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Prusa Bear Mini Mk3s  

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jmac
 jmac
(@jmac)
RE: Prusa Bear Mini Mk3s

Posted : 07/12/2021 2:06 pm
Tomson
(@tomson)
Trusted Member
RE: Prusa Bear Mini Mk3s

Hi jmac. I use OEM Prusa smooth shaft pin for the idle pulleys

Posted : 07/12/2021 3:22 pm
jmac liked
jmac
 jmac
(@jmac)
RE: Prusa Bear Mini Mk3s

Thanks Tomson 👍 

yes I have everything i need now, just have to wait on aliexpress shipping 🤮 

Posted : 07/12/2021 3:25 pm
greylock23
(@greylock23)
Active Member
RE: Prusa Bear Mini Mk3s

Can someone tell me the overall dimensions (without a spool holder but including any room for movement/plugs) that I would need to build an enclosure for on this unit?

Posted : 07/12/2021 5:24 pm
greylock23
(@greylock23)
Active Member
RE: Prusa Bear Mini Mk3s

Does this frame allow you to use the original z height? I also am not interested in getting more height. I only want the ability to make the chassis stiff and put on a direct drive extruder.

Posted by: @jmac

Thanks guys for all your hard work

This looks a great mod.

A few questions if anyone can help please?

I'm going to order the specific mini bear upgrade kit from aliexpress from blurolls.

I want to use my current mini Z and smooth rods as i'm not bothered about gaining for height from Z, so will print out the stuff kindly provided by tompson for that.

I will order a new official Z motor from prusa.

Do I need to order new belts for X and Y and new bearings etc?

What is a good new entire hotend with direct drive to get? one from aliexpress or?

This new direct drive hotend will fit on the mini X smooth rods and belts?

I just want to make sure I get everything ordered at once as the postage costs are very high.

 

here is what i currently have, any help with what i still need please, hotend etc, can i get the hotend from some other company or?

 

Posted by: @tomson

@3dpgva

Hi again. Yes the stoplimit i found out yesterday than i did the wizard. I put some temporary limits but i think i put them 1-2mm to high. I was to exited to start printing so i save that for today:) 

 

Posted by: @pear3d-ch

@firstlayer

Hello there, can you show a picture of printed part and the profile, and we changed the name to pear3D now 😀

 

 

Posted : 07/12/2021 6:14 pm
jmac
 jmac
(@jmac)
RE: Prusa Bear Mini Mk3s

Yes this is standard height, you can use the original mini Z or a mk3s Z, 

You could probably also cut the Z extrusion to lower it say 10 or 20 mm ? going by pictures on tomson and pear3d.ch

 

 

Posted : 07/12/2021 6:28 pm
Tomson
(@tomson)
Trusted Member
RE: Prusa Bear Mini Mk3s

Yes. You can use OEM MINI Z-height. It´s 20mm lower than my extrusions bec. i use OEM Mk3 bear height on Z but it´s no problem to use full Z-height from the MINI and it´s very stiff so it´s no problem to use direct drive. I do not use the full length for printing but only use it as an extension for filament feeder and led-light

Posted : 07/12/2021 6:30 pm
pear3d.ch liked
jmac
 jmac
(@jmac)
RE: Prusa Bear Mini Mk3s

i can't wait to put a filament roll on top of the frame like the mk3s+ 🤣 

The little things in life make me happy 😌 

Posted : 07/12/2021 6:38 pm
Tomson
(@tomson)
Trusted Member
RE: Prusa Bear Mini Mk3s

I understand what you mean😊 most of my print fits the MINI and i prefer to print on them before my mk3s. Some of it bec. of the meny with 32bit but everything feels better and smoother.

Posted : 07/12/2021 10:45 pm
jmac liked
jmac
 jmac
(@jmac)
RE: Prusa Bear Mini Mk3s

Yes for sure I love the 32bit and the fancy screen.

One thing i just can't get right on the mini no matter what I do is PETG, I have tried all sorts but it always strings and blobs, the same PETG prints beautifully on the mk3s+,  I'm hoping when I do the mini bear upgrade and add the mk3s+ full hotend to it that it will print PETG like a mk3s+.

Did you ever have trouble with petg on the standard setup mini?

 

 

Posted : 07/12/2021 10:49 pm
Tomson
(@tomson)
Trusted Member
RE: Prusa Bear Mini Mk3s

No PETG was never a problem, shore it prints better and nicer now but not really a problem. I had most problem with some silk PLA like Extrudr. Most of the problem i ever had both OEM and with Bear-kit have bin heat-creep sometimes. Better with Bear-kit and totally gone after the hurricane build. Same with sag after printing in enclosure in high temp for a while i have had sag on the Super Pinda mount. That is also gone after the Hurricane. I have a M3 skrew mounted next to the Super Pinda to not let any sag of the mount.

Posted : 07/12/2021 11:06 pm
jmac liked
jmac
 jmac
(@jmac)
RE: Prusa Bear Mini Mk3s

And when you did petg on your original stock mini, did you change retraction or speeds etc or just all default settings?

 

 

Posted : 07/12/2021 11:08 pm
jmac
 jmac
(@jmac)
RE: Prusa Bear Mini Mk3s

hi guys

What is the "Smooth rod - Special" part for? how does it differ?

Thanks

 

 

Posted : 09/12/2021 9:20 pm
BogdanH
(@bogdanh)
Honorable Member
RE: Prusa Bear Mini Mk3s

What is the "Smooth rod - Special" part for? how does it differ?

-it doesn't. I guess they call it special in china if it's round enough 😉 

[Mini+] [MK3S+BEAR]...
Posted : 09/12/2021 9:27 pm
jmac liked
jmac
 jmac
(@jmac)
RE: Prusa Bear Mini Mk3s

hah, no I mean between these:

 

Posted : 09/12/2021 9:29 pm
jmac
 jmac
(@jmac)
RE: Prusa Bear Mini Mk3s

hah, no I mean between these:

 

Posted : 09/12/2021 9:29 pm
BogdanH
(@bogdanh)
Honorable Member
RE: Prusa Bear Mini Mk3s

ah, sorry... I though you were talking about rods (as parts).

I'm not familiar with Mini BEAR... maybe "special" means different rod diameter? I think you'll need to download both stl versions and look for differences in CAD software.

[Mini+] [MK3S+BEAR]...
Posted : 09/12/2021 9:34 pm
jmac liked
jmac
 jmac
(@jmac)
RE: Prusa Bear Mini Mk3s

i printed both, diameter is same. @tomson or @pear3d.cd will let us know soon 🙂

Posted : 09/12/2021 9:35 pm
BogdanH
(@bogdanh)
Honorable Member
RE: Prusa Bear Mini Mk3s

can you give the link to all printable parts (stl files)?

[Mini+] [MK3S+BEAR]...
Posted : 09/12/2021 9:37 pm
jmac
 jmac
(@jmac)
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