Makibox Released Design Files Missing Some Crucial Details

[NarimaanV]

To Jon or anyone at Makible who can help,

I've been looking at the CNC/Laser-Cuttable Version of the A6 released on Bitbucket, and noticed that both the parts "pom_bearing_inserts_floating" and "pom_bearing_inserts_fixed", which are responsible for the drive blocks' anti-backlash mechanisms, are missing the threads that catch on the lead screw, rendering the design files utterly useless because remaking the parts as they are would result in the lead screws having no way of moving the drive blocks and the hot end carriage at all without some threads. Is there any way of updating those files to include the threads so someone who wanted to reproduce a working drive block actually could? Thanks.

-Narimaan 

[justMaD]

To my information those are left blank intentionally, as the threading has to fit the used screw.
If you were to build it from scratch and had a different screw, you would have to build around that.

Initially those parts were CNC cut and then manually threaded, so the models don't have threads.
For a printed alternative drive-block for our production version, using our screw, you would have to subtract the existing screw model (which is an accurate representation of the real thing) from those bearing inserts.

Maybe someone who has SolidWorks can do that and upload those files in a fork?
It's an open design and anyone is welcome to make their mods.

[Bekir Yenilmez]

​I was also planning to make some hardware modifications. First one was adding self lubricating bushings to the z-axis (z-axis keeps missing steps) and ​print head (why stop once started modding :)). But besides the missing threads there are very significant differences as mentioned in the forum. Most probably the released files are for initial design which was supposed to be manufactured by 3d printing/laser cutting.

Anyway, while it is possible to model the parts from the injected parts, I prefer to work on readily available model files.

Jon, do you plan on releasing the models for final design? Or shouldn't we hold our breaths :)

Bekir

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[Jonathan Buford]

We will look at releasing the moldable parts when we have time. Unfortunately, the process of turning them into moldable parts also tends to result in some of the files not being as portable and you will find that the features all have drafts on them, so using them for new creation will be a bit of a pain. The released files at least are consistent in the big geometry, but there are quite a few parts we merged together during the injection molded parts creation, so they are not the same by any means. For things like the moving blocks, the difference is pretty minor between the two versions. For the chassis parts, less so. 

[Cassidy Silbernagel]

I've added a fork to the 5DPrint A6 3D Printer with the screw thread removed from the pom bearing inserts. Since I'm new to this whole git repository thing, I believe I've done it correctly. Please let me know if you can download those step files if you don't have Solidworks. These have no clearance for the threads and are an exact removal of the screw thread. If printed it will be too tight and will require sanding most likely.

https://bitbucket.org/cassidy_s/

Cassidy

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[rohman]

Hey, Cassidy.

I am trying to get my A6 going (have had it months but the hot-end needs redesign and it hasn't worked). I looked for the open source mech files and see the SolidWorks files at BitBucket. But there are no STEP's despite the note that they are included. Do you know where they are and how to get them?

Randy

[Jonathan Buford]

asm_5dprint_a6.STEP in the Bitbucket is the whole model.

[Cassidy Silbernagel]

My branch just has the threads removed and STEP files for the

pom_bearing_inserts_fixed_default_threads.STEP

pom_bearing_inserts_floating_default_threads.STEP

The full assembly is in the main commit,

asm_5dprint_a6.STEP

Cassidy