Thingiverse
Z Axis Guide by Heathmang
by Thingiverse
Last crawled date: 3 years, 1 month ago
I didn't have a lot of luck with the cantilever Z axis on the D-Bot printer. Here is a design that positions the guide wheels between the side supports and has a wider spread on them. The installation only requires that the beam be square to the upright and a slight amount of pressure against the supports by all four wheels.
This setup is rock solid and the stepper motor now mounts in the middle of the support. There is also a spacer included for this setup so that the stepper and lead nut mount in the same plane. You will need 5Mx16 screws to attach the spacer and the nut holder.
Be careful not to overtighten the bolts that capture the wheels. Only a small amount of pressure is needed to keep the inner race from turning.
I haven't worked out the homing switch because I'm using a sensor.
The end supports use the cantilever arms. Two new pieces will be needed across the ends to support the bed. If the stepper cross mount from the bottom is used as one of them then only one is needed. A person might be able to just use 4 stubs for bed mounting. If you saved your scraps from the original build, this can be done using the original back support and the longest scrap.
Lastly....there is no adjuster tor the wheel pressure. I am tossing ideas around in my head and may come up with something, I'm trying not to come up with something that would cause a reprint. I HATE REPRINTS!!!! Hence, the stepper nut spacer.
Update 11/2/17 You will lose about 16 mm of y axis using this arrangement. I'm working on a fix for that but in the meantime I'm using a spacer behind my bed mount to recapture part of it.
Update 11/08/17: I took a different approach with this addition. Use one of each of the new items on a side. One piece has a cap that will rest against the bean while the other is open and can be moved to adjust the wheel pressure. My plans were to try spring loading that piece but I don't think they will move easily enough. Not giving up though. Adjusters are coming!!!
This setup is rock solid and the stepper motor now mounts in the middle of the support. There is also a spacer included for this setup so that the stepper and lead nut mount in the same plane. You will need 5Mx16 screws to attach the spacer and the nut holder.
Be careful not to overtighten the bolts that capture the wheels. Only a small amount of pressure is needed to keep the inner race from turning.
I haven't worked out the homing switch because I'm using a sensor.
The end supports use the cantilever arms. Two new pieces will be needed across the ends to support the bed. If the stepper cross mount from the bottom is used as one of them then only one is needed. A person might be able to just use 4 stubs for bed mounting. If you saved your scraps from the original build, this can be done using the original back support and the longest scrap.
Lastly....there is no adjuster tor the wheel pressure. I am tossing ideas around in my head and may come up with something, I'm trying not to come up with something that would cause a reprint. I HATE REPRINTS!!!! Hence, the stepper nut spacer.
Update 11/2/17 You will lose about 16 mm of y axis using this arrangement. I'm working on a fix for that but in the meantime I'm using a spacer behind my bed mount to recapture part of it.
Update 11/08/17: I took a different approach with this addition. Use one of each of the new items on a side. One piece has a cap that will rest against the bean while the other is open and can be moved to adjust the wheel pressure. My plans were to try spring loading that piece but I don't think they will move easily enough. Not giving up though. Adjusters are coming!!!
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