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CthulhuLabs

CobbleBot Horizontal X Axis Mod V3

by CthulhuLabs Nov 18, 2015
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Hello, thanks for sharing your design. I am also planning to apply it to my Cobblebot Basic. I have printed the stepper mount and will continue with the rest tonight. I am new to 3D printing; just wanted to clarify the use of the 30 mm length 5 mm diameter rod ('For the Idler adjustments you need 2 15mm M5 bolts and 2 M5 nuts plus a 30mm length of 5mm diameter rod.')

What length of 5 mm rod was used to reach the second pulley, ~ 400 mm?

Sorry for the delayed response. The part you are quoting is for the idlers not the drive pulleys. The 5mm drive shaft I got was 500mm and I cut it to size once installed on the printer. I ordered it from McMaster Carr. If you can find stainless steel in 5mm diameter I recommend it. Mine is drill rod and it gets a small layer of rust on it that I have to clean off every so often. I would think 400mm should be enough though.

The small shafts used for the idlers were cut from the remainder of the main drive shaft

Also I recommend printing all of the parts out of ABS. I used PLA at first and but over time they cracked.

Comments deleted.

I'm ordering parts to try your mod. Which length m5 bolts will I need for your drive shaft/idler mounts? Also curious why you went with a 16 tooth pulley instead of 20. Thanks for the design!

I used 10mm M5s for mounting with drop in T-nuts from OpenBuilds. I think you can get away with 8mm M5 with standard T-Nuts.

As for the pulley, it had two pulleys and a belt and came with Amazon Prime free shipping. That is literally the only reason. You do get a little bit more X precision from it, but its not really noticeable. 20 tooth will work fine. You might need to adjust the shalf mounts to accommodate a bigger pulley, but that is why I included the SketchUp designs.

Word of advise. Make sure your drive shaft slips easily in and out of your coupler before tightening it in place. Mine was snug at first, then the temperature changed and the two different metals expanded at different rate, locking together. It was a nightmare getting them apart.