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Another battle in the string wars: cabled z-axis working

It took me 10 hours and fifty minutes to print the first print table bracket and I got a few measurements wrong, but it appears that the cabled z-axis concept is going to work.Since the speed of the...

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A Z-axis gear set for the Sampo 3D printer

Few experiences are more satisfying than a creating a useful device of great intrinsic beauty

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NEMA 23 connected to the Z-axis lead screw

With the completion of the gear pair last night, the connection between the NEMA 23 and the Z-axis lead screw is complete. That milestone meant that I had to move Sampo into the front room so that...

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Winding up the String Wars

I was finally able to finish making the connection between the z-axis lead screw and the cable turnbuckle for the z-axis positioning system. Given that the 3/8-24 threaded rod moves 0.945 mm per full...

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Stepping into firmware

Having had good experience with the Rapman's PIC32-based controller, I decided to stick with that MCU for my new printer.  As I mentioned earlier, rather than buy a $1k+ C compiler from Microchip, I...

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Ready to install the print table

I got the last of the y-axis brackets printed and light mounted.It looks like the print table with be 420x420 mm.  I've designed a bolt-on template that seats the table on the brackets and shows me...

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Print table installed

I had gone to considerable trouble to make sure that I sited the bolt holes in the MDF {medium density fibreboard} print table properly. To that end I designed a template for each of the brackets that...

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A "string wars" approach to the y-axis

Darwin and it's direct derivatives uses two belt loops driven by a shaft connected to a NEMA 23 stepper. In Sampo, that dual loop arrangement has been replaced with a single large loopThe belt guides...

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Flex cable carrier

I've never been happy with the way that Rapman handles axis and extruder cabling, so I decided to print my own flex cable carrier system.  I saw several possibilities in Thingiverse.  Most of them were...

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Printing flexible cable guides...

There is not much to say about this.  Once I got two of the links printed and assembled so that I knew everything fit together, I bought a few hundred #4-40 3/4 inch machine screws and nuts to hold the...

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Y-axis test firmware operational

After a delightful chat with Bogdan this morning about the PIC32's MIPS core processor, I was able to get the y-axis test firmware working.  Bogdan has done a lot of work with the PIC32 and is very...

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Picking up speed

The MIPS core that PIC32 uses is a very high performance CPU that was used in high end Windows workstations in the early to mid-1990s. It doesn't behave much like the 8 and 16 bit PIC chips, so it's...

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Printing a Mendel derivative

After talking with my son recently, I concluded that he needs to start printing a lot faster than I'm going to have Sampo debugged and duplicated. I have a lot of 8 mm linear shafting and linear...

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Mendel frame takes shape...

I had a major crash of the Rapman 3.0 printer and for several hours I thought I was really knackered. One of the leads to a phase of the extruder stepper parted because of fatigue from thousands of...

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Mendel z-axis stepper mounts done

I managed to get some hours together to do some more work on my son's Prusa Mendel, the z-axis stepper mounts this time.I printed the z-axis stepper mounts at a 45 degree angle to minimize parts...

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Leveraging Bogdan's anti-bounce circuit for Sampo...

In developing the Darwin-derivative, Rapman-derivative Sampo 3D printer project as a kaizen exercise I utilized the same sort of microswitches for limits checking as are specified in the Rapman design....

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X & Y Axes operational from the controller

I was finally able to get time to integrate the full anti-bounce board with the x and y axis limit switches. The two axes are playing ping pong and running at a speed of 65 mm/sec with no slippage and...

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Bogdan makes a measurement suggestion...

After I got the x and y axes operating independently, Bogdan suggested that I measure the steps between the limits switches to see how much difference in measurements might be attributable to the...

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Sampo's touch screen begins to work...

Adriaan has been working hard learning the TFT programming protocols and has his first touch screen menu working on the Sampo controller board.

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A new acquisition...

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