I don't think the spherical washer is 100% necessary. I've kept those files as well as the original files in the the thingiverse link in case anyone wanted to experiment with them. See the attached screenshot. All originally used hardware remains the same. Once I finish printing my test piece, I will remove the work in progress tag on the thingiverse page.
Nice update.. goimg to use this for sure.. one question, why a 3mm pin for the top hinge, where as a long bolt with locknut would be easier to source.

I do have some pins that i bought becuase the one supplied for the Bondtek idler was too short.. but they are a little short for your application.

I was considering using the ones I have, or buying some longer ones.. but it makes more sense to use a nut and bolt.. is there anything i am overlooking?
Thats another thing I’ve been going back and forth with but used the pin for two reasons. First because I didn’t want the end user to over tighten the pivot point. I wanted to make it “screw up proof”. Second and less important was because of the way the extruded idler was designed. I also included the step files, this way someone can make the modification if they wanted themselves. Maybe I can add an additional version for those who don’t want to use the pin.

peter.h33
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Re: Upgraded Y axis belt tensioner

Feb 14, 2018 4:58 pm

Matthew is there a new link to thingyverse or just use the same

jweaver
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Re: Upgraded Y axis belt tensioner

Feb 14, 2018 5:04 pm

matthew.v8 wrote:
Feb 14, 2018 4:56 pm

Thats another thing I’ve been going back and forth with but used the pin for two reasons. First because I didn’t want the end user to over tighten the pivot point. I wanted to make it “screw up proof”. Second and less important was because of the way the extruded idler was designed. I also included the step files, this way someone can make the modification if they wanted themselves. Maybe I can add an additional version for those who don’t want to use the pin.
Makes perfect sense.. The nyloc nut would simply be used to top the bolt from falling out and would just have to be nipped up until there was no movement of the bolt.

I think i will use the nut/bolt instead of buying a pin, and will drill out the holes to accommodate it and allow it to swivel without binding, rather than re-print

But it would good to have a version which uses a nut/bolt for others, as I think this is an easier solution than a pin.

Jon

matthew.v8
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Re: Upgraded Y axis belt tensioner

Feb 14, 2018 5:07 pm

jweaver wrote:
Feb 14, 2018 5:04 pm
matthew.v8 wrote:
Feb 14, 2018 4:56 pm

Thats another thing I’ve been going back and forth with but used the pin for two reasons. First because I didn’t want the end user to over tighten the pivot point. I wanted to make it “screw up proof”. Second and less important was because of the way the extruded idler was designed. I also included the step files, this way someone can make the modification if they wanted themselves. Maybe I can add an additional version for those who don’t want to use the pin.
Makes perfect sense.. The nyloc nut would simply be used to top the bolt from falling out and would just have to be nipped up until there was no movement of the bolt.

I think i will use the nut/bolt instead of buying a pin, and will drill out the holes to accommodate it and allow it to swivel without binding, rather than re-print

But it would good to have a version which uses a nut/bolt for others, as I think this is an easier solution than a pin.

Jon

Exactly. I can add the other version in about a half hour or so.

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