Ultimate Hemera Anet A8 / AM8 Carriage For LM8LUU With Chain

Description

A nice and sturdy Hemera X carriage for your AnetA8 and AM8 printers! Comes with a belt holder, bearing blocks (specifically for LM8LUU bearings) and an optional cable chain! NOTE: I haven't tested the offsets on the original Anet A8. I have no idea if you will maybe lose some build volume in X, Y or Z directions. If someone still has the original Anet A8, please let me know how it works out. *UPDATE 2020-02-29:* * Updated and beefed up the model for *Carriage_Chain.stl*. The part was too thin and would start to droop down from the heater cartridge's heat. * Updated the model for *Chain_Long.stl*. The chain was too floppy and would fall down instead of being straight. The new model no longer allows for bending. The older model is still available under the name *Chain_Long_Bendable.stl* if you want to use it for some reason. * Updated the model for *Motor_Chain.stl*. Slight changes to allow for better compatibility with the new longer chain sections. Added holes for a zip tie. *UPDATE 2020-05-05:* * Completely changed the model *Motor_Chain.stl*. The part has a bit better designed geometry now and fits with my new [Ultimate AM8 X Holders With Tensioner](https://www.thingiverse.com/thing:4338879). The old model can be found under the name *Motor_Chain_Old.stl*. * Updated some of the required components info. **Features** * Drop in replacement for the Anet A8 / AM8 X carriage. No need to change the geometry of X smooth rods, motor placement, etc. You may need to change the offset of the hotbed however. Please check the NOTE above. * Uses LM8LUU bearings for extra stability. * Features an optional cable chain. **Required Components** * 1x **E3D Hemera** - Duh. [Link (e3d-online.com)](https://e3d-online.com/e3d-hemera-175-kit) * 2x **LM8LUU Bearings** - Any Chinese unbranded ones probably work but expect bad tolerances and play. I personally use Misumi branded ones to eliminate all play. [Link (uk.misumi-ec.com)](https://uk.misumi-ec.com/vona2/detail/110302578040/?HissuCode=LMUWR8&PNSearch=LMUWR8&KWSearch=LMUWR8&searchFlow=results2type) * 4x **M3x10 screw, countersunk** - Required for mounting the Hemera motor. Anything longer risks damaging the motor as it is a very tight fit with the inserted square nuts. * 4x **M3 nuts, square shaped** - Same as above, required for mounting. * 8x **M4x10 screw, button head or hex head** - Needed for the bearing blocks. You can use the ones that came with your Anet A8 (M4x8) as well. * 3x **M3x20 screw, hex head** - Required for the belt holder. You can use the ones that came with your Anet A8. * 4x **Zip Ties** - For securing the bearings. * *Optional* 3x **M3x10 screw, countersunk** - If you decide to print the cable chain as well, needed for mounting the chain. * *Optional* 3x **Zip Ties** - For securing cables at the ends of chain. **Parts To Print:** * 1x **Carriage_Base.stl** - This is the main part of the carriage. Hemera, bearings, belt holder and optionally chain are mounted onto it. * 1x **Carriage_Bearing_Top.stl** AND 1x **Carriage_Bearing_Bottom.stl** - These are not the same and you have to print both. The upper bearing has an indent for a screw used to mount the Hemera, along with a protrusion to help trigger the endstop. * 1x **Carriage_Belt.stl** - Needed to attach the belt. * *Optional* 1x **Endstop.stl** - A nice replacement endstop for the AnetA8. The following parts are optional and only needed if you plan using the cable chain. * *Optional* 1x **Carriage_Chain.stl** - Used to mount the chain to the carriage. * *Optional* 1x **Motor_Chain.stl** - Used to mount the chain to the X motor. * *Optional* 2x **Chain_Long.stl** - Longer segments of the chain. * *Optional* 18x **Chain_Short.stl** - Shorter segments of the chain. * *Optional* 4x **Chain_Clamp_Long.stl** - Clamps for the longer segments of the chain. * *Optional* 20x **Chain_Clamp_Short.stl** - Clamps for the shorter segments of the chain. **Printing Instructions** * Most parts don't need any supports. The only parts that needs the supports are the Motor_Chain.stl and Carriage_Chain.stl. * Print all parts exactly as already oriented to maximize quality, strength and ease of printing. * You may use 20% infill for all parts. * You may print all parts at 0.2mm layer height. **Assembly Instructions** 1. Print all of the necessary parts, along with chain parts if you decide to use it. 2. Press fit the LM8LUU bearings into the two bearing blocks and tie them using two zip ties each. The ties are not mandatory as the bearings are press fitted, but they can still help. 3. Slide the bearing blocks onto the smooth rods and install the smooth rods as you normally would. 4. Place the carriage base onto the blocks and screw them in using 8x M4x8 screws. Tighten them slowly bit by bit and ensure that the carriage still moves smoothly once you are done. 5. Now that bearings have been aligned, remove the lower smooth rod in order to install the Hemera. I am aware that the rod is geometrically blocking access to the Hemera screws, but there should be no reason to remove it afterwards. 6. Mount the Hemera onto the carriage base using 4x M3x10 countersunk screws and square nuts. 7. Restore the lower smooth rod. Ensure once again that the carriage slides smoothly. 8. Screw the belt holder into the back using 3x M3x20 hex head screws. Attach the belt. 9. *Optional:* If you planned installing the chain, follow the next instructions. 1. Assemble the chain as so: Motor_Chain.stl -> 2x Chain_Long.stl -> 18x Chain_Short.stl -> Carriage_Chain.stl 2. Mount the chain onto the printer. The motor side should be mounted using 3 of the motor's screws on the front of the block. The carriage side should be mounted using 3x M3x10 countersunk screws directly into the carriage base. 3. Insert the cables into the chain. I suggest zip tying them at the ends at the provided anchor points. 4. Clip the chain clamps to prevent cables from falling out. The clamps should snap right into place, into their designated slots on the chain segments. If you have any questions or found some issues, be sure to comment! I will see what I can do! As usual, I have also included the Blender file in case you want to edit it further.

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