Mini Stealth v2 Is Available

[pwnyourace]

i think i found an issue on the ender 3 mount+sherpa micro that might be worth checking out on the actual CAD. toolhead seems pretty nice though. just an idea, if there was another part about 4mm thick you put below the sherpa micro it would clear the back metal plate and not require a change to the ender 3 mount part. plus you could use the K front for the micro with the extra mount hole

Edited February 19 by pwnyourace

[atrushing]

5 hours ago, pwnyourace said:

i think i found an issue on the ender 3 mount+sherpa micro that might be worth checking out on the actual CAD. toolhead seems pretty nice though. just an idea, if there was another part about 4mm thick you put below the sherpa micro it would clear the back metal plate and not require a change to the ender 3 mount part. plus you could use the K front for the micro with the extra mount hole

Raising the extruder would only work with the Crop_Top versions. Also, the Orbiter extruders sit even lower than on the Sherpa Micro. I am trying to maintain solutions that can apply to any of the extruders. I have attached a 4mm spacer if you would like to try it out.

For the K front, it would fit only if the extruder was raised by the 4mm but it wouldn't really work trying to add a corresponding threaded insert on the core piece. It would interfere with the mounting holes for several of the supported hotends.

Sherpa Micro Spacer 4mm.stl

[Niek Linnenbank]

Hello atrushing,

 

Thanks a lot for sharing this design. I really like the modularity, especially that the shroud can be removed while the core piece remains mounted on the X carriage. The two 4010 fans provide good performance in my tests so far. I've been able to build the mini stealth v2 using a bambu hotend clone, sherpa micro and BIQU microprobe on my custom corexy printer with good results.

While building I did encounter one minor challenge which I wanted to share with you. In particular, the 4010 fans I ordered from Aliexpress did not completely fit in the shroud:

https://nl.aliexpress.com/item/1005006363628031.html

As the specifications diagram shows on that page, the depth of the fan housing should be about 10mm +/- 0.2mm. When measured with a caliper this turns out to be 10.60mm, which is slightly more. Additionally, the width and height of the housing measured 40.20mm. These actual dimensions result in the fan not fitting in the shroud without breaking it apart. I also measured a similar fan from an old Ender 3, and measured 39.90mm x 39.90mm x 10mm. So there is some variance in the actual dimensions for these fans.

As a workaround to still use the fans I bought, I imported the STL in blender and adjusted the model (see attachment).

What is your opinion on this? Do you think the fans from the link above should just not be used, or could there be a solution for the toolhead that helps improve tolerance for the fan housing dimensions?

Regards,

Niek

 

shroud_with_extra_4010_tolerance.blend

[atrushing]

6 minutes ago, Niek Linnenbank said:

Hello atrushing,

Thanks a lot for sharing this design. I really like the modularity, especially that the shroud can be removed while the core piece remains mounted on the X carriage. The two 4010 fans provide good performance in my tests so far. I've been able to build the mini stealth v2 using a bambu hotend clone, sherpa micro and BIQU microprobe on my custom corexy printer with good results.

While building I did encounter one minor challenge which I wanted to share with you. In particular, the 4010 fans I ordered from Aliexpress did not completely fit in the shroud:

https://nl.aliexpress.com/item/1005006363628031.html

As the specifications diagram shows on that page, the depth of the fan housing should be about 10mm +/- 0.2mm. When measured with a caliper this turns out to be 10.60mm, which is slightly more. Additionally, the width and height of the housing measured 40.20mm. These actual dimensions result in the fan not fitting in the shroud without breaking it apart. I also measured a similar fan from an old Ender 3, and measured 39.90mm x 39.90mm x 10mm. So there is some variance in the actual dimensions for these fans.

As a workaround to still use the fans I bought, I imported the STL in blender and adjusted the model (see attachment).

What is your opinion on this? Do you think the fans from the link above should just not be used, or could there be a solution for the toolhead that helps improve tolerance for the fan housing dimensions?

Regards,

Niek

shroud_with_extra_4010_tolerance.blend 1.48 MB · 2 downloads

That is a killer price on the 4010 blowers! It's a shame they don't fit so well. I am having troubles downloading your .blend file right now so I will try again tomorrow but I'm glad to see other people making use of Blender!

I just measured some of my spare/testing shrouds and all of them are around 39.8mm x 9.9mm. A couple times I have filed the corners off a 4010 blower to make up for the fact that the print rounds off the inner corners but I haven't ran into a blower that wouldn't fit yet :knock on wood:.

I think the more universal solution would be that some blowers won't fit or would need filing instead of having a design where most blowers end up fitting loosely in the shroud. When I make another modification to the shrouds, I will try to see if I can add ±0.3mm to the 40mm shroud dimension. I will look into the possibility of making the bottom section wider but angled in so that it should be able to pinch a wider range of blowers.

[Niek Linnenbank]

That's an interesting suggestion - it did not occur to me that filing the fan blower itself would solve the problem as well! I think its because in most of my printed projects, I always try to adjust for dimensions in the printed part, instead of modifying an off-the-shelf part. But in this case, I agree it doesn't make sense to adjust the design if most of the 4010 blower fans available on the market are already fitting well. I've tried your suggestion of filing / sanding the 4010 blower fan from the aliexpress link, and that worked perfectly - they now fit the original printed model.

Thanks again for sharing your work on this toolhead. I'll probably make a few more of this toolhead for my next printers as well.

Regards,

Niek

[Lusanagi]

Hey @atrushing
I'm thinking about buying a formbot kit, which includes a manta mp8 and an sbb2099, and I of course am thinking of installing a mini stealth on it, but I'm feeling a bit cheap about buying an ebb36 for it
Would it make sense to have a mod to mount the sbb2209 (don't think I've seen one) or should I just dish out the extra $15?

[atrushing]

50 minutes ago, Lusanagi said:

Hey @atrushing
I'm thinking about buying a formbot kit, which includes a manta mp8 and an sbb2099, and I of course am thinking of installing a mini stealth on it, but I'm feeling a bit cheap about buying an ebb36 for it
Would it make sense to have a mod to mount the sbb2209 (don't think I've seen one) or should I just dish out the extra $15?

I will check the 3D model and see how it could fit. It looks like they have a USB version as well as the CAN version. Do you know if they are the same size and which one do you have?

[Lusanagi]

3 hours ago, atrushing said:

I will check the 3D model and see how it could fit. It looks like they have a USB version as well as the CAN version. Do you know if they are the same size and which one do you have?

I took a quick look at the BTT store and see they look kinda different, although it seems the mounting holes are in the same place; as for the one included in the formbot kit I see in the pictures it's the CAN one (and the BOM states so)

For reference, this is the usb one

[atrushing]

22 hours ago, Lusanagi said:

Hey @atrushing
I'm thinking about buying a formbot kit, which includes a manta mp8 and an sbb2099, and I of course am thinking of installing a mini stealth on it, but I'm feeling a bit cheap about buying an ebb36 for it
Would it make sense to have a mod to mount the sbb2209 (don't think I've seen one) or should I just dish out the extra $15?

The two PCBs together really are quite large compared to the Mini Stealth.

Sorry, but I can't imagine any way to mount these rigidly to the toolhead.

[Lusanagi]

2 hours ago, atrushing said:

The two PCBs together really are quite large compared to the Mini Stealth.

Sorry, but I can't imagine any way to mount these rigidly to the toolhead.

It's ok, just wanted to ask even though I was 90% sure it may not be possible; thank you for looking into it either way

I did see how to save on something else I was gunning for in AliExpress and ended up buying an EBB36