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Mark Heywood
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A good introduction to Fusion 360

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Airtripper filament force sensor update!
Testing the 2.2" TFT Adafruit screen today for the force sensor graph. Now getting ready to publish the code and the screen hookup details, also working on the screen bracket for attaching to the printer.

The graph size and range can be customised, on my hot end I only need  a 1kg range, but you can go as high as you need. The graph shows a retraction reaching around -250 grammes.

More information about the filament force sensor can be found in a number of articles here: http://www.airtripper.com
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A Home offset guide that may be useful to those who don't have auto levelling on their 3d printer yet.

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Latest blog post.
Are you using the best filament drive gear for your set-up? Take a look at the benchmark graphs with details about each drive gear.
Benchmarking done with the Airtripper Extruder Filament Force Sensor.

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I've done some filament drive gear benchmarking using the Airtripper extruder filament force sensor and graphing software I'm currently coding.

So as an exercise, while I finish up on the drive gear benchmark and review blog post, how would you rank the gears (shown in the picture) according to stable pushing power performance; which gear performs the best to which gear performs the worst?

Note that the performance is based on using direct drive NEMA 17 stepper motor so maximum torque is a restricting factor.

I already know the result but it will be interesting to know if the result is reliably predictable by others without the benchmarking tests.
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Here's a project I've working on, using a load cell and the INA125 Instrumental Amplifier. If you're interested in using load cells in the future you might be interested in this guide which includes setting up the provided arduino sketch for calibration.

http://airtripper.com/1626/arduino-load-cell-circuit-sketch-for-calibration-test/
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2013-10-10
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An update on Marlins auto bed levelling feature project.
Got the 3d printer set-up and fitted with an auto bed levelling probe. Took a bit of time to complete and everything worked apart from one issue, the bed was probed in the same spot at home position 3 times.
My guess is that auto levelling only works from X+ and Y+ endstops like  it shows in the you tube clip I'd seen.
The endstops are too difficult to get to without taking the printer apart so I've decided to shelve the auto bed levelling feature for the moment.

There seems to be some issues with the servo not landing the same rotation position and had to cut power a few times to stop bed and nozzle crashing. The angle of rotation is not user selectable and I had to invert rotation direction by editing code.

I think on my next attempt I'll dump the servo probe and use the hotend as the probe instead.
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2013-10-10
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Got the 3d printer set-up and fitted with an auto bed levelling probe. Took a bit of time to complete and everything worked apart from one issue, the bed was probed in the same spot at home position 3 times.
My guess is that auto levelling only works from X+ and Y+ endstops like  it shows in the you tube clip I'd seen.
The endstops are too difficult to get to without taking the printer apart so I've decided to shelve the auto bed levelling feature for the moment.

There seems to be some issues with the servo not landing the same rotation position and had to cut power a few times to stop bed and nozzle crashing. The angle of rotation is not user selectable and I had to invert rotation direction by editing code.

I think on my next attempt I'll dump the servo probe and use the hotend as the probe instead.
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2013-10-10
2 Photos - View album

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Another 3d printer bed levelling to note
I made a bed leveling probe out of the hotend itself. Per an idea by Daniel on the deltabot forums. The resulting design is much less bulky than the original. The key features are: no deploy/retract required, no pin/spring/collar required, no bulky tower to hold pin assembly. The requirement for use is to perform a pre-heat and wipe of the tip to clean it before probing. This can be done via start-gcode commands prior to issuing the G29 command to auto-level.

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