X/Y Optical End Stops (3D Printer Part 10)

boucaron (57)in #technology • 7 years ago

This time I am integrating the XY End Stops on the machine.

There are different ways to implement end-stops:

Mechanical Switches: which is commonly found in many printers (contact).
Induction Probe: mostly used as Z End Stop, when your printer has an automatic bed leveling (contact less).
Optical Switches: contact less.
Magnetic Switches (Hall effect): contact less.

I choose to go for optical end stops for both the X and the Y axis.

A few parts have been created:

2 Supports for the X axis.
2 Modified X bearing carrier.
2 Supports for the Y axis.
2 Modified Y bearing carrier.

X Axis

This is a symmetric design, I put two end stops.

The support is secured on the chassis with 2 M5 screws with large holes of 7 mm (drilled after) in order to allow to compensate the position of the optical switch, it has 2 small M3 screws to hold the optical switch.

Screenshot from 2017-10-19 09-40-49.png

The modification of the bearing carrier is very simple as you can see, it is 3D printed in an opaque colour. Just need to be extra careful with measurements.

Screenshot from 2017-10-19 09-40-53.png

Y Axis

The design is similar with few length modification on the End Switch support.

Screenshot from 2017-10-19 10-21-13.png

For the Bearing support the additional piece is on the right side due to lack of room on the other side.

Screenshot from 2017-10-19 10-36-19.png

3D Printing

The bearing supports needs a bit of bed supports with a large enough conical base to ensure proper adhesion on the headbed.

Screenshot from 2017-10-19 10-42-08.png

Supports configuration:

Screenshot from 2017-10-19 10-42-27.png

Assembly

To ease the assembly, I over-bored the chassis supports to 7 mm instead of 5 mm to ensure a contact less assembly and to ease the alignment of the parts. Those optical supports are delicate parts. You can see there is nearly no room left over.

Forthcoming part

I am working on the Bed and associated end-stops.

Previous Parts

#printing3d

7 years ago in #technology by boucaron (57)

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mitchhunter (60) 7 years ago

I built one few years ago based on printrbot with few modifications. I replaced it with ctc and I use 3d printing often since then. Check my profile of you are interested. I build toys and props.

$0.44

12 votes

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boucaron (57) 7 years ago

I have a ctc too with few modifications (bowden + bigger stepper motors)

$0.00

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minnowbooster (73) 7 years ago

Calling @originalworks :)
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Nice, you got a 7.0% @minnowbooster upgoat, thanks to @boucaron
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1 vote

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originalworks (69) 7 years ago

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