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Ovals-be-gone! Y-belt tightener for Printrbot by SVAPS. For T5 and T2.5 belts.

by SVAPS, published

Ovals-be-gone! Y-belt tightener for Printrbot by SVAPS. For T5 and T2.5 belts. by SVAPS Feb 15, 2013
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Summary

I wanted a tensioner that would attach to the bed using the supplied two screws and that was easy to mount and which would enable tightening of the belt without tools and without risk of damaging the belt, as with some of the tensioners where the belt is tensioned with a screw directly on the belt or where the belt has to turn a sharp corner.
Also I wanted the thing not to be too large or require too much ABS.

Added an STL for a T2.5 belt - I have not tested this, so please report any misbehavior.

Instructions

Print the three parts.
Remove the mounting screws from the bed with the previous mount.
Place the base (green part) on the under-side of the bed with the rectangular tab facing away from you.
Thread the screws through the holes in the bed from above as before and through the holes in the base.
Grab the nobbly side of the belt with the nobbly side of the grabber (orange part) and slot the belt and grabber into the groove in the lid (Blue Part) with the smooth side of the belt against the long side of the groove.
Press the lid against the base and tighten the screws into the lid (Nuts should not even be necessary).
Insert and tighten an M4x40 or 50 mm into the grabber and keep tightening until your belt is taut.

  • And you will have no more round holes come out as strange ovals :-)

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The one labeled for 2.5mm seems to be for 2mm, and my printrbot LC
can't print with enough details to do the grabber right anyways :(

Hi, excellent part, will it work with the T2.5 belt?
Thanks

Just posted a grabber for T2.5 belt. Please let me know if it works!

Hi, that was fast, I'm going to print it and try :) THANKS :)

Hi Rechena,

Thanks :-)
This version is for T5. To make one for T2.5 belts the "grabber" would need to be modified with teeth fitting the T2.5 belt.

I will try and make one.

Hi,
I've tried to slice it on the Slic3r and it "trys" to fix an error on the part and just makes a block it skips the "dented" part... Any clues?

Now the part has been repaired netfabb and Slic3r can get the dented part.

Hi,
Yes. I neglected to check the part for errors in netfabb. Will do it later today i hope. By the way netfab is highly recommended since it can fix most defects in stl files even with the free version.
I use sketchup to make things and it almost always makes faulty stl files.

Hi there, sorry about the non reply after you posted the part, I've tested it now and it works perfect, I've been away from printing for some time.

Now I'm having a different problem the Y_tightener_Base breaks constantly from the pressure of the screwn :/ I'm already on my third print to replace, is there a way to reeinforce it?

Thanks again.

Yep, I have the same problem with sketchup... thanks for this :)

I LOVE you!! Works beautifully!

Nice!! <- two thumbs up

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