August 17, 2018 at 12:53 am #66671
I have to print a new roller-part 25mm. I can notice a small difference between the two versions Roller and RollerM, but what’s the purpose of this difference?
I was wondering, would it help for the perpendicularity of the middle tubes to make two bearings on the outside instead of one?
JackAugust 17, 2018 at 10:10 am #66700
The RollerM is a mirror of Roller. They form left and right.
1 user thanked author for this post.August 17, 2018 at 11:37 am #66724
I know it’s a mirrored part. But why it is mirrored? You could use the same part 4 times, I think..?August 17, 2018 at 11:51 am #66727
It will work if your prints are decent.
The reason for the angle is print-ability. Some printers can’t do that angle well, so there is a mirrored version.
The mirrored version is to prevent the gantry from twisting with cruddy prints. If the angle is on the same side of the rail there is no twist, if it is on opposite sides there is 2x’s the twist (print error).
I have a blurb about it in the FAQ’s
1 user thanked author for this post.August 22, 2018 at 12:06 pm #67083
Earlier this post, I was wondering, would it help for the perpendicularity of the middle tubes to make two bearings on the outside instead of one?
Did the test with a sixth bearing on the roller-part. My X-Y axis are 105 x 85 cm and this long axis where quite instable in horizontal direction and hard to get perpendicular.
This extra bearing appears to be a huge improvement. If moving a roller by hand at one side, the opposite roller now moves right along with it. And the the middle is permanent perpendicular, the X-Y configuration has stiff corners. Test passed!
Attachments:August 24, 2018 at 12:29 am #67256
Do you have a link to this part in thingiverse? I’d be interested in seeing what it adds to the mix.August 24, 2018 at 12:41 am #67257
It’s for 25 mm tube. No need for mirrored part. Prints without support. Layer 0,2 and 70% infill. There’s a small solid built in as support that is easy to remove after printing.August 24, 2018 at 4:15 am #67262
Looks like I’ll need to redraw it if I want to use it. I missed the 25mm part…August 24, 2018 at 4:21 am #67263
I don’t understand. This is the 25 mm roller-part…August 24, 2018 at 4:45 am #67266
Right. I’m using emt. I think it’s a 23.4 so I would need to change it slightly.August 31, 2018 at 6:31 pm #67963
I’ve noticed there is an orange slice void in both the roller and rollerM part for the 23.5mm version. Suspect it doesn’t hurt anything, but sense it really shouldn’t be there.August 31, 2018 at 6:39 pm #67964
No worries, artifact of a modification.August 31, 2018 at 11:13 pm #67995
So if I understand, the 45 degree angles in Roller and RollerM are stricly to minimise overhang so that these parts can be printed without support. Is that correct?
They do print amazingly well without support.
1 user thanked author for this post.September 1, 2018 at 7:04 am #68005
Yup. Support is lame (when it can be avoided).September 21, 2018 at 4:36 pm #69920
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