My Tantillus/Ingentis variant

Hello,

I wanted to see what you thought about my variant. It started as the idea of an aluminum extrusion Ultimaker, then I found out about Ingentis and the Tantillus. It'll be driven with 65lb fishing line or another static line. Would just wrapping the line around a metal shaft collar instead of drilling a hole or printing a pulley work? The clear bed is just so you can see through it, and will be metal. The total build volume should be around one cubic foot.

I placed the z steppers such that the frame itself will be a heat sink for them.

Good to see another variation.

If you check out JimJimma's G+ page you can follow the progress a little more than what he posts here. [plus.google.com]

At one point he used printed spools and recently he has removed them in favour of wrapping the cables directly around the rod without holes through the rod.

Also the cable Z axis does not have a hole for the cable and it has never slipped.

Edit: Ingentis is currently running 120lb line.

Edited 1 time(s). Last edit at 02/23/2014 04:33PM by Sublime.

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Thank you for the link. Looks like it's working really well.

Edited 1 time(s). Last edit at 02/23/2014 04:58PM by naxem42.

Also I highly recommend staying away from a lead screw Z axis.

Have a read through [forums.reprap.org]

As well as look at the results of Ingentis, Up printers, Delta bots, Tantillus cable Z axis which all have belt or cable Z axis and produce consistent reliable wobble free prints.

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Cool.

I saw he's using a 36 and 74 tooth pulleys for it. What if you used a 20 and 100 tooth or something? Would it help at all?

Ingentis is geared down because he is using something like a 36 tooth pulley for the main belt as well so it needed to have the reduction to get a decent resolution. His gearing now allows for a really nice layer interval with something like 0.01mm per step. For Tantillus's cable Z axis it is a spool directly attached to the motor and has a limited layer interval based on the printed spools final circumference. My cable Z axis has 0.009934433 mm per step which only allows for a few good good layer heights without major rounding errors.

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Ok, I see.

Ok, I've probably given this a lot more thought than I should have, but here it goes anyway.

Given a 20 tooth pulley, the belt will move 20mm per revolution (I think) because each tooth is 1mm. Geared down by a factor of 5(100 tooth pulley), the belt on the z axis will move 20(20/100)mm = 4mm per revolution of the stepper motor. It has 200 steps per rev., so 4/200mm = 0.02mm per step, a nice even number.

With the 36 and 74 tooth pulleys, it's 36(36/74)mm = 17.51351... mm. Divided by 200 it's 0.087567...mm per step.

But there are already great results with the current setup. I'm just wondering if it will make a difference.

Please correct me if I'm wrong.

Quote
naxem42
Given a 20 tooth pulley, the belt will move 20mm per revolution (I think) because each tooth is 1mm.

Most RepRap suppliers sell 2mm pitch GT2 blets and pulleys and I have some that are 3mm so it would move 40-60mm per revolution with those. Also note that the larger the pulley you use the less backlash you will get because it gets averaged over the teeth.

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