Open XY blocks with adjustable belt tension - for original Ultimaker (8mm gantry rods)

prusaprinters

<p>These blocks can be replaced without having to dismantle the rods and pulleys, after of course removing the original blocks. The belt tension is adjustable through a banana cam. The gantry can be easily removed without undoing the blocks.</p> <p>The 6mm gantry rod version will be posted soon.</p> <h3>Print instructions</h3><h3>Category: 3D Printer Parts Summary</h3> <p>These blocks can be replaced without having to dismantle the rods and pulleys, after of course removing the original blocks. The belt tension is adjustable through a banana cam. The gantry can be easily removed without undoing the blocks.</p> <p>The 6mm gantry rod version will be posted soon.</p> <h3> Instructions</h3> <p>Print all parts with 0.1mm layer and 100% infill.<br/> Required parts for each block:<br/> 6x M3 M6mm socket bolt<br/> 5x M3 nut<br/> 1x M3 square nut<br/> 2x tube (3mm inside, 6.3mm outside diameter, 6.5mm length) plastic or metal. I used cuts from my old Bowden tube.</p> <p>Make sure you have all parts ready before dismantling the gantry, rods and pulleys!</p> <p>Assembly:<br/> Re-assemble the rods, belts and pulleys as normal without the blocks, just the brass journal bearings in place. Don't tighten the sync pulleys, but tighten the driving ones (motors).<br/> Place blocks on the rods and assemble the key wedges, don't tighten. Slide in place the blocks over the journal bearings. slightly tighten the bolt.<br/> One block at a time:<br/> Place the square nut in its captive location.<br/> Screw the bolt few threads through the square nut.<br/> Slide the banana in place.<br/> Capture the belt under the hinge screws passing through the tube cuts acting as rollers.<br/> Position the gantry and secure rods on the blocks using the brackets. Gently tighten bolts.<br/> Tighten the belts using the adjusting bolts, enough to remove slack and hear the belt give a tone. You can balance all belts to give the same tone. Don't over-tighten!<br/> Square the gantry and tighten the pulleys. You may want to use a thread locking compound like Loctite Blue. Remember that to untighten later, you will have to heat the grubscrews or use acetone to dissolve the thread lock.</p> <p>Level the platform and start printing.</p> <p>Enjoy!</p> <p>If you like this design, feel free to donate and ask for improvements:<br/> <a href="https://www.paypal.com/cgi-bin/webscr?cmd=_s-xclick&amp;hosted_button_id=AW57FTXN35YZE">https://www.paypal.com/cgi-bin/webscr?cmd=\_s-xclick&amp;hosted\_button\_id=AW57FTXN35YZE</a></p>