Driving the base frame by means of CNC

After the mechanics seemed to work I invested into the CNC parts: NEMA17 (42mm) stepper motors and a motion controller. The three pulleys did fit (the fourth motor is assigned to drive the feeder later). 

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This is the basic Sanguinololu board. When soldering it is important to read (and heed) the „Bugs“ part of the documentation.

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As usual the (vulnerable) stepper motor drivers are detacheable, so they can be swapped if damaged.

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Unfortunately neither ErikZalm (Marlin) nor jcrocholl (Rostock and Kossel printers) used a Sanguinololu – so I got a whole bunch of errors, until I eventually updated the „Sanguino“-folder of the Arduino-IDE.

Then, finally the stepper drivers tried to home the axes:

This is „bootsrapping„, so zip-tying the motors in place is justified. And also this kind of „custom moulded limit switch mount“. 😉

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The idlers consist of bent bars, washers, a screw and a ball bearing each.

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Here is the good thing about Delta printers: Repeat one axis three times:

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This fan is a measure of precaution. I burned my fingers more than once when touching the stepper drivers.

In the meantime I finally met someone with an already working Prusa i3 at the tavern. And he assisted me by printing the feeder mechanism: Airtripper’s Bowden Extruder V3. As I ordered my J-Head MK-V HotEnd before the Filament Drive Gear Review & Benchmark was written, it came along with the MK7 drive gear.

By now I would choose none of them.

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This is the assembly of the feeder:

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The J-Head mounting plate was cut with a belt saw (you could even Dremel it). The hot end cooling fan is attached to the effector via hotmelt.

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Feeding the first piece of 1.75mm PLA towards the hot end:

…and there it is, extruded to 0.35mm:

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