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Simon's adjustable Y motor bracket

by Wired1, published

Simon's adjustable Y motor bracket by Wired1 Aug 24, 2012

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Summary

Redesigned Y motor bracket for the Mendel Prusa 3D printer. Features top tensioner bolt to make belt tensioning easier, and it works.
Modelled in heeksCad. It is intended to work with Y-carriage I designed and which doesn't have a built-in tensioner.
The photo below with it on the end of my Mendel Prusa is to show how it fits with the rails and is not where it goes on the machine :)
Inspired by two earlier designs both of which are good ideas but needed further development - this places the adjuster on the top rail where it is easy to access and the whole thing fits better.

Instructions

Just print it - I didn't need to drill out any of the holes on the one I printed.
3 perimeters, 3 layers, 0.35 nozzle, 0.25mm layer height, 25% infill at 90 degrees fill angle.
I have removed the earlier version that was a bit too tight and replaced it with Y-adj_S2d which has a corrected top rail arc.
The adjuster screw is a M4 and needs to be 40mm or more long.

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A little tip for anyone making this.. If you run into trouble with the M4 nut spinning while you try threading the M4 bolt through it, a vise is your friend.

First, to get the M4 nut in the hole at all, I pushed the nut into the slot, put the whole thing in a vise between two pieces of wood, and slowly closed the vise, pushing the nut in. To get it in the rest of the way, I temporarily put a bit of blue-tac (basically sticky adhesive that feels like silly putty or dried up gum) on the outside of the nut and stuck another nut next to it, carefully put that between the wood, and closed the vise again with it angled so I could look down the hole (I closed it just enough that I could see the hole of the nut centered over the hole). I opened the vise and took off the 2nd nut and blue-tac.

But then when threading the M4 bolt through the plastic, it made it to the nut and the nut started to spin. Since I couldn't grip the nut with pliers (since it was recessed inside the plastic), I tried using the vise again. I took two nuts and blue-tac'ed them to the outsides of the real nut, put them between wood again, and closed it all ever so slightly in the vise. That held the nut in place so I could turn the M4 bolt with a screwdriver until it went through the nut all the way. Once that was done, I could take everything out of the vise, take off the two outside nuts and the blue-tac, and I could turn the M4 bolt without the nut spinning.

Most of you probably won't need those steps, but if you get stuck, that's what worked for me.

So simple and should be able to fix my Y-axis belt tension woes. Gonna print ASAP. I will need to do a mirror image, however since I have my motor pointed the other way for simpler wiring sake.

I wish I'd thought of that - I fitted my electronics to the right hand side too :)

Fitted the belt to this today and it seems very stable and easy to adjust. Needs a longer 4mm machine screw on mine to get the full travel - something like 40mm long would be ideal

with this little modification you won't have to bother with the bending effect off the bent tension as i experiment (I had to fix the bottom of the motor to the rod with a tie rap - simple effective but not very aesthetic !) I can post the stl if you want

So being a slot it is fighting the belt pull - guess this is why the mendel pro one has two sides. Yes please post the stl.

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