Needed a pulley. Made one. 160 tooth HTD-3M pulleys are impossible to buy anyways.
This also marks the first time i’ve used my printer in the full enclosure that i made for it when i built it. It gets up to a toasty 45°C (all the electronics are in a different thermal zone in the rear pillars), which helped a lot with keeping the print from warping. It also lowers power consumption of the heated beds by a fair bit. Motors were around 75°C.
Details on the print: ABS, 0.2mm layer height, 10% infill, 2mm shell all around. 120/105C heated beds with glass and glue stick.
And please excuse the dangly mess that my x-carriage is. I’ve remove the cable carriage everything usually sits in for now.
Looks nice, what’s it going to run and do you think It’ll hold up?
@Liam_Jackson it’s going to replace the chain drive on my filament extruder. With this size pulley, the belt will give in at about 10Nm (which is plenty), and I know the aluminum hub will hold up as well. Solidworks says the printed part ends up with a safety factor of about 10, even without infill, so I’m fairly optimistic there.
@Thomas_Sanladerer Just curious if you did a dynamic study that also had loading for the belt tension. I love SolidWorks.
@Ben_Malcheski naw, just a simple static one on a simplified model. It’d be a beast to set it up in a way that it would be completely accurate load-wise, but even then it would not account for hex infill and interlayer adhesion. So all i really needed was a confirmation that my gut feeling was somewhere in the right ballpark.
can you post a closeup of the gear teeth? are they true involute?
@Rick_Fetters HTD belt, like most belt types, doesn’t have a super complicated tooth profile, so the pulley is a fairly simple shape as well. Also, the exact belt i’m using is a RPP type, which is compatible to the HTD/GT family of belts, but uses a different and more tolerant tooth profile.
I’ve added a picture of the teeth and belt meshing to the album above.