how to apply MK4 upgrade on Bear 2.1

[bgiot]

Hi, it's more a question: I have a bear 2.1 mk3s with bondtech extruder. Will the MK4 upgrade work outofthebox ? Or do I have to comeback to the original frame design and wait for bear 3.0 design ?

[stahlfabrik]

It cannot be compatible - 10mm z rods for example are not compatible, the electronics and display parts are not compatible. Parts of it should be compatible: the motors for example:-)

[PRGeno]

I'd think the Z rods could be easily accomdated with some minor Z rod mount alteration. The electronics and screen should also be easy to accomdated with a new electronics box and display mount alterations.

I'm sure I'm missing something but I just don't see much standing in the way of supporting the Mk4 upgrade.

[Pyroschnueffler]

I hope that too, that Gregsaun make a Update to go on the MK4
I love the Bear Mod, and i hope so that the MK4 Update comes.

[akbiocca]

The MK4 4.0 upgrade may create a lot of interest in the Bear frame as the parts removed from the MK3 in this 4.0 upgrade process will almost complete a bear frame less what, a power supply?

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On Tue, Apr 11, 2023 at 1:38 AM Pyroschnueffler ***@***.***> wrote: I hope that too, that Gregsaun make a Update to go on the MK4 I love the Bear Mod, and i hope so that the MK4 Update comes. — Reply to this email directly, view it on GitHub <#138 (comment)>, or unsubscribe <https://github.com/notifications/unsubscribe-auth/A3AIDK3RV73E3LPOQ4A2W53XAUKALANCNFSM6AAAAAAWM2Y2GI> . You are receiving this because you are subscribed to this thread.Message ID: ***@***.***>

[PRGeno]

From what I can tell (we'll have to wait to see the final BOM for the Mk4 upgrade kit) the upgrade is essentially an electronics upgrade (main system board & control panel screen), a new extruder (Nextruder), and a new set of motors (the Mk3.9 is the same upgrade but without the 0.9 stepper motors).

The only structural things that matter with the Bear frame is how the X & Z axis mounts might differ (and they can't change by that much - the X axis looks to stay the same), and how to mount the electronics.

It appears to only need some minor alterations to a few printed parts (many of us already use custom printed parts instead of the stock Bear parts). We'll have to wait to see what Prusa actually delivers in the upgrade kit when it becomes available, but it should be relatively easy (far easier than what Greg did to create the Bear upgrade in the first place).

I'm sure it's just a matter of time before someone figures out how to interface the new Mk4 parts onto a Bear.

[DesC21]

I started to work on updating the necessary parts (I do hope Greg will recover soon and can do a proper update @gregsaun get well soon). I don't have a MK4 yet but the original parts (STL only) are online.
I think all that is needed is changing the following parts:

z_motor_mount
z_top
lcd_support_a
lcd_support_b
mounting parts for the new xbuddy case (since it is not 3D printed anymore we don't have the CAD data, I guess it is directly screwed to the frame but I haven't looked into it yet)

From what Prusa said the y-axis should work without problems. But since the carriage and design changed a little bit, maybe the height did too? But since the upgrade kits work with the old MK3 frame it should not be necessary to change anything.

So far I finished the z-axis parts. Greg's design is so well made, the z-axis changes were quite easy. The LCD and xbuddy case parts need a bigger update though. I'll try to finish the LCD supports today.

Does anyone know how I can publish these? I guess I have to release the source files as well or can I simply release the stl and mark them as remixed? Never looked into these details tbh...

[Pyroschnueffler]

I works on in it too, but i am not a CAD Profi. I switch all MK4 Parts from Prusa to Solid objekts in the Moment.
I hope Your Work is better than my.

[DesC21]

I works on in it too, but i am not a CAD Profi. I switch all MK4 Parts from Prusa to Solid objekts in the Moment. I hope Your Work is better than my.

That's great let us know how it goes! I am no expert either, just trying to make it work ;)

Have you checked the new LCD cover and supports, yet? I noticed that on the original Prusa parts there is a collision when you align the mounting hole from the support part and the xlcd case (right side). Not sure if I am doing something wrong but aligning the holes should work?

Anyway I updated the LCD_support_a and b. Looks okay so far. The right mount is around 2,5mm over the edge of the case, not happy with that ;-). The angle of the display is the same as on the stock MK4.

and a little comparison between the new and old LCD case. The new one is actually more compact.

[PatB42]

so far very nice job, if any need i can help , i have modified several parts from the 2.1 bear for me , i redo a complete new rambo box as i wanted to use the Duet2wifi , apparently you work on fusion this is perfect for me ..the problem is i can't find even the STL for the new xbuddyboard ? there isn't in the printable mk4 ? any idea to find cad from this board or exact dimension size.....

[Pyroschnueffler]

Hello when i am finished i can check the collision with the parts

[Pyroschnueffler]

Yes u are right its a collusion, you not have made it wrong.

[Pyroschnueffler]

Any new Updates here? i am thinking to bye the mk4 complete Kit and i will see what changes i must made.

[ciscokeb]

I purchased the MK4 KIT, but I’m going to dial it in before I do untested modifications (updates). 😊 Keith From: Pyroschnueffler Sent: April 30, 2023 10:50 AM To: gregsaun/prusa_i3_bear_upgrade Cc: Subscribed Subject: Re: [gregsaun/prusa_i3_bear_upgrade] how to apply MK4 upgrade on Bear 2.1 (Issue #138) Any new Updates here? i am thinking to bye the mk4 complete Kit and i will see what changes i must made. — Reply to this email directly, view it on GitHub, or unsubscribe. You are receiving this because you are subscribed to this thread.Message ID: ***@***.***>

[DesC21]

Any new Updates here? i am thinking to bye the mk4 complete Kit and i will see what changes i must made.

I ordered a MK4 kit but I guess it won't be here until june (earliest). So I can't test anything.
I haven't done the missing parts for the new xbuddy case. Does anyone have the measurements for the holes in the frame (they are the same on the MK3)? Otherwise I have to dig out my old frame.

Another thing, can anyone say anything on how warm the new board/case gets? Prusa uses the case as a heat sink and I guess that's why it is also directly connected to the frame. This won't be possible for the bear, as far as I can see. So it would be good to know if the case gets warm and even needs the frame to dissipate heat (I think this won't be necessary but you never know).

[HK-Moebius]

I guess the case as heatsink is more than enough. The new board uses the same Trinamic 2130 as the MK3 which had no heatsinks for the drivers.