This version is a remix from the 2019 original from Thingiverse.
https://www.thingiverse.com/thing:2786671/files

I made an effort to upgrade and remix it cause I Think this is easy, and far away, the best Y-Tensioner Mod for prusa. Only one bolt to adjust tension.

See the Complete Install Guide below this info!!!! Dont miss it !!!


Compatible With:
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• Prusa Mk3
• Prusa Mk3s
• Prusa Mk3s+
• Other Printers

Upgrades:
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• Hex holes are tight, hex nuts dont fall off when you are installing the mod.
• LockNuts dont turn inside the hole when you are aplying tension.
• Block-TNuts and M3 Hex Heads are HIDDEN inside the frame (for better looking)
• New Y_Holder with improved Height and door to assure the Gt2 belt
• Alternative Y_Holder from Jackass Filament (https://www.printables.com/model/205812-prusa-mk3-y-belt-holder-improved-for-gates-belts/files)
• Y-Holder has 48mm width (for compatibility with Mk3S Y-Motor Mount ultra and other mods)
• Mk3 Y Belt Holder inside collection for alternative Y-Holder (print the one you most like)
  

Original Features:
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• The mod has paralelism across all the belt.
• Is easy to print and install
• Can be used with other mods
• Original GT2 Belt can be used

Hardware Needed:
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• 2 M3x35mm socket head cap screws (for idler_Frame and Mount)
• 1 M3x30mm socket head cap screws (for tensioner)
• 2 M3x10mm for Y_Holder
• 5 M3 Nylock nut (For idler_Frame and Mount)
• Your Pulley

What files to print?
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• 1x Base Holder
• 1x Base_for_your_pulley (GT2, GT16, Prusa Version, etc)
• 1x Y Holder (this version or another)
  

Compatible Mods
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• Y-Axys Motor Mount Ultra (https://www.printables.com/model/57937-mk3s-y-axis-motor-mount-ultra)
• MK3 Y Belt Holder (https://www.printables.com/model/205812-prusa-mk3-y-belt-holder-improved-for-gates-belts/files)
  

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INSTALL MANUAL
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1º - Prepare the Base_Holder




2º - Insert the LockNuts into the Hex Holes. Dont worry if you cant, its thight. Use the Pull method from the Prusa manual and screw them :)

3º - Get the “Base_for_your_pulley” (I choose the Prusa one)




4º - Put It in the Base_Holder. Later will be screwed




5º - As you can see , the Base_of_Your_pulley has two sides. One with Hex Holes, One with Round holes.




6º - Prepare your Pulley, two M3x35 and Two LockNuts




7º - Put the LockNuts in the Hex holes! Now , from the other side, Insert the M3 across the BaseHolder + Base_of_Your_pulley + Your Pulley.
Screw a little , dont be rude. The Y base needs to move freely, and your pulley too!!!

8º - Now Prepare a m3x30 and another Locknut. Put it in the hex hole. Screw from behind.




9º - You will end with something like this!




10º - Time to pass the Belt across our Tensioner.




11º - Now pass the belt into the Bed-Holder Too, as shown in this image. Is easy in this step.




12º - Pass the rest of the gt2-belt across the motor and put it into the Bed Holder. You can now use 2x m3x10 bolts to screw the Bed-Holder to the Bed..

Optionally, you can put the Bed-Holder-Door to assure your GT2 BELT with 2 M3x18 and two hexnut or locknut.




13º - You will end with a tensioner like this one. Only one bolt to add or rest tension to the Y-Axis. You can do it from the FRONT of the printer, even if the LCD screen is in his place :)

ENJOY!